checkbox - Javascript position of onchange assignment -

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i have checkbox , text input. want text input enabled if checkbox checked. found answer problem here, following code did not work:

<!doctype html public "-//w3c//dtd html 4.01//en"  "http://www.w3.org/tr/html4/strict.dtd"> <html lang="en">   <head>     <meta http-equiv="content-type" content="text/html; charset=utf-8">     <title>title</title>     <script type="text/javascript">       document.getelementbyid('yourbox').onchange = function() {         document.getelementbyid('yourtext').disabled = !this.checked;       };     </script>   </head>     <body>          <input type="text" id="yourtext" disabled />           <input type="checkbox" id="yourbox" />     </body> </html>

however, noticed code works if move < script > environment below < input > boxes that

 <!doctype html public "-//w3c//dtd html 4.01//en"  "http://www.w3.org/tr/html4/strict.dtd">     <html lang="en">       <head>         <meta http-equiv="content-type" content="text/html; charset=utf-8">         <title>title</title>       </head>         <body>              <input type="text" id="yourtext" disabled />               <input type="checkbox" id="yourbox" />          <script type="text/javascript">           document.getelementbyid('yourbox').onchange = function() {             document.getelementbyid('yourtext').disabled = !this.checked;           };         </script>         </body>     </html>

why position of < script > environment play role onchange attribute?

that's because page parsed top, , each element added parsed.

when script tag has been parsed code run right away. @ time input tags hasn't been parsed, input elements doesn't exist yet.

by placing script tag below input tags, script runs after input elements has been created.

instead of rearranging code, can use onload event make sure code runs after page parsed:

<!doctype html public "-//w3c//dtd html 4.01//en"  "http://www.w3.org/tr/html4/strict.dtd"> <html lang="en">   <head>     <meta http-equiv="content-type" content="text/html; charset=utf-8">     <title>title</title>     <script type="text/javascript">       window.onload = function() {         document.getelementbyid('yourbox').onchange = function() {           document.getelementbyid('yourtext').disabled = !this.checked;         };       };     </script>   </head>     <body>          <input type="text" id="yourtext" disabled />           <input type="checkbox" id="yourbox" />     </body> </html>

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