Can you please help me with apex variable usage in javascript function.
function viewattachment(expId,contTypeattch,attname){
var def = '{!expBlob[expId]}';
}
expBlob is a Map[Id,Blob]
In the above function, I would like to query this map expBlob of the controller giving the expId. It is taking expId literally and not substituting the actual value of expId from javascript.
That's because '{!expBlob[expId]}' is evaluated at page creation. Instead you have two choices :
Either you Json.serialize your map in your controller
public String expBlobSerialized { get { return Json.serialize(expBlob).escapeEcmaScript(); }}
and then in your page :
<script type="text/javascript">
var expBlob = {!expBlobSerialized};
function viewattachment(expId,contTypeattch,attname){
var def = expBlob['expId'];
}
</script>
Or if your map is too big or you don't want to expose all data in the page, make a webservice and use ajax to retrieve the value you need.
