Calling a JavaScript method in C# button Click Event using ClientScript

Question

0.00/5 (No votes)

See more:

Can anyone give me a detailed explanation or resource regarding what happens when calling a
java-script function using Client-Script, inside an asp.net button click event. And my problem is if I call a java-script function from the 1st line, event won't stop and populate the java-script function. Instead it'll go through the whole C# code and then populate the java-script function.

Ex:

C#

<script type="text/javascript">
        function ShowPopUp() {
            var result = confirm("Do you want to proceed? ");
            alert(result);
        }
    </script>

C#

protected void btnClick_Click(object sender, EventArgs e)
{
   ClientScript.RegisterStartupScript(this.GetType(), "Popup", "ShowPopUp();", true);
   for (int i = 0; i < 10; i++)
   {

   }
}

C#

<asp:button ID="btnClick" runat="server" text="Click here" OnClick="btnClick_Click" />

Posted 6-Jul-14 20:59pm

rosharavinda

Updated 6-Jul-14 21:06pm

Thanks7872

v2

Add a Solution

2 solutions

Solution 3

well what sais Tadit Dash is true.

usually i don't like to call javascript from c#, i prefer (if possible) to to the opposite,

here is a more client-like solution (need to include jquery.js in your page) :

HTML

<input type="button" id="btn" />
<script>
    $(function() {
        $("#btn").on("click", function() {

            if (confirm("Do you want to proceed? ") === true) {

                var jqxhr = $.ajax("YourPage.aspx/YourWebMethod")
                    .done(function() {
                    alert("success");
                })
                    .fail(function() {
                    alert("error");
                })
                    .always(function() {
                    alert("complete");
                });
            }
        });
    });
</script>

serverside in YourPage.aspx.cs

C#

[WebMethod] 
public static void YourWebMethod()
{
   for (int i = 0; i < 10; i++)
   {
     //..
   }
}

i like to keep every "gui" manipulation inside javascript, that's why i suggest this approach

Posted 6-Jul-14 21:44pm

nrgjack

Updated 6-Jul-14 21:47pm

v3

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Tadit Dash (ତଡିତ୍ କୁମାର ଦାଶ) · Accepted Answer · 2014-07-06T21:20:00

I would suggest you to use OnClientClick Event.

So, the code would look like...

ASP.NET

<asp:Button ID="btnClick" runat="server" Text="Click here" OnClick="btnClick_Click" OnClientClick="return ShowPopUp();" />

And update the JavaScript function as...

JavaScript

<script type="text/javascript">
    function ShowPopUp() {
        return confirm("Do you want to proceed? ");
        //alert(result);
    }
</script>

So, when user would click Ok in confirm box, it would return you true, hence it will then fire the Button Click Server Side Event. Otherwise, it would return false and stay as it is.