Re: Problems with ClickEvents when using CellTree within DataGrid.

On Monday, November 14, 2016 at 11:06:19 AM UTC+1, Thomas Broyer wrote:

On Monday, November 14, 2016 at 10:51:35 AM UTC+1, magnus....@raybased.com wrote:

I have some problems when using a CellTree within a DataGrid.

Everything works except when clicking on the tree, nothing happens.

I would expect the tree to expand/retract.

Does anyone know of a solution ?

[…] 

    private void buildCell(Node rowValue, String cellStyles, TableRowBuilder row) {

        NodesTree hw = new NodesTree(rowValue);

        TableCellBuilder td = row.startTD().colSpan(5);

        td.className(cellStyles);

        DivBuilder div = td.startDiv();

        String t = hw.getWidget().getElement().getInnerHTML();

First, widgets' event wiring is done in such a way that they need to be "attached" for the events to actually be listened to; see https://github.com/gwtproject/old_google_code_wiki/blob/master/DomEventsAndMemoryLeaks.wiki.md for an oldish explanation.

Second, even if that wasn't the case, you couldn't expect event handlers to be preserved when "serializing" the widget's element to HTML and then re-parse it (moreover, you're taking the innerHTML of the element here, which excludes the element itself, therefore would have excluded all event handlers set on the element, *if* serialization would have preserved them, which is not the case)

So, sorry, but that's not going to work.

It might be possible hacking around: generate placeholder elements in buildCell and schedule a task that will "attach" the CellTree to the placeholder element; each time the cell is re-rendered.

Thank you for the reply. I would like to try your hack. Which class could i use as a placeholder ?

Do you have some example-code to do that ? (I am not an expert of GWT)... 

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