Struts2 JQuery网格-空网格消息

Question

I'm using Struts2 JQuery grids and it works fine.

Here is an example of grid:

<s:url var="remoteurl" action="jsontable"/>
    <sjg:grid
        id="gridtable"
        caption="Customer Examples"
        dataType="json"
        href="%{remoteurl}"
        pager="true"
        gridModel="gridModel"
        rowList="10,15,20"
        rowNum="15"
        rownumbers="true"
    >
        <sjg:gridColumn name="id" index="id" title="ID" formatter="integer" sortable="false"/>
        <sjg:gridColumn name="name" index="name" title="Name" sortable="true"/>
        <sjg:gridColumn name="country" index="country" title="Country" sortable="false"/>
        <sjg:gridColumn name="city" index="city" title="City" sortable="false"/>
        <sjg:gridColumn name="creditLimit" index="creditLimit" title="Credit Limit" formatter="currency" sortable="false"/>
    </sjg:grid>

I would like to display a specific message when the grid is empty instead of showing an empty grid. I know that this can be done by encapsulating the whole grid in a s:if statement but I would like to avoid retrieving information twice if the grid has contents (one for the if statement, then a second time for the grid itself).

Is there an option to do the following "isEmpty" message?

<sjg:grid
        id="gridtable"
        ifEmpty="No data to display!"

Or some other mechanism like that where I can display a button to create a new entry?

Answer 1

you can use the event onCompleteTopics and some script like this:

<script type="text/javascript">
$.subscribe('completegrid', function(event, data) {
        var records = $('#gridtable').getGridParam('records');
            if(records < 1) {
                $('#gridcontainer').html('<span>none</span>');
            }
});
</script>

<sjg:grid
        ...
        onCompleteTopics ="completegrid"
        ...
>

See reference on http://code.google.com/p/struts2-jquery/wiki/GridTag#Topics