JavaScript Function Definition in ASP User Control [duplicate]

问题

Possible Duplicate:
User control javascript

I defined a JavaScript function inside a user control.

If I have multiple instances of the user control on my .aspx page, how do I prevent multiple function definitions in the resulting HTML code?

回答1:

You'll want to use the Page.ClientScript manager.

The following code will only register your code once per a page.

if (!page.ClientScript.IsClientScriptBlockRegistered(tType, "MyScript"))
{
     page.ClientScript.RegisterClientScriptBlock(tType, "MyScript", sScript);
}

You can also make sure that *.js files get added only once

if (!page.ClientScript.IsClientScriptIncludeRegistered(tType, "MyScriptFile"))
{
     page.ClientScript.RegisterClientScriptInclude(tType,"MyScriptFile","MyJavaScript.js")
}