Passing asp:TextBox to java script function

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Dear all,

I have this function:

C#

function myFunction(id)
{
    var x;
    x = document.getElementById(id).value;
    if(isNaN(x) || x == "")
    {
      alert('Problem input');
       return false;
     }
     else
     {
       return true;
     }
 }

I want to pass textbox value to the function for the verification. I tried the following:

ASP.NET

<asp:ImageButton ID="imageButtonView" runat="server" Height="60px" ToolTip="بحث" Width="60px" BorderStyle="Solid" ImageUrl="~/Images/searchButton.jpg" OnClick="imageButtonView_Click" OnClientClick="return myFunction('<%=textBoxCustomerCode.ClientID%>');"/>

but it does not work. Any idea how to pass the value to the function.

Thanks in advance.

Posted 21-Dec-15 22:05pm

Member 9646334

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deepankarbhatnagar · Answer 1 · 2015-12-21T22:32:00

Hi, try to use javacript funcion below:

C#

function myFunction()
{
    var x;
    x = document.getElementById('<%= textBoxCustomerCode.ClientID %>').value;
    if(isNaN(x) || x == "")
    {
      alert('Problem input');
       return false;
     }
     else
     {
       return true;
     }
 }

call the function by code below:

ASP.NET

<asp:ImageButton ID="imageButtonView" runat="server" Height="60px" ToolTip="بحث" Width="60px" BorderStyle="Solid" ImageUrl="~/Images/searchButton.jpg" OnClick="imageButtonView_Click" OnClientClick="return myFunction();"/>

Naveen.Sanagasetti · Answer 2 · 2015-12-21T22:14:00

Solution 1

If you want to get textbox value using Jquery do like below

JavaScript

var val = $("#txt1").val();

If you want to get textbox value using Javascript do like below

JavaScript

var val = document.getElementById('<%=txt1.ClientID%>').value;

Posted 21-Dec-15 22:14pm

Naveen.Sanagasetti

Comments

Member 9646334 22-Dec-15 4:15am

I know that this is inside the function but how can I pass it to the function?