How to call java script from C# code?

Question

I have an Enable.js file that has an Enable() function. I want to call this Enable function from the C# codebehind. My .js file and c# file are in same application.

I have tried this, but it doesn't help me.

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

What happens? Is there a JavaScript error? Is Enabled(true) contained in the response HTML? (Remember, that will only happen on the client after the response is received.) — user166390
– user166390, Commented Feb 22, 2013 at 9:46
Look into your browser console and tell us if you got any errors. — Łukasz W.
– Łukasz W., Commented Feb 22, 2013 at 9:51
what are you actually doing in the enable.js and are you able to see any error..? — Sravan Kumar
– Sravan Kumar, Commented Feb 22, 2013 at 9:59

RockOnGom · Accepted Answer · 2013-02-22 10:10:09Z

2

Try this:

   ScriptManager.RegisterClientScriptInclude(
                this,
                typeof(Page),
                "Enable-js",
                ResolveClientUrl("~/scripts/Enable.js"));


ScriptManager.RegisterStartupScript(
                this, GetType(), Guid.NewGuid().ToString(),
                "Enable(True);", true);

http://msdn.microsoft.com/pt-br/library/bb337005.aspx

edited Feb 22, 2013 at 10:10

answered Feb 22, 2013 at 9:58

RockOnGom

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1 Comment

Sravan Kumar Over a year ago

I think ScriptManager is used only when Ajax controls like Update Panel are used.This may not help.

Rudi Visser · Accepted Answer · 2013-02-22 10:56:24Z

I could see "click" in your code. Hence, I assume that you need to click some button to call Enable(true) function inside Enable.js file

Follow these below steps:

Reference your Enable.js file inside <head> section like below.

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

Enable.js file is given below:
```
function Enable(var){
    alert(val)
}
```

To call on Enable() function on Button1's click event:

protected void Page_Load(object sender, EventArgs e){
    Button1.Attributes.Add("OnClick", "return Enable('true');");
}

Let me know if you need some more help.

Ryan McDonough · Accepted Answer · 2013-02-22 10:06:46Z

I wrote a nice little function for calling jquery or just general JS in C# based on some VB I saw a while ago.

public bool runJQueryCode(string message)
{
    ScriptManager requestSM = ScriptManager.GetCurrent(Page);

    if (requestSM != null && requestSM.IsInAsyncPostBack)
    {
        ScriptManager.RegisterClientScriptBlock(Page, typeof(Page), Guid.NewGuid().ToString(), getjQueryCode(message), true);
    }
    else
    {
        Page.ClientScript.RegisterClientScriptBlock(typeof(Page), Guid.NewGuid().ToString(), getjQueryCode(message), true);
    }

    return true;
}

private string getjQueryCode(string jsCodetoRun)
{
    string x = "";

    x += "$(document).ready(function() {";
    x += jsCodetoRun;
    x += " });";

    return x;
}

So you can just call runJqueryCode("alert('hey')");

Community · Accepted Answer · 2017-05-23 12:12:31Z

You are making a mistake here:

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

The Enable(true) is not possible its literal string true that you're trying to pass as parameter.

You should try this way, so it may help.Its only a sample for understanding

string func = "showSuccessMessage('"+name+"');";
//Pass string as funcion in c#

This Link will explain calling javascript function with parameter from C# Code behind.

this.Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "xx",   
"<script>test("+x+","+y+");</script>");

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