Display message on gridPagingToolbar based on restDataStore length

Question

I am new to jsp / servlet and related domains. I am trying to display a message on a gridPagingToolbar based on length of myDataStoreDs.

<j:gridPagingToolbar dataStoreId="myDataStoreDs" gridId="myExampleGrid" exportEnabled="true">
        <jsp:attribute name="startItems">
            myLib.Util.removeNulls([null, "${message}"            
                ,   <j:button type='edit' labelKey="myLabel" handler="myHandler" hidden="true" itemId="myBtn"/>            
            ])
        </jsp:attribute>
</j:gridPagingToolbar>

The variable "message" should have a String based upon the length of the datastore - such as null for datastore length 0, some custom message otherwise. I should do this check on my html.jsp, and the datastore is being populated by a rest POST through a js.jsp.

Any suggestions on the code to read the datastore length and populate the message? I have used

<c:if test="someRequestAttribute"> 

for other purposes, but not able to get the correct way to implement this one.

Answer 1

I figured it out.

<j:gridPagingToolbar dataStoreId="myDataStoreDs" gridId="myExampleGrid" exportEnabled="true">
        <jsp:attribute name="startItems">
            myLib.Util.removeNulls([null
                ,   {
                    xtype: 'tbtext',
                    itemId: 'toolbarText',                       
                    text: "<j:jsMessage key='diplay text' bundle='bundle.myResourceBundle' />"

                }                
                ,   <j:button type='edit' labelKey="myLabel" handler="myHandler" hidden="true" itemId="myBtn"/>            
        ])
        </jsp:attribute>
</j:gridPagingToolbar>

In the js.jsp part, the rest datastore length can be checked.

var text = pageConfigName.myExampleGrid.down("#toolbarText");    
if(pageConfigName.myDatastoreDs.getTotalCount() == 0) {                                         
            text.hidden = true;
    }