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POCellTable with custom Header containing SearchBox and Focus Problem
 

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  1. POCellTable with custom Header containing SearchBox and Focus Problem
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    <p>I am trying to implement a CellTable with a custom Column Header which displays a SearchBox (simple Textbox) below the normal Column text.<br>The SearchBox should allow the user to filter the CellTable. It should look something like this:</p> <pre><code> |Header 1|Header 2 | |SEARCHBOX|SEARCHBOX| ------------------------------------------------------- | ROW 1 ------------------------------------------------------ | ROW 2 </code></pre> <p>As soon as the user types in a character into the SearchBox a <strong>RangeChangeEvent</strong> is fired which leads to a server requests and the CellTable is updated with the new filtered list.<br><br> Basically everything works fine. However as soon as the CellTable is refreshed the SearchBox <strong>loses its focus</strong> and the user has to click with the mouse into the SearchBox again to type in a new character.<br> <br>This is probably related to the fact that the render method of the custom header and its cell is called after the CellTable refresh.<br>Is there any way how to set the focus back to the SearchBox? I tried to set <strong>tabindex=0</strong> but it didn't help.<br><br></p> <h2>Custom Header Class</h2> <pre><code>public static class SearchHeader extends Header&lt;SearchTerm&gt; { @Override public void render(Context context, SafeHtmlBuilder sb) { super.render(context, sb); } private SearchTerm searchTerm; public SearchHeader(SearchTerm searchTerm,ValueUpdater&lt;SearchTerm&gt; valueUpdater) { super(new SearchCell()); setUpdater(valueUpdater); this.searchTerm = searchTerm; } @Override public SearchTerm getValue() { return searchTerm; } } </code></pre> <h2>Custom Search Cell (used in the custom Header)</h2> <p>The <strong>isChanged</strong> boolean flag is set to <strong>true</strong> when the user types something into the SearchBox and is set back to <strong>false</strong> if the SearchBox loses its focus. I added this flag in order to distinguish which SearchBox gets the focus (in case I use multiple SearchBoxes)</p> <pre><code>public static class SearchCell extends AbstractCell&lt;SearchTerm&gt; { interface Template extends SafeHtmlTemplates { @Template("&lt;div style=\"\"&gt;{0}&lt;/div&gt;") SafeHtml header(String columnName); @Template("&lt;div style=\"\"&gt;&lt;input type=\"text\" value=\"{0}\"/&gt;&lt;/div&gt;") SafeHtml input(String value); } private static Template template; private boolean isChanged = false; public SearchCell() { super("keydown","keyup","change","blur"); if (template == null) { template = GWT.create(Template.class); } } @Override public void render(com.google.gwt.cell.client.Cell.Context context, SearchTerm value, SafeHtmlBuilder sb) { sb.append(template.header(value.getCriteria().toString())); sb.append(template.input(value.getValue())); } @Override public void onBrowserEvent(Context context,Element parent, SearchTerm value,NativeEvent event,ValueUpdater&lt;SearchTerm&gt; valueUpdater) { if (value == null) return; super.onBrowserEvent(context, parent, value, event, valueUpdater); if ("keyup".equals(event.getType())) { isChanged = true; InputElement elem = getInputElement(parent); value.setValue(elem.getValue()); if (valueUpdater != null) valueUpdater.update(value); } else if ("blur".equals(event.getType())) { isChanged =false; } } protected InputElement getInputElement(Element parent) { Element elem = parent.getElementsByTagName("input").getItem(0); assert(elem.getClass() == InputElement.class); return elem.cast(); } } </code></pre> <h2>Init Code for the CellTable</h2> <p><strong>NameColumn</strong> is the implementation of the abstract <strong>Column</strong> class with the appropriate types. It uses a <strong>TextCell</strong> internally. </p> <pre><code>ValueUpdater&lt;SearchTerm&gt; searchUpdater = new ValueUpdater&lt;SearchTerm&gt;() { @Override public void update(AccessionCellTableColumns.SearchTerm value) { // fires a server request to return the new filtered list RangeChangeEvent.fire(table, new Range(table.getPageStart(), table.getPageSize())); } }; table.addColumn(new NameColumn(searchTerm),new SearchHeader(searchTerm,searchUpdater)); </code></pre>
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    1. USÜmit
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      1. POCellTable with custom Header containing SearchBox and Focus Problem
      1. USAndrea Boscolo
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      1. USMatthew Sowders
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    1. COAny solution to this problem?
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      1. USSteve J
    2. COWell I ended up solving this by adding separate SearchBoxes **above** the CellTable-Header and using CSS to align them to the Header. However I think GWT 2.4 added some new features regarding CellTable/DataGrid which might enable to solve it the original way.
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      1. USÜmit
    3. COwhat happens if you put focus="true" attribute on those search boxes?
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      1. USmilan
 

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