.BenRush - Interacting with script on the MasterPage from the ContentPage

Wednesday, April 04, 2007

Interacting with script on the MasterPage from the ContentPage

Say you have a master page and content page scenario, and from the content page you want to interact with DOM elements described from the master page (for example, the main body element). This is how I do it:

First, add the following attributes to your body element so that it is included in the server-side runtime and can be interacted with from there:

<body id="mainbody" runat="Server">

...notice how the body element now has an id and has the runat="server" attribute set.

Second, from code within the content page (I'm doing it in Page_Load) add code like this:

    protected void Page_Load(object sender, EventArgs e)
    {
        HtmlGenericControl ctrl = (HtmlGenericControl)this.Master.FindControl("mainbody");
        ctrl.Attributes.Add("onload", "alert('hello');");
        return;
    }

The key here is to now grab the body element, add some script to it, and then let it all run as normal. When I run the solution, the content page is loaded, its Page_Load called, the script injected into the body element (of the master page) and I see "hello".

Recommended reading:

Tuesday, April 03, 2007 11:47:56 PM (Central Standard Time, UTC-06:00)

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Thursday, April 19, 2007 3:32:25 PM (Central Standard Time, UTC-06:00)

I don't believe this code works, at least it doesn't for me. The object this.Master does not exist in my user control. Any suggestions?

Rick

Rick Boarman | rboarmanAT NOSPAMdovebid dot com

Thursday, April 19, 2007 6:43:50 PM (Central Standard Time, UTC-06:00)

Hi Rick. Email me at ben AT sideshowsystems dot com with your sample code and I can take a look at it. I can't think of any reason this wouldn't work, but if it does then I would be happen to update the blog to reflect any mistakes I may have made.

Ben

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