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https://issues.apache.org/jira/browse/OFBIZ-11409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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James Yong updated OFBIZ-11409:
-------------------------------
Attachment: OFBIZ-11409.patch
> POC for Dynamic Screen Using MVVM
> ---------------------------------
>
> Key: OFBIZ-11409
> URL: https://issues.apache.org/jira/browse/OFBIZ-11409
> Project: OFBiz
> Issue Type: Improvement
> Components: base
> Affects Versions: Trunk
> Reporter: James Yong
> Assignee: James Yong
> Priority: Minor
> Fix For: Trunk
>
> Attachments: OFBIZ-11409.patch, OFBIZ-11409.patch, OFBIZ-11409.patch,
> OFBIZ-11409.patch
>
>
> Proof of concept for Model–view–viewmodel (MVVM) in form widgets.
> Added data-bind attribute to the field, form and grid tag.
> Example 1:
> Go to [https://localhost:8443/humanres/control/NewEmployee] and try the
> following field:
> # First name
> # Middle name
> # Last name
> Added Full Name field to demonstrate computed observable/property.
> Example 2:
> Page at
> [https://localhost:8443/ordermgr/control/ListQuoteItemsDemo?quoteId=CQ0001]
> duplicated the functionality of Quote Items page, but done using data-binding
> way.
> mbrohl: here is a link to the discussion on the dev mailing list:
> [https://lists.apache.org/thread.html/r1cddbc8041e5a6559bfad979bc8570581a3d1f662a0f8692c7ee9e59%40%3Cdev.ofbiz.apache.org%3E]
> *15th March 2020*
> Updated the patch with more concrete examples for form and grid.
> 1) A javascript viewmodel function will be generated for the form / grid
> widgets when its data-bind attribute is defined.
> 2) First row of the grid is generated by the ofbiz renderer at the server
> side. Subsequent rows will be generated by knockout at the browser side.
> 3) Naming convention of the viewmodel is Vm<Name of Form or Grid>. There is a
> viewmodel for the Grid widget at row level; naming convention is RowVm<Name
> of Grid>.
> 4) Viewmodel can be extended. See the *.js.ftl files in the patch.
> 5) The following javascript files are used:
> * big/big.js - for basic mathematics operation
> * knockout/knockout-3.5.1.js - knockout library
> * knockout/knockout-config.js - extending the library and some code to
> configure knockout-secure-binding
> * knockout/knockout-secure-binding - allow knockout js to be used with a
> Content Security Policy that disables eval and new Function.
> 6) Example of hyperlink:
> Before:
> {code:xml}
> <field name="quoteItemSeqId" title="${uiLabelMap.OrderOrderQuoteItemSeqId}"
> widget-style="buttontext" use-when="${groovy: 'N'.equals(isPromo)}">
> <hyperlink description="${quoteItemSeqId}" target="EditQuoteItem"
> also-hidden="false">
> <parameter param-name="quoteId"/>
> <parameter param-name="quoteItemSeqId"/>
> </hyperlink>
> </field>
> {code}
> After:
> {code:xml}
> <field name="quoteItemSeqId" title="${uiLabelMap.OrderOrderQuoteItemSeqId}"
> data-bind="text:quoteItemSeqId, attr: { href:
> editQuoteItemLink, title: 'Quote Item Seq ID'}"
> widget-style="buttontext">
> <hyperlink description="[placeholder]"/>
> </field>
> {code}
> {code:javascript}
> RowVmListQuoteItemsDemo.prototype = {
> computed: {
> "editQuoteItemLink": function(){
> return "<@ofbizUrl>EditQuoteItem?</@ofbizUrl>"eItemSeqId=" +
> this.quoteItemSeqId() + ""eId=" + this.quoteId();
> },
> ...
> };
> {code}
> From the value of data-bind attribute, we can see that the href attribute
> points to the editQuoteItemLink function.
> editQuoteItemLink is a prototype member of RowVmListQuoteItemsDemo, while
> RowVmListQuoteItemsDemo is viewmodel for the Grid widget at row level.
> 7) Example of decimal places:
> {code:javascript}
> extend: {
> "quoteUnitPrice": {numeric: 2}
> }
> {code}
> The column or field for qouteUnitPrice will be rounded to 2 decimal places.
> 8) Example of calculating line totals:
> {code:xml}
> <field name="lineTotal" title="Line Total (Demo)" ><display/></field>
> {code}
> {code:javascript}
> RowVmListQuoteItemsDemo.prototype = {
> computed: {
> ...
> "lineTotal": function() {
> var itemPrice = this.quoteUnitPrice();
> var selectedAmount = this.selectedAmount() || 1;
> var quantity = this.quantity() || 0;
> return new
> Big(itemPrice).times(selectedAmount).times(quantity).toFixed(2);
> }
> ...
> };
> {code}
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