从C＃中的代码隐藏中调用Javascript函数

Question

I have a javascript function in the External JS File. I want to call it from the co0de behind. How can I do that ? I read somewhere that I can do from ScriptManager.RegisterStartupScript but how, can anyone explain me.

JS File:

    Function1()
    {
      alert("came");
     //Some More logic
    }

Update

Calling from

//Tried this But NOT WORKING
 protected void Page_PreRender(object sender, EventArgs e)
 {
      ScriptManager.RegisterStartupScript(this, GetType(), "Function1", "Function1();", true);
     Page.ClientScript.RegisterStartupScript(GetType(), "Function1", "Function1()", true);

 }

Answer 1

I've often used this

string script = string.Format("alert('{0}');",alert);
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "Alert", script, true);

basically, it just inserts that line onto your page and runs it as soon as the page loads

Answer 2

you can try

ClientScript.RegisterStartupScript(GetType(),"CallMyFunction","Function1();",true);

OR

ClientScript.RegisterStartupScript(this,this.GetType(),"CallMyFunction",
                                     "Function1();",true);

another approach is

ScriptManager.RegisterStartupScript(Page, typeof(Page), "somekey", script, true);

this will works during partial postbacks also.

Answer 3

To strictly answer your question you are looking for something like this:

//Following statement is used to call pre-defined javascript function
protected void btnServerSide_Click(object sender, EventArgs e)
{
    ScriptManager.RegisterStartupScript(this, GetType(), "myFunction", "myFunction();", true);            
}

Here is a site that provides some more details and examples

MSDN also has a great walkthrough with multiple examples

This is my favorite of the walkthroughs listed above, it is very comprehensive

Answer 4

sample code, which will include javascript file and then call method from the code behind.

MyJSFile.js

function Test() {
    alert("hi");
}

WebForm1.aspx.cs -

 using System;
using System.Web.UI;
using System.Web.UI.HtmlControls;

namespace CodeprojectTest
{
    public partial class WebForm1 : Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            var js = new HtmlGenericControl("script");
            js.Attributes["type"] = "text/javascript";
            js.Attributes["src"] = "JScript1.js";
            Page.Header.Controls.Add(js);
            Page.ClientScript.RegisterStartupScript(this.GetType(), "myScript", "Test();", true);
        }
    }
}

Answer 5

您可以试试这个。

Page.ClientScript.RegisterClientScriptBlock(typeof(Page), "CallMyFunction", "myFunction()", true);