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Check Common Dropdown Items (JavaScript, jQuery)

I need some help with the following code.
So I have a page like the following one in the example.
So far, I tried the following method. (Please check my code and live example)
With my current method to select the checkboxes, I have to write code for each and every option like this.
$("#check_us, #check_us-1, #check_us-2").prop("checked", !0)
Is there any simpler way to do this? for an example can we just select every one which contains us_, as_, eu part without assigning unique values to every option. Any assistance you can provide would be greatly appreciated.
$("button.select-all").on("click", selectAll);
function selectAll() {
$(".schoolareas").toArray().forEach(function (a, c, b) {
$("#check_" + a.id).prop("checked", !0)
})
}
$("button.unselect-all").on("click", unselectAll);
function unselectAll() {
$(".schoolareas").toArray().forEach(function (a, c, b) {
$("#check_" + a.id).prop("checked", !1)
})
}
$("button.select-us").on("click", selectAmerica);
function selectAmerica() {
unselectAll();
$(".schoolareas").toArray();
$("#check_us, #check_us-1, #check_us-2").prop("checked", !0)
}
$("button.select-eu").on("click", selectEurope);
function selectEurope() {
unselectAll();
$(".schoolareas").toArray();
$("#check_eu, #check_eu-1").prop("checked", !0)
}
$("button.select-as").on("click", selectAsia);
function selectAsia() {
unselectAll();
$(".schoolareas").toArray();
$("#check_as, #check_as-1").prop("checked", !0)
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.bundle.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<div class="container-fluid py-4">
<div class="row text-center">
<div class="col-8 offset-2">
<div class="btn-groups">
<button class="btn btn-primary select-all">Select All</button>
<button class="btn btn-primary unselect-all">Unselect All</button>
<button class="btn btn-primary" id="latencybutton">Count</button>
<button class="btn btn-primary dropdown-toggle" type="button" id="dropdownMenu2" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Country/Area</button>
<div class="dropdown-menu" aria-labelledby="dropdownMenu2">
<button class="dropdown-item select-us" type="button">America</button>
<button class="dropdown-item select-eu" type="button">Europe</button>
<button class="dropdown-item select-as" type="button">Asia</button>
</div>
</div>
</div>
</div>
</div>
<div class="container col-8 offset-2">
<div class="table-responsive shadow p-3 mb-5 bg-light rounded text-xs-center">
<table id="grid" class="table table-hover">
<thead class="thead-dark">
<tr>
<th data-type="string">?</th>
<th data-type="string">Locations:</th>
<th data-type="number">Scores:</th>
<th data-type="number">Average:</th>
<th class="thmw" data-type="string">Score Status:</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<input type="checkbox" id="check_eu" checked />
<label for="check_eu"></label>
</td>
<td>London (EU)</td>
<td class="schoolareas" id="eu"></td>
<td></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_eu-1" checked />
<label for="check_eu-1"></label>
</td>
<td>Manchester (EU)</td>
<td class="schoolareas" id="eu-1"></td>
<td></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_us" checked />
<label for="check_us"></label>
</td>
<td>New York (US)</td>
<td class="schoolareas" id="us"></td>
<td></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_us-1" checked />
<label for="check_us-1"></label>
</td>
<td>California (US)</td>
<td class="schoolareas" id="us-1"></td>
<td></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_us-2" checked />
<label for="check_us-2"></label>
</td>
<td>Florida (US)</td>
<td class="schoolareas" id="us-2"></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_as" checked />
<label for="check_as"></label>
</td>
<td>Singapore (AS)</td>
<td class="schoolareas" id="as"></td>
<td class="status"></td>
</tr>
<tr>
<td>
<input type="checkbox" id="check_as-1" checked />
<label for="check_as-1"></label>
</td>
<td>China (AS)</td>
<td class="schoolareas" id="as-1"></td>
<td class="status"></td>
</tr>
</tbody>
</table>
</div>
</div>

Sure you can! Instead of accessing elements by their IDs (which have to be unique), give them all a common class and grab them by that instead.
So elements that look like this:
<input type="checkbox" id="check_us-1" checked />
<input type="checkbox" id="check_us-2" checked />
Get an additional class prop, like this:
<input type="checkbox" id="check_us-1" class="us" checked />
<input type="checkbox" id="check_us-2" class="us" checked />
Then you can update their props in batch like this:
$(".us").prop("checked", !0)

Without modifying your current HTML you can select all elements wich class contains a string with:
$('checkbox[class^="us"]')
and changed their checkbox value like this:
$('checkbox[class^="us"]').prop("checked", !0)
then change us for whatever word you want.

There are several ways you can do this using either JavaScript or jQuery.
You could use the attribute contains selector to find all elements with an id that matches a pattern:
$('[id*="us_"]').prop('checked', true);
This form of selector also works with JavaScript's native document.querySelector() method.
However, this runs the risk of unintentionally selecting irrelevant elements that happen to match the selector. The selector above would also match an element with an id of "status_code", for example.
A better approach is the one that #jonny suggests in his answer. While the id attribute of every element in a document has to be unique, other attributes like "class" do not. This allows you to assign a css class name to a group of related elements and select them by that class name using the class selector. (Again, this selector also works with the document.querySelector method).
Personally, I dislike using css class names to select related groups of elements because css classes are for styling, not for functionality. So another approach you can use if you want to keep style an function separate is to include data attributes like so:
<input type="checkbox" id="check_us-1" checked data-group="us" />
<input type="checkbox" id="check_us-2" checked data-group="us" />
You can then use the attribute selector to select both inputs:
$('[data-group="us"]').prop('checked', true);

check all checkbox (using CSS3 ::before and ::after) programmatically

I'm using a CSS template and trying to draw a table having the following structure:
<tbody>
<tr role="row" class="odd">
<td>
<div class="checkbox">
<input type="checkbox" id="checkbox1" value="check">
<label for="checkbox1"></label>
</div>
</td>
<td><a id="link" href="detail.jsp">2018-06-14 17:41</a></td>
</tr>
<tr class="unread even" role="row">
<td>
<div class="checkbox">
<input type="checkbox" id="checkbox0" value="check">
<label for="checkbox0"></label>
</div></td>
<td><a id="link" href="detail.jsp">2018-06-14 07:57</a></td>
</tr>
</tbody>
the input type checkbox are using a CSS ::before and ::after with the following settings:
[type=checkbox]:checked,[type=checkbox]:not(:checked){...
[type=checkbox]+label:before,[type=checkbox]:not(.filled-in)+label:after{...
[type=checkbox]:not(.filled-in)+label:after{...
[type=checkbox]:not(:checked):disabled+label:before{...
[type=checkbox].tabbed:focus+label:after{...
[type=checkbox]:checked+label:before{...
[type=checkbox]:checked:disabled+label:before{...
I would like to select all checkbox programmatically in Javascript, any idea how I can do it ?

I would like to select all checkbox programmatically in Javascript
If you want to make all checkboxes 'checked' ,for that you can use :
let cbox = document.querySelectorAll("input[type='checkbox']");
for (var i=0; i<cbox.length; i++) {
cbox[i].checked = true;
}
<input type="checkbox" class="c1">
<input type="checkbox" class="c2">
<input type="checkbox" class="c3">
But, if you want to select the :before or :after elements with javascript, you CAN't. They are pseudo-elements and like their name says, they are not actual elements, they are not considered parts of the DOM so they cannot be 'touched', 'selected', 'manipulated' etc. by javascript or jquery etc.

Select all checkboxes using Javascript or jQuery

I want to check/uncheck all check boxes of a particular row in a table if Select all Checkbox is selected for that particular row
Here is the html for a single row.
<tr>
<td class="left">
<label>Admin - Organization</label>
</td>
<td>
<div class="checkbox">
<label><asp:CheckBox cssclass="selectallAO" runat="server" /></label>
</div>
</td>
<td>
<div class="checkbox">
<label><asp:CheckBox cssclass="checkboxAO" ID="chkbxViewAOrganization" runat="server" /></label>
</div>
</td>
<td>
<div class="checkbox">
<label><asp:CheckBox cssclass="checkboxAO" ID="chkbxAddAOrganization" runat="server" /></label>
</div>
</td>
<td>
<div class="checkbox">
<label><asp:CheckBox cssclass="checkboxAO" ID="chkbxEditAOrganization" runat="server" /></label>
</div>
</td>
<td>
<div class="checkbox">
<label><asp:CheckBox cssclass="checkboxAO" ID="chkbxDeleteAOrganization" runat="server" /></label>
</div>
</td>
</tr>
There are 5 other rows like this for other pages as well. So, I want to check/uncheck all checkbox's for a particular row for which Select All was checked/unchecked.

UPDATE
Updated the jQuery function to make the master checkbox override child checkbox states.
How does something like this sound? I wasn't sure which classes were your checkboxes so you'll have to tweak this a bit:
HTML:
<div class="spacer"><input type="checkbox" class="selectallAO"> Select All</div>
<div class="spacer"><input type="checkbox" class="checkboxAO"> Regular</div>
<div class="spacer"><input type="checkbox" class="checkboxAO"> Regular</div>
CSS:
div.spacer {
display: block;
}
JS:
$('.selectallAO').click(function() {
this.checked ? $('.checkboxAO').prop('checked', true) : $('.checkboxAO').prop('checked', false);
});
jsFiddle

The .parents("form:first") selector ensures that it only applies to those elements that are in the same form as the inputs you want to change. If for some reason you want to change elements outside of the form then you will need to remove that.
$(function() {
$(".selectallAO").on("click", function() {
debugger;
if ($(this).prop("checked")) {
$(this).parents("form:first").children(".checkboxAO").prop("checked", true);
} else {
$(this).parents("form:first").children(".checkboxAO").prop("checked", false);
}
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<form>
<input type="checkbox" name="test" value="1" class="selectallAO">Select All</input>
<input type="checkbox" name="test" value="1" class="checkboxAO">1</input>
<input type="checkbox" name="test" value="2" class="checkboxAO">2</input>
<input type="checkbox" name="test" value="3" class="checkboxAO">3</input>
<input type="checkbox" name="test" value="4" class="checkboxAO">4</input>
</form>

Inserting a row break in dynamically generated table

I have table rendered by Apex code in salesfoce.
<div id="wrap" style=""><fieldset style="border: none;"><table role="presentation" style="">
<tbody><tr>
<td>
<input type="radio"value="Casual"><label for="j_id0:j_id2:j_id4:j_id112:0"> CASUAL</label></td>
<td>
<input type="radio" value="BUSINESS CASUAL"><label for="j_id0:j_id2:j_id4:j_id112:1"> BUSINESS CASUAL</label></td>
<td>
<input type="radio" value="Semi-Formal"><label for="j_id0:j_id2:j_id4:j_id112:2"> SEMI-FORMAL</label></td>
<td>
<input type="radio" value="Formal"><label for="j_id0:j_id2:j_id4:j_id112:3"> FORMAL</label></td>
<td>
<input type="radio" value="Costume"><label for="j_id0:j_id2:j_id4:j_id112:4"> COSTUME</label></td>
<td>
<input type="radio" value="Other"><label for="j_id0:j_id2:j_id4:j_id112:5"> OTHER</label></td>
</tr>
</tbody></table></fieldset>
</div>
I need to break the row after third label . which means three inputs/labels in one row.
I can use jQuery. I have tried everything like injecting closing </tr> tag after third input via innerHTML etc . But nothing seems to work .

Try to manipulate the DOM a little bit,
$('<tr>').append($('tr td:gt(2)')).appendTo('tbody');
DEMO

Why the text fields are not getting disabled="disabled" in colorbox popup?

I'm using PHP, Smarty , jQuery, Colorbox - a jQuery lightbox plugin, etc. for my website. Now I'm displaying some output in a popup which is generated by using " Colorbox - a jQuery lightbox plugin". Now I want to disable all the text fields present in this popup when the form loads but if I go to the HTML source of page the disabled="disabled" attribute from the <input> tag gets removed and the text boxes are not getting disabled. Can you tell me why this is happening? For your reference I'm putting below the code which will display the data in a Colorbox pop up.
{if $subject_topic_questions}
{foreach from=$subject_topic_questions item=subject_topic_data}
<div class="hidden">
<div id="topics_{$subject_topic_data.subject_id}" class="c-popup">
<h2 class="c-popup-header">Select Topics</h2>
<div class="c-content">
<input type="hidden" name="subject_names[{$subject_topic_data.subject_id}]" id="subject_names" value="{$subject_topic_data.subject_name}">
<h2 class=""> {$subject_topic_data.subject_name}</h2>
<div class="c-tbl-wrap">
<table width="100%" cellspacing="0" cellpadding="0" border="0" class="c-tbl">
<tbody>
<tr>
<td>
<p class="custom-form">
<input class="custom-check" type="checkbox" name="" id="">
<label class="blue">Select All</label>
</p>
</td>
{foreach from=$difficulty_levels item=diff_levels key=dkey}
<input type="hidden" name="diff_levels[{$dkey}]" value="{$diff_levels}">
<td width="22%" align="center"><strong>{$diff_levels}</strong></td>
{/foreach}
</tr>
{foreach from=$subject_topic_data.topics item=topic_diff_level_data}
<input type="hidden" name="subject_{$subject_topic_data.subject_id}_topics[]" value="{$topic_diff_level_data.topic_id}">
<tr>
<td valign="middle">
<p class="custom-form">
<input type="checkbox" class="custom-check" name="{$sheet_type}_topics_{$subject_topic_data.subject_id}[]" id="{$sheet_type}_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}" value="{$topic_diff_level_data.topic_id}" onChange="enable_topic_ques('{$sheet_type}', '{$subject_topic_data.subject_id}', '{$topic_diff_level_data.topic_id}'); return false;">
<label>{$topic_diff_level_data.topic_name}</label>
<!-- <input type="hidden" name="topic_names[{$topic_diff_level_data.topic_id}]" value="{$topic_diff_level_data.topic_name}"> -->
</p>
</td>
{foreach from=$topic_diff_level_data.difficulty_level item=diff_level key=key_diff_lvl}
<td valign="middle">
{if $site_id=='ENTPRM'}<em>Total {$diff_level.question_count}</em>{/if}
<input type="text" name="{$sheet_type}_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}_{$key_diff_lvl}" id="{$sheet_type}_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}_{$key_diff_lvl}" maxlength="3" class="mini" value="{$diff_level.added_no_questions}" disabled="disabled">
<input type="hidden" name="{$sheet_type}_available_questions_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}_{$key_diff_lvl}" value="{$diff_level.question_count}">
</td>
{/foreach}
</tr>
{/foreach}
</tbody>
</table>
</div>
<p class="center">Done Cancel</p>
</div>
</div>
</div>
{/foreach}
{/if}
The main code you need to consider is as below from the above code:
<input type="text" name="{$sheet_type}_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}_{$key_diff_lvl}" id="{$sheet_type}_{$subject_topic_data.subject_id}_{$topic_diff_level_data.topic_id}_{$key_diff_lvl}" maxlength="3" class="mini" value="{$diff_level.added_no_questions}" disabled="disabled">
Can you tell me how the disabled="disabled" attribute gets vanishes after page load and if there is any way to apply to it, please tell me. Thanks in advance.

$('.mini').prop("disabled", true);
$('.mini').prop("disabled", false);
try this