Fix IE9 submit events

1 minute read

In my previous blog on how to fix the default type for buttons in IE I ended with a remark that although the method described fixes the button type, in Internet Explorer 9 the save action still does not work. This seems to be IE9 specific, as IE8 works as expected.

After a bit of reverse engineering I found the cause of the problem and came up with a solution.

Looking at the submitted data there is a difference between Firefox and Internet Explorer 9. In IE9 the field $$xspsubmitid is empty, in Firefox it is filled with the id of the server side event that should be triggered (i.e. “view:_id1:_id2:_id7:event1").

At the bottom of the webpage there’s a bit of Javascript code that ‘binds’ the server side event to the click on the button:

XSP.addOnLoad(function() {
XSP.attachEvent("view:_id1:_id2:_id7:event1", "view:_id1:_id2:_id7:button1", "onclick", null, true, 2);
}); ```

The method `attachEvent` calls `XSP.addOnLoad` and that's where funny things happen. This is the method, un-minified from `/domjs/dojo-1.4.3/ibm/xsp/widget/layout/xspClientDojo.js`:

this.addOnLoad=function x_aol(_1b9){ if(!this._listeningForDojoOnload){ this._listeningForDojoOnload=true; dojo.addOnLoad(this,”_loaded”); } this._onLoadListeners.push(_1b9); };```

On the fourth line the dojo.addOnLoad method is called to add a call to XSP’s method _loaded. This method executes the code to add listeners that have been added to the _onLoadListeners array.

Now, what’s all this about? It turns out that IE9 calls the _loaded method immediately after it is added on line 4, before the listener events have been added to the onLoadListeners array. These client side events will never be added, and thus the server side event will not be fired on submit.

The solution? Override the addOnLoad with a slightly modified version and add it somewhere in the current page in a scriptBlock (or Javascript client side library). This modified version fills the onLoadListeners array before adding a call to the _loaded method so that the listeners will always be added, even in IE9.

XSP.addOnLoad=function x_aol(_1b9){ this._onLoadListeners.push(_1b9); if(!this._listeningForDojoOnload){ this._listeningForDojoOnload=true; dojo.addOnLoad(this,"_loaded"); } };

The cause of the problem is probably in Dojo’s addOnLoad. But I expect Dojo’s code to be less easy to fix and settled for this solution.

Game on!

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