[SOLVED] detect input text

[ted_chou12]

Hello, is there a way to detect if something has been inputed into the input text box? I dont mean after clicking the submit button, I want the detection to be ongoing, immediately after entering a string, the detection will catch it,

Thanks,

Ted

[webster08]

create a function to check the input box value's length and add the function to a onkeyup() event in the input box.

[ted_chou12]

Thanks, this is what I got so far, but i cant get it to work:

<script type="text/javascript">
function check(what)
{
var length=what.nickname.value.length;	
if (length > 1)
document.getElementById("myButton1").value="New Button Text";
}
</script>

<form id="myform" method="post" action="" enctype="multipart/form-data">
<input type="button" value="Button Text" id="myButton1"></input>
<input type="text" id="tfield" value="" size="50" maxlength="300" onkeyup="check(this.id)" />
</form>

Ted

[webster08]

do it like this:

 

<script type="text/javascript">
function check(what)
{
   var length=document.getElementById(what).value.length;   
   if (length > 1)
   document.getElementById("myButton1").value="New Button Text";
}
</script>

<form id="myform" method="post" action="" enctype="multipart/form-data">
<input type="button" value="Button Text" id="myButton1"></input>
<input type="text" id="tfield" value="" size="50" maxlength="300"  />
</form>

[ted_chou12]

Thank you that worked well