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Enable or disable target element based on checkbox checked state

i'm basically JavaScript newbie and I'm trying to resolve this problem of mine for quite a while. So,i'm doing JS school project and I need to make connection between checkbox and text form. If checkbox is not checked, text form should be disabled and vice versa. This is piece of code I have written:
function cbtf() {
if (document.getElementById('checkbox').checked==false) {
document.getElementById('textform').disabled=true;
}
}
Can anyone write a new code ? That would be much of a help.

Simply attach a method to checkbox's onclick handler:
function enableElement(id, enable) {
document.getElementById(id).disabled=!enable;
}
<label>
<input
type="checkbox"
onclick="enableElement('textform', this.checked)"
/>
ENABLE
</label>
<br/>
<textarea id="textform" style="width:100%; height:200px" disabled>
THIS IS TEXTAREA WITH ID "textform"
</textarea>
or another simplification without creating special one-liner method - just define Your will directy in onclick event:
<label>
<input
type="checkbox"
onclick="document.getElementById('textform').disabled = !this.checked"
/>
ENABLE
</label>
<br/>
<textarea id="textform" style="width:100%; height:200px" disabled>
THIS IS TEXTAREA WITH ID "textform"
</textarea>

You can add a click event to the checkbox, and assign it's check state to the disabled property of the TextBox.
document.querySelector('input[type=checkbox]').onclick = function(e) {
document.querySelector('input[type=text]').disabled = e.target.checked;
};
<input type="checkbox" name="">
<input type="text" name="">

You won't get that to work unless you attach an event to the checkbox, so I would suggest something like this:
var textbox = document.getElementById('textform');
var checkbox = document.getElementById('checkbox');
checkbox.addEventListener("change", function() {
if (checkbox.checked) {
textbox.disabled = false;
} else {
textbox.disabled = true;
}
})

javascript onclick radio clear textbox

I would like to clear a text box when a radio button above the text box is selected.
I have tried this:
function clearThis(target){
target = document.getElementById(target);
target.value = "";
}
<input type="radio" name="not_req" id="clear_req" value=""
title="Click here to clear the No Auth need flag"><span id="clear" onclick = 'clearThis("claims")' >Clear
The box I would like to clear is
<input type="text" size="5" name="auth_for" id="claims" value="{$prior_auth->get_auth_for()}" title="Set the number of times no auth can be used">
Took most of this from http://jsfiddle.net/BMrUb/ but I can see that the example is clearing the adjacent text box. I would like to clear a text box not adjacent to the radio button.

As Gerald said place your onclick="" in the <input type="radio" ... >, not in the <span>.

The problem is that it's the sibling input element that needs its value clearing, not the span, even though you only want it to clear when people click on the span element. So the example code below does this. You're also best off decoupling your javascript from your HTML by using event listeners (and not using the old-fashioned onclick attribute).
var clearSpanEl = document.getElementById("clear");
clearSpanEl.addEventListener("click", function(e) {
var inputEl = e.target.previousElementSibling;
inputEl.value = "";
}, false);
<input type="text" name="search" id="search" value="I can be cleared" />
<span id="clear">Clear results</span>
I've forked your JSFiddle here, so you can see it working.

Radio buttons checked changing submit text

My site structure consists on an index.php which is styled by a css file. It then includes the following php code in a separate file:
<?php include("globals.php"); ?>
<form action="<?php echo $website.$relative_string;?>" name="subscribe" onsubmit="javascript:return checkEmail(this);" method="post">
<div id="cell8" class="titlecell2"><h3>Email:</h3></div>
<div id="cell9" class="inputcell2">
<input type="text" class="inputfield2" name="email" value="Your Email..." id="email2" maxlength="255" onfocus="this.value='';">
</div>
<div id="cell10" class="textcell3">
<input name="group" type="hidden" id="group[]" value="<?php echo $group; ?>">
<input name="subscribe" id="sub" type="radio" value="true" checked>
</span>Subscribe </p>
</div>
<div id="cell11" class="buttoncell">
<button type="submit" name="Submit2" value="Join" id="submitButton2">
<span>OK</span>
</button>
</div>
<div id="cell8" class="textcell4">
<input type="radio" name="subscribe" id="unsub" value="false">
</span>Un-Subscribe </p>
</div>
</form>
It appears on screen with no problems in the correct layout as my css style sheet. What I would like this to do is when I select the "Subscribe" radio button the submit button text "OK" changes to "Join". When I click on the Unsubscribe button text "OK" or "Join" changes to "Leave".
I tried to make some code from research:
if(document.getElementById('sub').checked) {
document.write("<span>Join</span>"
}
else if(document.getElementById('unsub').checked) {
document.write("<span>Leave</span>)
}
I think this kind of worked in that it changed to Join (replacing the OK line, but obviously didn't update on clicking unsubscribe. I guess it would update on refreshing the page if my default wasn't join. I guess I need to do some form of onclick but then I have no idea how to adjust that span ok bit.
Please help?
Many thanks Chris

Here is a solution in plain JavaScript without jQuery. It avoids the unnecessary overhead.
This should work, but I haven't had a chance to test it:
var sub = document.getElementById('sub'); // Save element to a variable, so you don't have to look for it again
var unsub = document.getElementById('unsub');
var btn = document.getElementById('submitButton2');
sub.onchange = function() //When sub changes
{
if(sub.checked) //If it's checked
{
btn.innerHTML = "<span>Join</span>"; // Set button to Join
}
else // If not..
{
btn.innerHTML = "<span>OK</span>"; // Set button to OK
}
}
unsub.onchange = function() //When unsub changes
{
if(unsub.checked) //If it's checked
{
btn.innerHTML = "<span>Leave</span>"; // Set button to Leave
}
else // If not..
{
btn.innerHTML = "<span>OK</span>"; // Set button to OK
}
}
However, you should not do it like this.
You should combine the two radio buttons into a radio group.
In that case you will listen for radio group to change, get the value of the radio group, set button text according to the value.

if you label your <span>OK</span> to something like <span id="your_id">OK</span> then added a class to your radio button like this <input class="your_class" type="radio" name="subscribe" id="unsub" value="false"> them...
<script src="//code.jquery.com/jquery-1.10.2.js"></script>
<script>
$("#your_class").change(function () {
if ($(this).is(':checked')) {
$("#your_id").text('Join');
}else {
$("#your_id").text('Leave');
}
});
</script>
This was all written in the browser so let me know if there are any problems.

selecting text next to an checked input checkbox using JQuery (or JS)?

given the next HTML block:
<div class"radioGroup">
<input type="radio" value="0">
This is NOT checked
<input type="radio" value="1" checked = "checked" >
This is checked
<input type="radio" value="2">
This is NOT checked
</div>
How can i select the text following the selected radio button? (e.g "This is checked").
(I cant add tags to the strings or something like that, i'm trying to grab this text from another web page, so i can only use client side scripts)

You can use:
<input ... onclick="alert(this.nextSibling.data);">
Of course that is very dependent on the structure of the DOM. You may want to concatenate the data in all the text nodes from this element to the next, so you might need a function like:
function getTextByNodes(el) {
var text ='';
while (el && el.nextSibling && el.nextSibling.nodeType == 3) {
text += el.nextSibling.data;
el = el.nextSibling;
}
return text;
}
with:
<input ... onclick="alert(getTextByNodes(this));">

JavaScript: Set background of radio button when deselected (group of radio buttons)

I am trying to create a simple interactive form for use with touch screen devices. The majority of the form is made up of radio buttons in groups of 5 (approx. 37 groups). I have a label tag for each radio button, and when selected (clicked), the background-color property of the label is changed to a highlighted colour using this JavaScript within each label tag OnClick="this.style.background='#5555ff';"
What I want to add to the above, is a JavaScript that will remove the above if the selection is changed within the group. E.g. A user selected radio button A in group 1, then changes their selection to radio button B in group 1. At the moment, both label backgrounds will be changed to the defined colour.
The HTML form is created dynamically by PHP so radio button names, IDs, & values will differ.
I have been unsuccessful trying to complete this task myself, and there doesn't seem to be a simple OnUnClick="xxx" either. I have searched on here for a solution but no questions match mine, although I have tried tweaking existing solutions to similar problems but to no avail.
Thank you for reading!

Here you go:
HTML
<html>
<body>
<div>
<input type="radio" id="g1v1" name="g1" value="v1" checked="checked"/> <label for="g1v1">V1</label>
</div>
<div>
<input type="radio" id="g1v2" name="g1" value="v2" /> <label for="g1v2">V2</label>
</div>
<div>
<input type="radio" id="g1v3" name="g1" value="v3" /> <label for="g1v3">V3</label>
</div>
<div>
<input type="radio" id="g1v4" name="g1" value="v4" /> <label for="g1v4">V4</label>
</div>
</body>
</html>
Javascript
$(document).ready(function(){
var selectedRadioColor = "yellow";
var normalRadioColor = "gray";
// For changing color while document loads
$.each($(":radio"), function(){
//alert( $(this).prop("id")+ $(this).prop("checked") );
if($(this).prop("checked") == false)
{
$(this).parent().css("color", normalRadioColor);
}
else
{
$(this).parent().css("color", selectedRadioColor );
}
})
// For updating color when user interacts with radio buttons
$(":radio").click(function(){
$("[name='"+$(this).prop("name")+"']").parent().css("color", normalRadioColor);
$(this).parent().css("color", selectedRadioColor );
})
})
Here is the link to jsfiddle for live demo:
http://jsfiddle.net/dharmavir/6UnDs/

assuming your radio buttons are grouped in a divs like this -
<div class="radio-group">
<INPUT TYPE=RADIO NAME="pizzasize" VALUE="S">small<BR>
<INPUT TYPE=RADIO NAME="pizzasize" VALUE="M">medium<BR>
<INPUT TYPE=RADIO NAME="pizzasize" VALUE="L">large<P>
</div>
You can do something like this in jquery -
$('input[type="radio"]').click(function(){
var parentElement = $(this).parent();
parentElement.find('input').css('background', '#000000'); //set to your neutral background for radio buttons
$(this).css('background', '5555ff');
});