Refresh of CellTable via data transmitted via WebSocket delayed
I have a somewhat complex problem related to a CellTable that updates based on messages received over a WebSocket connection. The problem is as follows: The table does not update in real-time, even though "setRowData" and redraw* are called in real-time. There is a delay in the row appearing in the CellTable, or rather in the DOM as a table row. I realize that redraw does not actually redraw but sets a flag via HasDataPresenter.redraw, which checked elsewhere. It is often the case that mouse movement causes the row to appear - and I have been able to reproduce this behavior. When I put in a timer firing every 300 milliseconds, its execution also causes the row to appear. It is flummoxing because the problem did not occur until I switched from a prototype implementation of basic websockets to a prototype implementation of STOMP-wrapped websockets (stomp being a MOM-supported protocol for supported messaging from "simple clients"). However, in both cases, there is no difference as to when the data is delivered via setData and redraw is called, so the change should not affect how or when the cellTable gets updated. I am considering eliminating the use of CellTable and have a simpler DOM manipulation, but I'd prefer to determine what I am doing that is causing this problem, whether it is misuse of CellTable API or inappropriate expectations of CellTable behavior. I can't really post any code because it is all integrated, and I can kind of work around it. Does anyone have any ideas how to approach this problem or where I might begin to look for a solution? Sincerely, Kay -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
Re: JSON to Client Side GWT JavaScriptObject
Thank you very much! I just can't believe I missed that. On Thursday, September 22, 2016 at 11:10:15 AM UTC-4, Jens wrote: > > Missing "return" statement in your JSNI method. Because you returned > nothing, the method returns null automatically. > > Also you can use > > ServerResponseJson resp = JsonUtils.safeEvel(jsonString); > > which is safer than using JS eval() directly. > > -- J. > -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
Re: chrome 53 styleSheet insertRule not working
I solved it by not storing the sheet in a gwt JavaScriptObject field but always get it with a native js method: styleElement.sheet. -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
Re: JSON to Client Side GWT JavaScriptObject
Missing "return" statement in your JSNI method. Because you returned nothing, the method returns null automatically. Also you can use ServerResponseJson resp = JsonUtils.safeEvel(jsonString); which is safer than using JS eval() directly. -- J. -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
JSON to Client Side GWT JavaScriptObject
I'm looking for help in converting a JSON to an instance of a POJO with
embedded objects, on the GWT client side. I'm partially successful but
unable to convert every piece of the JSON I have.
I have removed all but one working piece of code here to narrow down to the
problem area. Specifically, my question is why the following method returns
null?
public final native JsonArray getServerStatusCodeMap() /*-{
// debugger shows serverStatusCodeMap is valid below
this.serverStatusCodeMap;
}-*/;
The JSON is valid (given below) and I have provided all the relevant code
in this post. I would greatly appreciate any help.
Here's the JSON:
{
"idOfSavedObject": "AVc-CQ4OI-SZQb7PIPb_",
"serverStatusCodeMap": [
{
"name": "AVc-CTACI-SZQb7PIPcO",
"value": 202
},
{
"name": "AVc-CTACI-SZQb7PIPcP",
"value": 100
}
]}
Its JS overlay class is
public class ServerResponseJson extends JavaScriptObject {
protected ServerResponseJson() {}
public static final native ServerResponseJson build(String json) /*-{
return eval('(' + json + ')');
}-*/;
public final native String getIdOfSavedObject() /*-{
return this.idOfSavedObject;
}-*/;
public final native JsonArray getServerStatusCodeMap() /*-{
this.serverStatusCodeMap;
}-*/;}
I debugged and found the method below has the right values
public final native JsonArray getServerStatusCodeMap() /*-{
this.serverStatusCodeMap; // this attribute has the right value, the caller
of this method gets a null
}-*/;
[image: Screen clip showing the right values for serverStatusCodeMap]
JsonArray.java
public class JsonArray extends JavaScriptObject {
protected JsonArray() {}
public final native int length() /*-{
return this.length;
}-*/;
public final native E get(int i) /*-{
return this[i];
}-*/;}
the NameNumberJson.java
public class NameNumberJson extends JavaScriptObject {
protected NameNumberJson() {}
public static final native NameNumberJson buildNameNumberJson(String json)
/*-{
return eval('(' + json + ')');
}-*/;
// Return the whole JSON array, as is
public static final native JsonArray
getNameNumberJsons(String json) /*-{
return eval('(' + json + ')');
}-*/;
public final native String getName() /*-{
return this.name;
}-*/;
public final native int getValue() /*-{
return this.value;
}-*/;}
--
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Re: Update conversation by displaying new messages when they are sent
I will repeat myself : I would look into Athmosphere. This is a wrapper around websockets so you don't have to do the bear bones stuff yourself. And they talk about GWT on their Github page : https://github.com/Atmosphere/atmosphere-extensions/wiki/Atmosphere-GWT I used SignalR which is also a wrapper around Websockets, and falls automatic back to other stuff if it fails. No GWT support though so I wrote my own wrapper in about a day. Another problem for you probably is that SignalR needs an IIS server. Whatever you do : don't use timers ! -- You received this message because you are subscribed to the Google Groups "GWT Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to google-web-toolkit+unsubscr...@googlegroups.com. To post to this group, send email to google-web-toolkit@googlegroups.com. Visit this group at https://groups.google.com/group/google-web-toolkit. For more options, visit https://groups.google.com/d/optout.
