Hide a custom text field based on a select list value

[Sujit Dash]

HI ,

Need some one help to fullfill one of my requirement.

i need to hide a filed based on the another select list value.i am using the below Java script and placed in the description section of the field which i want to hide.

<script type="text/javascript">
Category = document.getElementById('CTR_Sub-Category');
if (Category) {
target = document.getElementById('customfield_11995');
// Hide the target field if priority isn't critical
if (priority.value != 2) target.style.display='none';

priority.onchange=function() {
if (this.value == 2) {
target.style.display = '';
target.value="enter message here";
} else {
target.style.display='none';
}
}
}
</script>

I am unable to view or hide this filed.

Please help.

[Sujit Dash]

i am using JIRA 7.

and please find below the script which i am using.

<script type="text/javascript">
Category = document.getElementById('CTR_Sub-Category');
if (Category) {
target = document.getElementById('customfield_11995');
// Hide the target field if priority isn't critical
if (Category.value != 2) target.style.display='none';

Category.onchange=function() {
if (this.value == 2) {
target.style.display = '';
target.value="enter message here";
} else {
target.style.display='none';
}
}
}
</script>