How to use Javascript for validation in asp.net

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I have one asp.net page with 50 Text box (asp.net control). I want to create one external JavaScript file with one function like this -->

function validate(str)
{
}

From asp.net page, i want to pass only textbox value to JavaScript. Based on the value(filled or blank), return true or false.

Please help in creating it. Send me the code plz, I need it as soon as possible.

Than You

Posted 10-Feb-10 6:18am

Hir's 4Ever

Updated 10-Feb-10 7:21am

Sandeep Mewara

v3

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thatraja · Answer 1 · 2010-02-10T20:50:00

it's just a simple thing man, code is below.

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

In scripts.js file

function validate()
{
      if (document.getElementById("<%=txtfield1.ClientID%>").value=="")
      {
         alert("Field1 can not be empty");
         document.getElementById("<%=txtfield1.ClientID%>").focus();
         return false;
      }
      if (document.getElementById("<%=txtfield2.ClientID%>").value=="")
      {
         alert("Field2 can not be empty");
         document.getElementById("<%=txtfield2.ClientID%>").focus();
         return false;
      }
      .
      .
      .
      .
      .
      .

      if (document.getElementById("<%=txtfield50.ClientID%>").value=="")
      {
         alert("Field50 can not be empty");
         document.getElementById("<%=txtfield50.ClientID%>").focus();
         return false;
      }

      return true;
}

thatraja

Sandeep Mewara · Answer 2 · 2010-02-10T07:24:00

First add an external JavaScript file to the ASPX page:

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

Then when you want to check for textbox content (filled or empty), just pass its value to the function defined in the external javascript file.

There in the function, you can trim(if spaces are to be avoided) and check the length if it contains any text. Based on it, return true or false.

Hir's 4Ever · Answer 3 · 2010-02-10T20:20:00

Solution 2

i alreay try this thing but it not work if u have small program or application then plz send me

Thank you for ur replay

Posted 10-Feb-10 20:20pm

Hir's 4Ever

rosyjoshi · Answer 4 · 2010-02-10T20:47:00

Solution 3

U can add the below method in external java script file.

function IsEmptyText(obj, msg, lbl) {
var str = Trim(obj.value);
if (str == "") {
lbl.innerHTML = msg;
obj.focus();
return false;
}

return true;
}

Add reference of JS file on ur page

Posted 10-Feb-10 20:47pm

rosyjoshi

How to use Javascript for validation in asp.net

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