Calling Javascript method defined above on page load

Question

I am brand new to JavaScript so bear with me. I have a JavaScript function that is on my page:

<script type="text/javascript">
    Sys.debug = true;
    var popup;
    Sys.require(Sys.components.popup, function () {
        popup = Sys.create.popup("#popup", {
            parentElementID: "target",
        });
    });
</script>

It works perfectly when I use it as an event:

<input type="button" onclick="popup.show()" value="Edit Theme" style="float: right; margin-right: 7.25em;" />

I want to call it on page load, inside the body tag I have the following code:

<script>
    window.onload = popup.show;
</script>

The method does not appear to get called. What am I doing wrong?

I would open up your browsers developer kit to view your JavaScript step by step as it runs on your page. Check the console for error messages, it may lead you directly to the problem. — Lochemage
– Lochemage, Commented Aug 12, 2013 at 18:33
Error message: Uncaught TypeError: Cannot read property 'show' of undefined — David Tunnell
– David Tunnell, Commented Aug 12, 2013 at 18:38
Is this Sys.require ASP.Net script loader? If it is you need to show the pop up when the script has loaded. — RobH
– RobH, Commented Aug 12, 2013 at 18:39

prekolna · Accepted Answer · 2013-08-12 19:07:54Z

2

Based on the documentation on Sys.Require, it seems that Sys.Require is called on load, which means that based on the ASP.Net page lifetime the script hasn't loaded when the onload event fires.

It looks like you can use Sys.onReady() instead:

Sys.onReady(function(){
    popup.show();
})

answered Aug 12, 2013 at 19:07

prekolna

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Aegis · Accepted Answer · 2013-08-12 18:32:03Z

2

You should write:

window.onload = popup.show;

answered Aug 12, 2013 at 18:32

Aegis

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2 Comments

Ivan Chernykh Over a year ago

@DavidTunnell is Sys.require asynchronous?

David Tunnell Over a year ago

I don't know. I used a tutorial to make the inline popup.. I'm looking for it now...

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