Show Hide Textbox using Javascript in ASP.Net

Question

This code not working in ASP.Net and give the error

Microsoft JScript runtime error: 'select' is null or not an object

my code is

var select = document.getElementsByTagName("Dd_Select_Month_Year")[0];
       select.onchange = function () {
           if (select.value == "2") {
               document.getElementsByTagName("txtDateFrom")[1].style.display = "inline";
               document.getElementsByTagName("txtDateTo")[1].style.display = "inline";
           } else {
               document.getElementsByTagName("txtDateFrom")[1].style.display = "none";
               document.getElementsByTagName("txtDateTO")[1].style.display = "none";
           }

       }

I try too much search of this platform but i cant get the solution of this issue
Try to replace all your 'getElementsByTagName' to 'getElementsById' in notepad or whatever.
It would be helpful if you post markup as well. Also watch for txtDateTo vs. txtDateTO - some browsers are case-sensitive.

c.P.u1 · Accepted Answer · 2013-06-13 11:29:31Z

Tag name is the HTML element's tag name. For a <select> element, the tag name is "select". Since there is no element with a tag "Dd_Select_Month_Year", getElementsByTagName() returns null.

Use

document.getElementsByTagName("select")[0];

Or if "Dd_Select_Month_Year" is your select's name attribute's value, that is,

<select name="Dd_Select_Month_Year">...</select>

use:

document.getElementsByName("Dd_Select_Month_Year")[0];

Thanks C.P.u1 and also Vadz for help and slove my problem but one thing that how we write select with asp.net tags

Satpal · Answer 2 · 2013-06-13 11:25:02Z

select as variable name should be avoided.

Reference:

Try to use other word as variable name

var select2 = document.getElementsByTagName("Dd_Select_Month_Year")[0];
select2.onchange = function () {
    //Do whatever
}

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