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Codebehind Call Javascript Funtions Contained in Central js file?

pointeman asked
Medium Priority
Last Modified: 2012-05-06
I would like to be able to call several different javascripts from a central .js file in a central script folder. Looks like a nice tidy way to do.......

protected void Button1_Click(object sender, EventArgs e)
      call ~/script/JScript.js function MessageBoxAlert(textstring)

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Create a javascript file in your project

Reference the file in the head tag of your page/master page

   <script type="text/javascript" src="myjavascript.js"></script>

Call the javascript from anywhere in your code.

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//javascript file
function myAlert() {

//HTML file
<asp:Button OnClientClick="return myAlert();" runat="server" />

//Code Behind if you have a ScriptManager control on your page
ScriptManager.RegisterStartup(this, this.GetType(), "myKey", "myAlert();", true);

//Code Behind if you don't have a ScriptManager
ClientScript.RegisterClientScriptBlock(this.GetType(), "myKey", "myAlert();", true);
You may also do it to add attribute to the Button control during the page load as,
     Button1.Attributes.Add("onclick", "MyFunction();");
To just call a javascript function, you never need to go server-side to do that.
You never NEED to go server-side to call javascript but you may WANT to if you have some C#/VB code that you want to run first.


Okay, placed your example function in my master.js file, then performed drag-n-drop file onto the actual aspx page to obtain correct script file reference link like so. The <script src> located on the master.master page did not work probably because my page is located in another sub directory. Anyway this works...
Q. What does "mykey" refer to?
<asp:Content ID="Content1" ContentPlaceHolderID="ContentPlaceHolder1" runat="Server">
<script src="../scripts/master.js" type="text/javascript"></script>

 --- code ---

protected void Button1_Click1(object sender, EventArgs e)
     ScriptManager.RegisterStartupScript(this, this.GetType(), "myKey", "myAlert();", true);
It is just a reference name given to the script block that you are registering.  Just provide some descriptive name.
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