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How to synchronise ExtJS "checkboxes" (buttons) with Javascript/JQuery?

I am currently trying to synchronize two checkboxes on a page.
I need the checkboxes to be synchronized - to this end, I'm using a Tampermonkey userscript to pick up when one of them is clicked. However, I'm at a loss as to how to do it.
I believe they are not actually checkboxes, but ExtJS buttons that resemble checkboxes. I can't check whether they're checked with JQuery because of this: the checked value is appended to a class once the JS behind the button has run.
I have tried preventDefault and stopPropagation, but either I'm using it wrong or not understanding its' usage.
I'm not quite clever enough to just call the JS behind the box instead of an onclick event. Otherwise, that would solve my issue.
This is my code:
//Variables - "inputEl" is the actual button.
var srcFFR = "checkbox-1097";
var destFFR = "checkbox-1134";
var srcFFRb = "checkbox-1097-inputEl";
var destFFRb = "checkbox-1134-inputEl";
//This checks if they're synchronised on page load and syncs them with no user intervention.
var srcChk = document.getElementById(srcFFR).classList.contains('x-form-cb-checked');
var destChk = document.getElementById(destFFR).classList.contains('x-form-cb-checked');
if (srcChk == true || destChk == false) {
document.getElementById(destFFRb).click();
} else if (destChk == true || srcChk == false) {
document.getElementById(srcFFRb).click();
}
//This is where it listens for the click and attempts to synchronize the buttons.
$(document.getElementById(srcFFRb)).on('click', function(e) {
e.preventDefault();
if (document.getElementById(srcFFR).classList == document.getElementById(destFFR).classList) {
return false;
} else {
document.getElementById(destFFRb).click();
}
});
$(document.getElementById(destFFRb)).on('click', function(e) {
e.preventDefault();
if (document.getElementById(srcFFR).classList == document.getElementById(destFFR).classList) {
return false;
} else {
document.getElementById(srcFFRb).click();
}
});
I'm at a bit of a loss...any help would be greatly appreciated.

Figured it out - I was comparing class lists without singling out what I wanted to actually match.
My solution:
$(document.getElementById(srcFFRb)).on('click', function(){
if (document.getElementById(srcFFR).classList.contains('x-form-cb-checked')
== document.getElementById(destFFR).classList.contains('x-form-cb-checked')) {
return false;}
else {
document.getElementById(destFFRb).click();;
}});
$(document.getElementById(destFFRb)).on('click', function(){
if (document.getElementById(srcFFR).classList.contains('x-form-cb-checked')
== document.getElementById(destFFR).classList.contains('x-form-cb-checked')) {
return false;}
else {
document.getElementById(srcFFRb).click();;
}});

Select2: Multiple select elements constrained

I am trying to achieve something and I can't find/decide what is the best way to do it, so i'm going to ask if somebody did this before or if select2 has something built in in order to achieve what I want.
Heres the thing: I have a number of select (multiple) elements in my DOM, lets say 5, all share the same options, but, If one of the selects has an option selected, I want the others to hide/remove/avoid being selected, I would like to constrain all selects in order to avoid having the same value selected in 2 different selects. I am not asking for a full code solution, I just need to know if someone already did it (if yes, would be nice to get it shared in order for future developers that stumble upon this can see the solution), or if select2 has the functionallity.
What I have done so far is:
$('.constrainedSelect').each(function(i, select) {
var selectedValue = $(select).select2("val");
var options = $('#allOptions').find('option').clone();
if (selectedValue.length !== 0) {
options.each(function(i, option) {
if($(select).find('option[value="' + $(option).val() + '"]').length !== 1) {
$(select).append(option);
}
});
} else {
options.push($("<option />", {value: e.choice.id.trim(), text: e.choice.text.trim()})[0]);
$(select).html(options);
}
});
But thats just a concept and its really buggy.
The version of select2 i'm using (and need to use, no time to change it in production yet) is Version: 3.5.2 Timestamp: Sat Nov 1 14:43:36 EDT 2014
Thanks in advance!

I have found a nice way to do this, if anyone was wondering how, I think this is a good approach but I would like to see comments and if somebody wants to improve my answer, feel free to copy the code and paste it in a separate answer, if the approach gets better I will accept that answer. Thanks guys for the help.
var $selects = $(".constrainedSelects");
$selects.on('change', function(e) {
var selectedValues = $(this).select2('val');
for (var i = 0; i < selectedValues.length; i++) {
$selects.not(this).find("option[value='" + selectedValues[i] + "']").attr('disabled', true);
}
});
$selects.on('select2-removed', function(e) {
$selects.find("option[value='" + e.val + "']").attr('disabled', false);
});
Here is a fiddle to show the result: http://jsfiddle.net/rv38f0v6/

Please See if this helps! this is a jquery validation method to avoid same values in different select boxes.
$.validator.addMethod("valOption", function(value, element) {
var curValue,
allElems,
counter,
totalCount = 0;
curValue = value;
allElems = $('#myPage select');
for (counter = 0; counter < allElems.length; counter = counter + 1) {
if (curValue === allElems.eq(counter).val()) {
totalCount = totalCount + 1;
}
}
if (totalCount === 1) {
return this.optional(element) || (true);
} else {
return (false);
}
}, "Please select different option");

$(document).on('change', '.constrainedSelect', function() {
var changedSelect = $(this);
$(".constrainedSelect").not(changedSelect).select2("val", "").select2("enable", false)
});
I think something like this event listener would take care of it. It makes sure the val of all the others are empty and then disables them so they cannot be selected from.
How about this instead:
Working Fiddle
//setup trackign array and block duplicate selections
var selectedIds = [];
$(document).on('select2-selecting', '.constrainedSelect', function(event) {
var idx = $.inArray(event.val, selectedIds);
if(idx === -1) {
selectedIds.push(event.val);
} else {
event.preventDefault();
}
});
//remove selected item from our tracking array
$(document).on('select2-removed', '.constrainedSelect', function(event) {
var idx = $.inArray(event.val, selectedIds);
selectedIds.splice(idx,1);
});

Unhide div using javascript object oriented

So i am having trouble unhiding a div, once it has been hidden.
The code:
First object
$('#filter_region').on('change', function(e) {
var temp_region_id = $('#filter_region').val();
filterRegionId($temp_region_id);
});
Seconds object:
function filterRegionId(temp_region_id)
{
if ($(temp_region_id) != 1) {
$('.showheadline').hide(); }
else { $('.showheadline').show(); }
}
Really what i want to do, is once the region is changed from the original, the div should be hidden - this works!
However, once the person goes back on the same region, the div is still hidden.
The filter_region echos from 1-8 depending on the region. I realise that i have set the region to 1, this is to test. However, even if the if-statement is set to 1, it still shows the divs when loaded, even if the region is 2-8. Hope this make any sense at all! Please feel free to ask if there are any questions regarding my explanation.
Best Regards,
Patrick

Try this, without the $(..) around the var
$('#filter_region').on('change', function(e) {
var temp_region_id = $('#filter_region').val();
filterRegionId(temp_region_id);
});
function filterRegionId(temp_region_id)
{
if (temp_region_id != 1) {
$('.showheadline').hide();
}
else {
$('.showheadline').show();
}
}

A text input's value attribute will always return a string. You need to parseInt the value to get an integer
var temp_region_id = parseInt($('#filter_region').val(),10);
and remove the $ from variable name filterRegionId($temp_region_id); and if ($(temp_region_id) != 1) {
$('#filter_region').on('change', function(e) {
var temp_region_id = parseInt($('#filter_region').val(),10);
///parse it to integer
filterRegionId(temp_region_id);
});
function filterRegionId(temp_region_id){
if (temp_region_id!= 1)
$('.showheadline').hide();
else
$('.showheadline').show();
}

The best solution is to rewrite you code a little.
Please add the filterRegion function on top and change the parametter name as follows
var temp_region_id = $('#filter_region').val();
filterRegionId(temp_region_id);
$('#filter_region').on('change', function(e) {
temp_region_id= $('#filter_region').val();
filterRegionId(temp_region_id);
});
function filterRegionId(temp_region_id)
{
if ($(temp_region_id) != 1) {
$('.showheadline').hide();
}
else {
$('.showheadline').show();
}
}

JavaScript greater than not working

I have a JavaScript snippet:
function verifyFrnds(){
var boxes=$(".matchFrnds:checked").length;
//alert(boxes); its value is 50 when you do alert
var call=1;
$(".matchFrnds").each(function(index){
if($(this).is(':checked')){
call++;
var sendData= $(this).val();
$.post('SOME PHP Page',{sendData:sendData},function(data){
//window.location.reload();
});
//alert(call); value is 1
// 1 >=50 should be false but all the time the condition gets true
if(call >= boxes)
{
window.location.reload();
}
}
});
}
The question is self explanatory. The conditions gets true even when it is not. Not sure if it is due to that it is not treating them as numbers and strings may be, but all the time the condition gets true.

I'm missing some context but try this:
function verifyFrnds() {
var boxes = $(".matchFrnds:checked").length;
$(".matchFrnds:checked").each(function(index) {
var sendData= $(this).val();
$.post('SOME PHP Page',{sendData:sendData},function(data){
//window.location.reload();
});
if(index >= boxes-1) {
window.location.reload();
return false;
}
});
}

use below code
if(parseInt(call) >= parseInt(boxes))
{
window.location.reload();
}

Doesn't window.location.reload() from your post callback resets your checkboxes thus none being checked ?
1 will always be greater than 0
Of course that this depends on how the form is initialized in HTML, but we don't know this from your example.
Maybe if you present to us a more detailed explanation of what you have and what you want to do, we can present you a better solution.

jQuery: FadeIn a selected value on click

I have a selected box with 5 values. I'm trying to fadeIn inputs of what is selected in the box. For example: If input1 is selected, fade in input1 on click.
Here is what I'm trying to do:
$(document).ready(function(){
$('.btn').click(function() {
if($("#selectbox").value == 'Input1') {
$(".input1").show();
} else if($("#selectbox").value == 'Input2') {
$(".input2").show();
} else if($("#selectbox").value == 'Input3') {
$(".input3").show();
} else if($("#selectbox").value == 'Input4') {
$(".input4").show();
} else if($("#selectbox").value == 'Input5') {
$(".input5").show();
}
}
});
And here is a NOT working fiddle:
http://jsfiddle.net/rzMHJ/

Your code have two errors and that's why its not working.
$("#selectbox").value should be $("#selectbox").val()
you have not closed your click event with );
Also its much better to use switch case in this example.
Working Demo: http://jsfiddle.net/naveen/Zn2yy/
Update (based on Nick Cravers comment)
For this particular scenario you could simplify code a lot like this.
Demo: http://jsfiddle.net/nick_craver/BWacA/

There are two problems with your code that is causing it to fail.
First, replace .value with the jQuery function val().
Second, add ); to the second to last } at the end.
Here is working refactored code:
$(document).ready(function() {
$('.btn').click(function() {
var show = "." + $("#selectbox").val().toLowerCase();
$(show).fadeIn();
});
});