How can I use javascript messagebox value in aspx.cs file? Asp.net C#

Question

1.00/5 (1 vote)

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Hi,..
I have a 'button' ,'label' and javascript function.When i click on button then messagebox show ,i insert value in messagebox and i want to use this value in aspx.cs code?How can i do this?

What I have tried:

Here is my cdoe :

ASP.NET

<script type="text/javascript">
function myFunction() {
        var person = prompt("Enter Table Name");

        if (person != null) {
            document.getElementById('txtlabel') = person;
          
        }
    }
</script>
<asp:Button ID="Button2" ValidationGroup="p" runat="server" onclick="insert" OnClientClick="javascript:myFunction()" Text="Create Table" />
<label  runat="server" visible="false" id="txtlabel"></label>

I try this in aspx.cs but not working

C#

string tblName = txtlabel.InnerText.ToString();

Posted 18-Apr-16 7:37am

Hameed Khan

Updated 18-Apr-16 22:57pm

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Comments

Sergey Alexandrovich Kryukov 18-Apr-16 13:51pm

I have no idea what is "JavaScript messagebox". There is no such thing, is there? :-)
It seems that you need to understand what client-side script does, and what the server side does.
—SA

Hameed Khan 18-Apr-16 13:58pm

Just message box show i enter value and i want this value in aspx.cs code??Simple is that

ZurdoDev 18-Apr-16 14:37pm

If you need to access an html control in C# then put a runat="server" tag on it.

3 solutions

Solution 2

You used txtlabel as server object i.e runat="server".
means - you will not have direct access to the server control by the same name from javascript (client end) as the final html might not have the same value as the server name.

What you need to do is use "ClientID" to get the client value.

document.getElementById("<%= txtlabel.ClientID %>") is the object name
and
document.getElementById("<%= txtlabel.ClientID %>").value is the object value

This is the right way to use server control in javascript.

Thanks
Cheers

Posted 18-Apr-16 9:15am

Sandip.Nascar

Updated 18-Apr-16 9:17am

v2

Solution 1

Can you use "alert" in your Javascript to display the value?

JavaScript

alert(person);

And you need to set the value of the element, not the element itself.

JavaScript

document.getElementById('txtlabel').value = person;

Posted 18-Apr-16 8:17am

FrostedSyntax

Comments

Hameed Khan 18-Apr-16 14:25pm

I need value of javascript messagebox...I insert value in message box and use this value in aspx.cs

Hameed Khan 18-Apr-16 14:25pm

alert is used to simple message box.

Hameed Khan 18-Apr-16 14:37pm

I'm receiving null value

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F-ES Sitecore · Accepted Answer · 2016-04-18T22:57:00

Use a hidden field rather than a label, labels are not submitted with a form so you can't pass their data to your server-side code.

HTML

<script type="text/javascript">
    function myFunction() {
        var person = prompt("Enter Table Name");

        if (person != null) {
            document.getElementById('hiddenName').value = person;
        }
    }
</script>
<input type="hidden" name="hiddenName" id="hiddenName" />
<asp:Button ID="Button2" ValidationGroup="p" runat="server" OnClick="insert" OnClientClick="javascript:myFunction()" Text="Create Table" />

Code behind

C#

protected void insert(object sender, EventArgs e)
{
    string value = Request.Form["hiddenName"];
}