asp.net - How to control usercontrol from javascript -

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I have a user control with an attribute targetUrl; I add control to this user on one page and below this page Like the targetUrl attribute I type:

It worked correctly, but I want to change the targetUrl attribute with javascript. And I can not do this, I write a code like the one below but it does not work. 

  var frm = document.getElementById ('Modal1'); Frm.targetUrl = 'pop_adres_giris.aspx';

How can I do this?

User control object, which generates HTML on the client side, is not available as rich objects Which are available on handling server-side calls.

Depending on what UserControl is, you must use a different method to achieve it "TargetUrl".

In addition, you want to easily access the elements inside the Dome, you may want to consider using a library such as jQuery or prototype

For example, If you were using ASP: hyperlink control: 

  & lt; Div id = "hyperlink_holder" & gt; & Lt; Asp: hyperlink ... navigate = url = "http: // someurl" /> & Lt; / Div & gt;

You know that ASP: hyperlink HTML like & lt; Generates a href = "http: // someurl" ... />

Then we can access the element and change the link like this: 

  $ ('# hyperlink_holder a'). Attr ("href", "http: // newurl"); Also, keep in mind that the IDs that you give an item in ASP.NET are not necessarily an ID that is presented in HTML in the IT element; Instead it is a combination of many IDs; Therefore, use selectors based on non-run = "server" controls, or pass ClientID of UserControl through a customer to use for selection if necessary.

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