How to call javascript function from c#

Question

Hi All,

I like to call a JavaScript function from c#. Can any one can give me code snippet.

More detail...

I have a asp.net page which has a asp button. when i click that button, i like to call javascript function.

like wise....

in my asp.net page,

<button id="save" onclick="i like to call a method resides in asp.net page'>Save</button>

More and more details... when click the asp.net button, i like to perform some server side action and then like to call a javascript function from there itself...

Answer 1

someFunction();

are you serious?

Answer 2

Are you asking about how to execute a .js file on the local machine (i.e. Windows Script Host) or are you talking about doing something to the browser in an ASP.NET application?

Both of these seem a bit odd, to be honest. Be more specific in your question. Give us examples of what you've tried to do. What are you trying to achieve?

Answer 3

You can't "call" a Javascript function from ASP.NET C# code-behind. You can write additional Javascript to the webpage. By the time the page is sent back to the user and the Javascript exists, your code-behind is gone. You can write out to a Literal or do a Response.Write()

Response.Write("<script language='javascript'>alert('Hellow World');</script>");

Answer 4

On the assumption that you're coding in ASP.NET (including MVC), calling a JavaScript function would mean embedding the call in JavaScript into your ASPX code, like so:

<script type="text/javascript">
  doSomething();
</script>

You do have the opportunity to pass information from your C# to the JS call, just as you would have any other code alter the results of your ASPX:

<script type="text/javascript">
  doSomething("<%= GetSomeTextFromCSharp();  %>");
</script>

This is really stretching the definition of "calling JavaScript from C#" though. What you're doing is having your C#/ASPX code generate HTML/JavaScript, which the browser then interprets as it would any other HTML/JS (regardless of how it was generated).

Perhaps you could explain what you're trying to do a bit more.

Answer 5

Sarathi, based on your recent update, it's not clear that you need any C# interaction at all. Your <button> appears to be strictly client-side (ie: HTML) with no ASP.NET interaction within it. To call your JavaScript function you'd attach the function call to the onclick attribute of the button tag:

<button id="save" onclick="mySaveFunction();'>Save</button>

Note that mySaveFunction() just needs to be defined in the browser's load stack for the current page. That means it could be defined in any of:

• The ASPX page that holds the <button>
• The Master page for the current ASPX page
• One of the User controls (or MVC partials) loaded by the current ASPX page
• An external JavaScript file that's loaded by one of the above.

Lastly, I'd just like to reiterate that there's nothing particularly C#/ASP.NET-specific about this. You could do the same with any language/framework, including static HTML files. Your question appears to be entirely JavaScript-dependent.

Answer 6

For an asp:button you use OnClientClick

<asp:Button id="myid" runat="server" OnClientClick="alert('test')" />

Answer 7

For the window object:
http://msdn.microsoft.com/en-us/library/ms536420%28VS.85%29.aspx

window.execScript

For the page pbject:
http://msdn.microsoft.com/en-us/library/dfbt9et1%28v=VS.71%29.aspx

RegisterClientScriptBlock

RegisterOnSubmitStatement

RegisterStartupScript

etc ...

Answer 8

Hi

i tried with this code it works for me check whether it helps

1)

Page.ClientScript.RegisterStartupScript(this.GetType(), "click", "alert('Informations');", true); 

The other way is call the javascript method which is written in source page

Page.ClientScript.RegisterStartupScript(this.GetType(), "click", "xyz();", true);