Textbox enable /disable on drop down change

S P

Hi, i want to use javascript code to enable/disable the textbox on selection of value from drop down list. My javascript code is not working.

 type="text/javascript">
 function changetextbox() { 
if (document.getElementById("mfi_4_a_i").value === "noy")
 {         document.getElementById("sdd").disable='true';
 } else {  
       document.getElementById("sdd").disable='false'; }
 }

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Nilesh Shah9y ago
Accepted answer
Hi

It is "disabled" and you have written "disable"

When in doubt always use alert();

check my attached working example and sample code below:
>

<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
    <meta charset="utf-8" />
    <title>title>
    <script type="text/javascript">

function changetextbox() {
     alert(document.getElementById("mfi_4_a_i").value);
if (document.getElementById("mfi_4_a_i").value === "noy")

{
    document.getElementById("sdd").disabled = 'true';

} else {

       document.getElementById("sdd").disabled = ''; }

} script>
head>
<body>
    <select onchange="changetextbox();" id="mfi_4_a_i">
        <option value="noy">noyoption>
        <option value="abc">abcoption>
    select>
    <br />
    <input type="text" id="sdd" />
body>
html>
Nilesh Shah9y ago
Hi

Considering the fact that category says HTML and your code is HTML too, I presented this solution.

I suggest you raise a new question in MVC category and also attach your code in that, mentioning what is not working
S P9y ago
Sorry, I forgot to mention that i am using this code for MVC. I tried this code.But it didn't work for me.