How to call java script from C# code?

Question 1

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);

Question 2

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.)

Question 3

Look into your browser console and tell us if you got any errors.

Question 4

what are you actually doing in the enable.js and are you able to see any error..?

Question 5

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

Question 6

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

Question 7

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.

Question 8

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')");

Question 9

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>");

RockOnGom RockOnGomRockOnGom 3,9618 gold badges38 silver badges53 bronze badges · Answer 1 · 2013-02-22 09:58:00Z

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

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

score 2 · Answer 2 · 2013-02-22 10:35:08Z

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.

score 0 · Answer 3 · 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')");

Sakthivel SakthivelSakthivel 1,9382 gold badges23 silver badges48 bronze badges · Answer 4 · 2013-02-22 10:34:09Z

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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