Calling ASP method inside javascript code

Question

i wonder if there is any way to call an asp method that returns a string or something when you are in <script></script> tags.

Like this (it does not work):

    <script language="javascript" type="text/javascript">
    function isValid() {
        var required = "<%= callAspMethodThatReturnsSomething() %>";
    }
    </script>

any help with this? thx!

This should work if the method is defined in the code behind. Can you explain what exactly doesn't work? — Oded
– Oded, Commented May 5, 2011 at 9:01
When i run this code, then requiredgives me null. Actually the method is not in codebehind. I am working with masterpages and the method is in the masterpage. So i do Master.Method() in codebehind to get the method... — Ozkan
– Ozkan, Commented May 5, 2011 at 9:03
How does the final rendered HTML look like when you browse the source code? — Darin Dimitrov
– Darin Dimitrov, Commented May 5, 2011 at 9:04
it gives me nothing, the ASP code disappears in javascript like this: var required = ""; — Ozkan
– Ozkan, Commented May 5, 2011 at 9:20

Andrew Orsich · Accepted Answer · 2011-05-05 09:03:55Z

2

There is no direct way to call c# method like in example above. But you can send $.ajax request to the server, or even send postback using _doPostBack(..,..)

answered May 5, 2011 at 9:03

Andrew Orsich

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4 Comments

Oded Over a year ago

The code is within a server side code block <%%>, so it runs server side. Not sure what you are talking about.

Andrew Orsich Over a year ago

@Oded: True, but seems @Ozkan want to execute c# method from client side and not just during page rendering.

Oded Over a year ago

not if he put the server side code in server side code blocks. I think he wants the return value (presumably a string) to be output to the javascript.

Andrew Orsich Over a year ago

@Oded: Yeah, i see, seems your true. I just misunderstand question for first time. Thanks for pointing it out. +1 ;)

Oded · Accepted Answer · 2011-05-05 09:20:14Z

1

The issue is that you are calling a method on the master page from the content page directly.

You can't do that - you need a reference to the strongly typed master page.

Try this (asp.net 4.0):

<%:((MasterPageClassName)Page.Master).callAspMethodThatReturnsSomething()%>

Or this (pre 4.0):

<%=((MasterPageClassName)Page.Master).callAspMethodThatReturnsSomething()%>

answered May 5, 2011 at 9:20

Oded

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Comments

Aaron · Accepted Answer · 2011-05-05 09:14:48Z

0

<% callAspMethodThatReturnsSomething() %>

this method in <% %> will work before what you want to do ,it may looks like does not work

yet,you can create a new button on page ,make it unvisible and use it's click event like document.getElementById("<%=button1.ClientID%>").click()

answered May 5, 2011 at 9:14

Aaron

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