How to access the contentpage controls in javascript

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Hi,
I m working with Master page and contentpage. I want to validate content page controls in javscript using button click event.

I give that following coding. but it is not access it.

C#

if (document.getElementById("txtBloodGroup").value == "") {
        alert("Please Enter Blood Group Name");
        return false;
    }

So I give following coding

C#

var id = document.getElementById("<%=txtBloodGroup.ClientID");
  if (id.value == "") {
      alert("Please Enter Blood Group Name");
      id.focus();
      return false;
  }

But this is also not working. If i check that name at runtime using firebug, the id of the control is like 'ctl00_ContentPlaceHolder1_txtBloodGroup'

If i give this id, it is working. but it is not a correct method. what can i do i solve this problem.

Posted 14-May-13 0:34am

UshaCbe

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Comments

Mahesh Bailwal 14-May-13 6:57am

I think there is syntax error at var id = document.getElementById("<%=txtBloodGroup.ClientID") as your closing server tag (%>) is missing. If I am not wrong.

2 solutions

Solution 2

Please use JQUERY

JavaScript

$(document).ready(function(){
     $("[$id='btnSubmit']").click(function(){
          if($("[$id='txtBloodGroup']").val() == ''){
               alert("Please enter blood group name");
          }
     });
});

Posted 14-May-13 2:50am

Sachin Kakade

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Pandiaraj_4u · Accepted Answer · 2013-05-14T01:14:00

Yes you are right.. Using ContentPageID_ControlID not good,

But we have an option try like below it will help you...

On the Submit Button Client Click Event call a user defined function and on that function try the below code...

JavaScript :

C#

var elems = document.getElementsByTagName("*");
for (var i = 0; i < elems.length; i++) {
    if (elems[i].id.indexOf("txtBloodGroup") != -1)
     {
      if (elems[i].value == "") {
        alert("Please Enter Blood Group Name");
        elems[i].focus();
        return false;
      }
    }
}

Also, Read this Finding Controls in a Master Page with jQuery Article, Here they discuss about this issue and solution....