AJAX and JSP

[newperllearner]

Hi All,

I have a jsp which displays a list read from database. In database, status field is dynamically updated by background thread. I want to display the changed status without refreshing page. So, I am using AJAX. I want to make AJAX request conditionally. I mean if all the statuses on the page are complete, then I don't want to make AJAX call, because there is nothing to update. I want to make AJAX call only if I have status other than complete. From my servlet, I set a flag in a request attribute as true or false dependng on status. In a JSP I get request attribute assign it a js variable. If it's true make AJAX call and I call that function on body onload. It works fine for the first time. But js variable never gets updated even though sevlet updates flag value. How do I address this issue? Calling function on onload will not work.

Any help is appreciated.

Thanks,

[jimfraser]

Lets see the javascript generated by your JSP then

[newperllearner]

function autoUpload() {
     var flag = <%= request.getAttribute("istrue") %>
     if (flag == "true") {
         new Ajax.PeriodicalUpdater('top', 'DisplayList.do', {method:'post',frequency:60,decay:2});
     }
}

[jimfraser]

if (flag == "true")

This is looking for the value of flag to be a string - "true". But you're probably creating a boolean using

var flag = <&#37;= request.getAttribute("istrue") %>

(unless the jsp is adding quotes)

Try:
if (flag) {

instead

[newperllearner]

Yeah. Now, I changed it to null. I mean I'm setting attribute value only if condition is true otherwise it's null. In js my condition looks like this -
if (flag != null)

But, didn't work

[jimfraser]

Try putting an alert inside the condition, just to see if it's working.

[newperllearner]

It doesn't.