Re: [Wicket-user] DataView (extentions)
Several months ago I mentioned that I was developing classes based on WicketExtensions' DataTable and SortableDataProvider to display arbitrary SQL SELECT result sets, with arbitrary sorting capability built-in. My approachis only appropriate for small result sets or for prototyping, as theResultSet's datais kept in the data provider between page renderings: The developer overrides the method that generates the SQL query string. If the generated text varies from one postback to the next (or if an event sets a special flag), the data is replaced by a new query to the database. A general routine handles sorting events (column-header clicks) by delegating to column type's default comparator and the built-in ArrayList sorting capability. A hook isprovidedwhere thedeveloper canspecify massaging of the databetween download and presentation, e.g.to compute and adda summary row, to insert additional computed columns, or toreplace date or number objectsby formatted strings (to bypass DataTable's default rendering of these objects). (Perhaps someone can adapt some of my ideas to a more general solution that doesn't keep result-set data in the DataProvider between postbacks.) My implementationconsists of just a few hundred lines of code infour classes,two of which are trivial javabeans. A few readers of this group expressed interest; what would be the easiest way of sharing? I suppose I could build a tiny jar file and attach it to an e-mail, but it might be easier to discuss the implementation if I send a few e-mails, each directly containing the source code for one or two classes. Would that be an appropriate use of this mailing list? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vincent JenksSent: Wednesday, March 15, 2006 9:29 AMTo: wicket-user@lists.sourceforge.netSubject: Re: [Wicket-user] DataView (extentions) I'd love to see this (along w/ an example or two on usage) ;) On 3/15/06, Frank Silbermann [EMAIL PROTECTED] wrote: I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet. The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object. Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.) My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist() command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index. My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). It's actually a bit more complicated than that, because sometimes the user needs to add one or more summaryrows or add computed columns. The code is actually quite compact; when I'm finished I'll post it to the list if there is any interest. -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Igor VaynbergSent: Tuesday, March 14, 2006 5:21 PMTo: wicket-user@lists.sourceforge.netSubject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting.-Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work. Something like that would be really convenient. - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] DataView (extentions)
Why don't you create a wiki article on this subject? Martijn On 7/12/06, Frank Silbermann [EMAIL PROTECTED] wrote: Several months ago I mentioned that I was developing classes based on WicketExtensions' DataTable and SortableDataProvider to display arbitrary SQL SELECT result sets, with arbitrary sorting capability built-in. My approach is only appropriate for small result sets or for prototyping, as the ResultSet's data is kept in the data provider between page renderings: The developer overrides the method that generates the SQL query string. If the generated text varies from one postback to the next (or if an event sets a special flag), the data is replaced by a new query to the database. A general routine handles sorting events (column-header clicks) by delegating to column type's default comparator and the built-in ArrayList sorting capability. A hook is provided where the developer can specify massaging of the data between download and presentation, e.g. to compute and add a summary row, to insert additional computed columns, or to replace date or number objects by formatted strings (to bypass DataTable's default rendering of these objects). (Perhaps someone can adapt some of my ideas to a more general solution that doesn't keep result-set data in the DataProvider between postbacks.) My implementation consists of just a few hundred lines of code in four classes, two of which are trivial javabeans. A few readers of this group expressed interest; what would be the easiest way of sharing? I suppose I could build a tiny jar file and attach it to an e-mail, but it might be easier to discuss the implementation if I send a few e-mails, each directly containing the source code for one or two classes. Would that be an appropriate use of this mailing list? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vincent Jenks Sent: Wednesday, March 15, 2006 9:29 AM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) I'd love to see this (along w/ an example or two on usage) ;) On 3/15/06, Frank Silbermann [EMAIL PROTECTED] wrote: I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet. The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object. Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.) My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist() command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index. My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). It's actually a bit more complicated than that, because sometimes the user needs to add one or more summary rows or add computed columns. The code is actually quite compact; when I'm finished I'll post it to the list if there is any interest. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Igor Vaynberg Sent: Tuesday, March 14, 2006 5:21 PM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work. Something like that would be really convenient. - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user -- Download Wicket 1.2 now! Write Ajax applications without touching JavaScript! -- http://wicketframework.org
Re: [Wicket-user] DataView (extentions)
I suppose it could go into: Wicket Wiki // Reference Library How To Do Things in Wicket // Database Interaction -- though it would be much longer than any of the other articles (aside from those which are external links). Also, how would I create the new page into which I could enter my text? (Would I have to submit my words and code as HTML? Embarassing to say, but I don't have much experience with this, or with Wikis ...) -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Martijn Dashorst Sent: Wednesday, July 12, 2006 11:20 AM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) Why don't you create a wiki article on this subject? Martijn On 7/12/06, Frank Silbermann [EMAIL PROTECTED] wrote: Several months ago I mentioned that I was developing classes based on WicketExtensions' DataTable and SortableDataProvider to display arbitrary SQL SELECT result sets, with arbitrary sorting capability built-in. My approach is only appropriate for small result sets or for prototyping, as the ResultSet's data is kept in the data provider between page renderings: The developer overrides the method that generates the SQL query string. If the generated text varies from one postback to the next (or if an event sets a special flag), the data is replaced by a new query to the database. A general routine handles sorting events (column-header clicks) by delegating to column type's default comparator and the built-in ArrayList sorting capability. A hook is provided where the developer can specify massaging of the data between download and presentation, e.g. to compute and add a summary row, to insert additional computed columns, or to replace date or number objects by formatted strings (to bypass DataTable's default rendering of these objects). (Perhaps someone can adapt some of my ideas to a more general solution that doesn't keep result-set data in the DataProvider between postbacks.) My implementation consists of just a few hundred lines of code in four classes, two of which are trivial javabeans. A few readers of this group expressed interest; what would be the easiest way of sharing? I suppose I could build a tiny jar file and attach it to an e-mail, but it might be easier to discuss the implementation if I send a few e-mails, each directly containing the source code for one or two classes. Would that be an appropriate use of this mailing list? From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Vincent Jenks Sent: Wednesday, March 15, 2006 9:29 AM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) I'd love to see this (along w/ an example or two on usage) ;) On 3/15/06, Frank Silbermann [EMAIL PROTECTED] wrote: I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet. The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object. Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.) My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist() command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index. My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). It's actually a bit more complicated than that, because sometimes the user needs to add one or more summary rows or add computed columns. The code is actually quite compact; when I'm finished I'll post it to the list if there is any interest. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Igor Vaynberg Sent: Tuesday, March 14, 2006 5:21 PM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra
Re: [Wicket-user] DataView (extentions)
Hello Frank, I have just begun developing an application using paged tables and IDataProvider. My environment is hibernate with thousands of items to display, so hopefully the laze instantiation will keep memory utilization low. Anyhow, I would like to take a peek at your code. If you don't mind, just tar the directory and attach to a personal email. Thanks, Mike Frank Silbermann wrote: Several months ago I mentioned that I was developing classes based on WicketExtensions' DataTable and SortableDataProvider to display arbitrary SQL SELECT result sets, with arbitrary sorting capability built-in. My approach is only appropriate for small result sets or for prototyping, as the ResultSet's data is kept in the data provider between page renderings: * The developer overrides the method that generates the SQL query string. If the generated text varies from one postback to the next (or if an event sets a special flag), the data is replaced by a new query to the database. * A general routine handles sorting events (column-header clicks) by delegating to column type's default comparator and the built-in ArrayList sorting capability. * A hook is provided where the developer can specify massaging of the data between download and presentation, e.g. to compute and add a summary row, to insert additional computed columns, or to replace date or number objects by formatted strings (to bypass DataTable's default rendering of these objects). (Perhaps someone can adapt some of my ideas to a more general solution that doesn't keep result-set data in the DataProvider between postbacks.) My implementation consists of just a few hundred lines of code in four classes, two of which are trivial javabeans. A few readers of this group expressed interest; what would be the easiest way of sharing? I suppose I could build a tiny jar file and attach it to an e-mail, but it might be easier to discuss the implementation if I send a few e-mails, each directly containing the source code for one or two classes. Would that be an appropriate use of this mailing list? - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] DataView (extentions)
On 12/07/06, Frank Silbermann [EMAIL PROTECTED] wrote: I suppose it could go into: Wicket Wiki // Reference Library How To Do Things in Wicket // Database Interaction -- though it would be much longer than any of the other articles (aside from those which are external links). Also, how would I create the new page into which I could enter my text? (Would I have to submit my words and code as HTML? Embarassing to say, but I don't have much experience with this, or with Wikis ...) Not a problem! You'll need to create yourself an account on the wiki if you've not done so already (top right of any wiki page), then use either the Edit link at the top of the page or the [Edit] link at the top-right of the section to go to edit mode, e.g. the Database Interaction section of the Reference Library page. Create a link by adding a line such as * [[Reading from a Database|How to read from a database]] which is a bulleted item (the *) which links to the Reading from a Database page (although the link text itself is How to read from a database). Names such as * [[DataView Notes]] are fine, though. One you save the page, you'll have a link while will take you to an edit page to create your new page. See http://www.wicket-wiki.org.uk/wiki/index.php/Help:Editing for help on editing, but don't worry about how long it is - you can always go back and split it into multiple pages later on if you want. A very short guide is: == Header One == === Header Two === Header Three * Bullet list ** Bullet sub-list # Numbered list ## Numbered sub-list [[wikilink|linklabel]] [externallink linklabel] ''Emphasize'', '''strongly'''. (italic bold) tttypewriter/tt Use pre and /pre to surround code blocks - leading s will do it but then the block stops at the first empty line, so don't indent normal text... /Gwyn - Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnkkid=120709bid=263057dat=121642 ___ Wicket-user mailing list Wicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
RE: [Wicket-user] DataView (extentions)
The DataTable in Wicket Extensions 1.1 handles paging and sorting, but you must build a custom IDataProvider that accumulates the sorting instructions from the DataTable and provides sorted subsets of the data when requested by the DataTable (which handles the actual paging display). DataTable and supporting classes have been greatly refactored in Wicket Extensions 1.2 to give the user much more flexibility in the set of features desired. The API changes will break Wicket 1.1 programs, so if you need to subclass anything to modify its behavior, I would suggest going to Wicket 1.2 now. Otherwise, you can upgrade fairly easily at any time by replacing Wicket 1.1 DataTable with Wicket 1.2 DefaultDataTable. Wicket 1.2 DataTable is more flexible but less complete; DefaultDataTable subclasses it to provide defaults which make it behave like the Wicket 1.1 DataTable. I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet. The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object. Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.) My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist() command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index. My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). Its actually a bit more complicated than that (and a work in progress), because I have complicated the above mechanisms to deal with the possibility of a summary row at the end, and when rows are requested, the query string will be recalculated based on form data -- and if it has changed since the last request then the data will be refreshed from the database and the current page set back to 1. The code is actually quite compact; when Im finished Ill post it to the list if there is any interest. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Igor Vaynberg Sent: Tuesday, March 14, 2006 5:21 PM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work. Something like that would be really convenient. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: are you using 1.1 ? or 1.2 ? there used to be a constructor that took model in 1.1 i think. the model object must be of type IDataProvider. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor. there are examples of dataview and datatable under wicket-examples/repeaters -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objects from a session bean. I create the List collection (loadingModel) and pass it into the DataView: DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime: Caused by: java.lang.ClassCastException: java.util.ArrayList I assume then, it's not like the ListView in that it will not take a List directly? Or, have I done something wrong? Thanks!
Re: [Wicket-user] DataView (extentions)
I'd love to see this (along w/ an example or two on usage) ;)On 3/15/06, Frank Silbermann [EMAIL PROTECTED] wrote: The DataTable in Wicket Extensions 1.1 handles paging and sorting, but you must build a custom IDataProvider that accumulates the sorting instructions from the DataTable and provides sorted subsets of the data when requested by the DataTable (which handles the actual paging display). DataTable and supporting classes have been greatly refactored in Wicket Extensions 1.2 to give the user much more flexibility in the set of features desired. The API changes will break Wicket 1.1 programs, so if you need to subclass anything to modify its behavior, I would suggest going to Wicket 1.2 now. Otherwise, you can upgrade fairly easily at any time by replacing Wicket 1.1 DataTable with Wicket 1.2 DefaultDataTable. Wicket 1.2 DataTable is more flexible but less complete; DefaultDataTable subclasses it to provide defaults which make it behave like the Wicket 1.1 DataTable. I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet. The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object. Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.) My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist() command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index. My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). It's actually a bit more complicated than that (and a work in progress), because I have complicated the above mechanisms to deal with the possibility of a summary row at the end, and when rows are requested, the query string will be recalculated based on form data -- and if it has changed since the last request then the data will be refreshed from the database and the current page set back to 1. The code is actually quite compact; when I'm finished I'll post it to the list if there is any interest. -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Igor Vaynberg Sent: Tuesday, March 14, 2006 5:21 PM To: wicket-user@lists.sourceforge.net Subject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work. Something like that would be really convenient. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: are you using 1.1 ? or 1.2 ? there used to be a constructor that took model in 1.1 i think. the model object must be of type IDataProvider. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor. there are examples of dataview and datatable under wicket-examples/repeaters -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objects from a session bean. I create the List collection (loadingModel) and pass it into the DataView: DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime: Caused by: java.lang.ClassCastException: java.util.ArrayList I assume then, it's not like the ListView in that it will not take a List directly? Or, have I done something wrong? Thanks!
Re: [Wicket-user] DataView (extentions)
I cant speak for Frank's implementation, but when the IDataProvider is implemented correctly you only retrieve the window of data that will be rendered for this request and hold none of it in session. so the performance of the datatable component itself should be great. -IgorOn 3/15/06, Mats Norén [EMAIL PROTECTED] wrote: That would be great!btw, how is the performance with large resultsets?On 3/15/06, Frank Silbermann [EMAIL PROTECTED] wrote: The DataTable in Wicket Extensions 1.1 handles paging and sorting, but you must build a custom IDataProvider that accumulates the sorting instructions from the DataTable and provides sorted subsets of the data when requested by the DataTable (which handles the actual paging display). DataTable and supporting classes have been greatly refactored in Wicket Extensions 1.2 to give the user much more flexibility in the set of features desired.The API changes will break Wicket 1.1 programs, so if you need to subclass anything to modify its behavior, I would suggest going to Wicket 1.2 now.Otherwise, you can upgrade fairly easily at any time by replacing Wicket 1.1 DataTable with Wicket 1.2 DefaultDataTable.Wicket 1.2 DataTable is more flexible but less complete; DefaultDataTable subclasses it to provide defaults which make it behave like the Wicket 1.1 DataTable. I have come up with my own subclass of DataTable and implementation of IDataProvider to display any arbitrary database java.sql.ResultSet.The basic idea is that my IDataProvider implementation contains a List of rows, each row consisting of a List of Object.Also in the implementation is an array of descriptors, one per column, each of which contains the column name and an indicator as to whether I want to be able to sort on that column. (The column name comes from the ResultSetMetadata; a method is provided to set the sortability flag.)My implementation of the abstract method to deliver a sequence of rows will delegate to the List.sublist () command from the Java Collections API, and each time the DataTable delivers a sort criteria I apply the Collections.sort() method to my list of rows, passing it a Comparator that delegates to the Comparator of the Object at the relevant column index.My implementation of IDataProvider can also look at my array of column descriptors and generate a list of IColumn objects (needed to construct the DataTable). It's actually a bit more complicated than that (and a work in progress), because I have complicated the above mechanisms to deal with the possibility of a summary row at the end, and when rows are requested, the query string will be recalculated based on form data -- and if it has changed since the last request then the data will be refreshed from the database and the current page set back to 1. The code is actually quite compact; when I'm finished I'll post it to the list if there is any interest. -Original Message-From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Igor VaynbergSent: Tuesday, March 14, 2006 5:21 PM To: wicket-user@lists.sourceforge.netSubject: Re: [Wicket-user] DataView (extentions) there is also a DataTable component which wraps DataView+paging+sorting. -Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: I'm using 1.1.1Are there any plans to whittle down the amount of code it takes to implement paging sorting?Has it changed at all in 1.2?I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work.Something like that would be really convenient. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: are you using 1.1 ? or 1.2 ?there used to be a constructor that took model in 1.1 i think. the model object must be of type IDataProvider.-Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters-Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean.I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take a List directly?Or, have I done something wrong?Thanks!--- This SF.Net email is sponsored by xPML, a groundbreaking scripting languagethat extends applications into web and mobile media. Attend the live webcastand join the prime
Re: [Wicket-user] DataView (extentions)
yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters -IgorOn 3/14/06, VGJ [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean.I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take aList directly?Or, have I done something wrong? Thanks!---This SF.Net email is sponsored by xPML, a groundbreaking scripting languagethat extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory!http://sel.as-us.falkag.net/sel?cmdlnkkid0944bid$1720dat1642 ___Wicket-user mailing listWicket-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/wicket-user
Re: [Wicket-user] DataView (extentions)
yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters -IgorOn 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean. I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take aList directly? Or, have I done something wrong? Thanks!
Re: [Wicket-user] DataView (extentions)
Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor.On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote:yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters -IgorOn 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean. I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take aList directly? Or, have I done something wrong? Thanks!
Re: [Wicket-user] DataView (extentions)
are you using 1.1 ? or 1.2 ?there used to be a constructor that took model in 1.1 i think. the model object must be of type IDataProvider.-IgorOn 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor.On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote:yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters -IgorOn 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean. I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take aList directly? Or, have I done something wrong? Thanks!
Re: [Wicket-user] DataView (extentions)
I'm using 1.1.1 Are there any plans to whittle down the amount of code it takes to implement paging sorting? Has it changed at all in 1.2? I spent a lot of time w/ ASP.NET (which wicket feels quite similar to) and there's a DataGrid component that has properties to set paging sorting w/o any extra work. Something like that would be really convenient. On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote: are you using 1.1 ? or 1.2 ?there used to be a constructor that took model in 1.1 i think. the model object must be of type IDataProvider.-Igor On 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: Sorry, I didn't mention that the List is wrapped in a detached modelso it's an IModel, not List in the constructor.On 3/14/06, Igor Vaynberg [EMAIL PROTECTED] wrote:yes DataView works with IDataProvider instead of list. not sure why you didnt get a compile error since there is no (String,List) constructor.there are examples of dataview and datatable under wicket-examples/repeaters -IgorOn 3/14/06, Vincent Jenks [EMAIL PROTECTED] wrote: So, I'm trying to use a DataView so I can page a collection of objectsfrom a session bean. I create the List collection (loadingModel) and pass it into the DataView:DataView productsDataView = new DataView(productsDataView, loadingModel) ...but I'm getting an exception at runtime:Caused by: java.lang.ClassCastException: java.util.ArrayListI assume then, it's not like the ListView in that it will not take aList directly? Or, have I done something wrong? Thanks!
