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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();;
}});

jQuery group of checkbox issue

I have two group of checkbox newBuilding & oldBuilding.
Idea over here is I can select checkbox only one of the group.
In each group there is checkbox name other area, so I when click on it, it will show and hide textbox next to it.
Now to achieve first point, lets for example that already we have oldBuilding checkboxes are checked and I if I click one of the newBuilding checkbox then it will remove the check from oldBuilding group but newBuilding checkbox will not get checked but just get focus, I have to click again to check.
What I found out that above issue happen when I call trigger event. How can I overcome the issue
Code for other area
$("#chkOldBuildingOtherAreas").change(function () {
if ($("#chkOldBuildingOtherAreas").is(":checked"))
$("#txOldOtherAreas").show();
else
$("#txOldOtherAreas").hide();
});
$("#chkNewBuildingOtherAreas").change(function () {
if ($("#chkNewBuildingOtherAreas").is(":checked"))
$("#txNewOtherAreas").show();
else
$("#txNewOtherAreas").hide();
});
Code for removing check mark from other groups
$("input[name='oldBuilding']").change(function () {
if ($("input[name='newBuilding']:checked").length > 0) {
$("input[name='newBuilding']").removeAttr('checked');
$("#chkNewBuildingOtherAreas").trigger("change");
}
});
$("input[name='newBuilding']").change(function () {
if ($("input[name='oldBuilding']:checked").length > 0) {
$("input[name='oldBuilding']").removeAttr('checked');
$("#chkOldBuildingOtherAreas").trigger("change");
}
});
My jsfiddle
https://jsfiddle.net/milindsaraswala/wchrwjnx/

https://jsfiddle.net/1ny36nwL/4/
var groups = ['.oldGroup', '.newGroup'];
$(groups.join(',')).find('input[type=text]').hide();
function resetGroup(selector) {
//clear and hide texts
$('input[type=text]', selector).val('').hide();
//uncheck boxes
$('input[type=checkbox]', selector).removeAttr('checked');
}
$("input[name='oldBuilding']").change(function(e) {
if (this.id == 'chkOldBuildingOtherAreas') {
$("#txOldOtherAreas").toggle();
}
resetGroup('.newGroup');
});
$("input[name='newBuilding']").change(function(e) {
if (this.id == 'chkNewBuildingOtherAreas') {
$("#txNewOtherAreas").toggle();
}
resetGroup('.oldGroup');
});
as you can see I added groups var which can contain multiple groups (not only two), but code need to be changed a little more for that to work
you need to detect id/class of current group by something like $(this).closest('.form-group').id and reset every group except current group. in that way you can leave only one change function which will be universal
oh and you also need to add some class for checkbox that contain text input, and if that checkbox is clicked, trigger toggle for input. so it won't be if (this.id == 'chkNewBuildingOtherAreas') { but something like if ($(this).hasClass('has-input'))

Try replacing this in your code. It should work.
$("#txOldOtherAreas").hide();
$("#txNewOtherAreas").hide();
$("input[name='oldBuilding']").change(function (e) {
$("input[name='newBuilding']").removeAttr('checked');
e.target.checked = true;
if (e.target.id == "chkOldBuildingOtherAreas") {
$("#txOldOtherAreas").show();
$("#txNewOtherAreas").hide();
} else {
$("#txNewOtherAreas").hide();
}
});
$("input[name='newBuilding']").change(function (e) {
$("input[name='oldBuilding']").removeAttr('checked');
e.target.checked = true;
if (e.target.id == "chkNewBuildingOtherAreas") {
$("#txNewOtherAreas").show();
$("#txOldOtherAreas").hide();
} else {
$("#txOldOtherAreas").hide();
}
});

You can try following code to fix the problem (Tested in fiddle):
$('#txNewOtherAreas, #txOldOtherAreas').hide();
$('input[name="oldBuilding"]').on('click', function(){
if($('input[name="newBuilding"]').is(':checked')){
$('input[name="newBuilding"]').removeAttr('checked');
$('#txNewOtherAreas').hide();
}
});
$('input[name="newBuilding"]').on('click', function(){
if($('input[name="oldBuilding"]').is(':checked')){
$('input[name="oldBuilding"]').removeAttr('checked');
$('#txOldOtherAreas').hide();
}
});
$('#chkNewBuildingOtherAreas').on('click', function() {
if($(this).is(':checked')){
$('#txNewOtherAreas').show();
} else {
$('#txNewOtherAreas').hide();
}
});
$('#chkOldBuildingOtherAreas').on('click', function() {
if($(this).is(':checked')){
$('#txOldOtherAreas').show();
} else {
$('#txOldOtherAreas').hide();
}
});

Issue with checkbox listener in multifield

I have a multifield component with a 1 checkbox in each item. I am adding a listener so that if one check box is checked all others should be unchecked automatically. I am writing the listener with jquery. When I check the next item in multifield, the functionality works fine, however, it doesn't work when I check a previous checkbox in the multifield item.
whats around with this code:
Check =
function(e) {
$("input[name='./isActive']").each(function () {
if($(this).attr('id') !== e.id && $(this).attr('checked') && e.getValue() !== false) {
if (confirm('Do you want to replace Alert message?')) {
$(this).removeAttr('checked');
return;
} else {
e.setValue(false);
return;
}
}
});
}
Thanks in advance

Hope this resolve your issue
JS FIDDLE
$(document).ready(function(){
$('.multiChecks').change(function() {
if($(this).prop('checked')){
$('.multiChecks').not(this).removeAttr('checked');
}
}); });

$(document).ready(function(){
$('.multiChecks').change(function() {
var index = $( '.multiChecks' ).index( this );
if($(this).prop('checked')){
$('.multiChecks:gt('+index+')').removeAttr('checked');
$('.multiChecks:;t('+index+')').removeAttr('checked');
}
});
});

javascript run function if everything is checked, filled, selected

I have a problem with javscript. I was wonder is it possible to create something like this in javascript:
<script>
function all_is_filled(){
if($('input[type=checkbox]').checked && document.getElementById('text_field').value!="" )
{
//do something...
}
}
</script>
So when someone check checkbox and fill text_field then this do something...Is there a way to do it?

This will work:
function all_is_filled() {
if ($('input[type=checkbox]').prop('checked') == true && $('#text_field').value != "") {
//do something...
}
};
$('#myform').on('change', function () {
all_is_filled()
});
I added a listen function to call all_is_filled() on change, but you can also put it onsubmit.
Simple demo HERE

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();
});
});