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Portals and Portlets

executing a javascript function from a servlet

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posted 17 years ago

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I have a portlet that performs a file-upload that uses ajax. The form is in a jsp page and the action executes a servlet and the form also executes a javascript function onsubmit()

<script type="text/javascript">
        <!--
               var updater = null;

function startStatusCheck() {
    		$('submitButton').disabled = true;
    		updater = new Ajax.PeriodicalUpdater('status', '/Profile/Upload', {asynchronous:true, frequency:1, method: 'get', parameters: 'c=status', onFailure: reportError});
    		return true;
  		}

function reportError(request) {
    		$('submitButton').disabled = false;
    		$('status').innerHTML = '<div class="error"><b>Error communicating with server. Please try again.</b></div>';
  		}

function killUpdate(message) {
    		$('submitButton').disabled = false;
    		updater.stop();
    		System.out.println("test function: " + message);
    		if(message != '') {
      			$('status').innerHTML = '<div class="error"><b>Error processing results: ' + message + '</b></div>';
    		}else{
      			new Ajax.Updater('status','/Profile/Upload', {asynchronous:true, method: 'get', parameters: 'c=status', onFailure: reportError});
    		}
  		}   
 //-->
</script>

<form name="form" method="POST" action="/Profile/Upload" ENCTYPE="multipart/form-data" onsubmit="return startStatusCheck();" target="target_upload">
 <input type="hidden" name="pid" value="<%=pid%>"/>
 <input name="profile_pic" size="20" type="file"><br /><br />											
 <input id="submitButton" type="submit"/> 
</form>
<div id="status"></div>

My servlet uploads the file correctly but I need to execute the killUpdate() function in order to stop the update listener, though I don't know how to do it. The example code that I obtained has the function being called like below but this won't work within the portal. Here is a snippet of my servlet that tries to call the javascript function

Any suggestions?

Thanks.

jQuery in Action, 3rd edition

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