How can I include a JavaScript function in an ASP.NET control?

Incorporating client-side functionality into my user controls is a priority for me right now.

For example, imagine one of the controls includes a hidden field and several checkboxes. Whenever a checkbox is checked, it updates the hidden field to 'YES'. How can I access that control within the parent control or page, and then execute a function to retrieve the value of the hidden field?

If there are multiple instances of these controls on the page, I would like to implement something like this:

var choices1 = $get('choices1_id');
if(choices1.dirty() === 'YES') {
    // Perform certain actions
}
var choices2 = $get('choices2_is');
if(choices2.dirty() === 'YES') {
    // Perform certain actions
}

I am exploring options similar to the approach discussed here: , but I am unsure about how to access the object(s) from the parent.

Thank you, Mark

Answer №1

It seems like the issue you're encountering is that ASP.Net may alter the id of the control, causing confusion.

In such cases, my approach typically involves making a note of how the id gets altered for simpler pages and writing the corresponding javascript code accordingly. For more complex scenarios, I tend to examine each control's .ClientID property and store this information in variables within a custom script for easy access by other javascript on the page.

While accessing every control element from javascript should be easier, this limitation is one of my gripes with the ASP.Net framework. There are some improvements expected in the next version, although there is still room for enhancement. In the meantime, you can explore various web components designed to automate the generation of the aforementioned script.

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