We Keep Coding

How do I trigger a custom javascript event when a checkbox is selected via a jQuery script that selects all checkboxes on a page?

I'm currently working on a photography store website. Customers will be allowed to view photosets ranging from 100-500 images on a page. I want those customers to be able to click a "Select All" button (or other element) that checks all the checkboxes on the page. I am currently using jQuery to successfully accomplish this "Select All" feature after researching here on Stack Overflow.
Currently, the code that I am working with puts a checkbox on each image in the photoset. If the user clicks the checkbox, it triggers a custom event. However, I want the checkbox state of being checked (or the change from being unchecked to checked) to trigger the event, not the click. If the click triggers the event, the Select All feature I have using jQuery fails to work, since jQuery isn't "clicking" each of the checkboxes on the page, only changing the checkbox to selected. This means that the custom event doesn't load.
The code that currently works to trigger the event I need by clicking (which I do not want to do) the checkbox is:
$('.select-product').on('click', this.QuickOrder.loadProduct);
The code I am trying to develop isn't working, but it goes something like:
$('.select-product').change(function(){
var isChecked = $(this).is(':checked');
if(isChecked) {
this.QuickOrder.loadProduct;
}
});
I've used the .change() function after researching and finding that the change function registers the change in the condition of the checkbox. When this condition changes to true, I want QuickOrder.loadProduct to trigger. After that, everything should work.
Here is my jQuery "Select All" script for reference:
$(document).ready(function() {
$("#select_all").change(function(){
if(this.checked){
$(".select-product").each(function(){
this.checked=true;
})
}else{
$(".select-product").each(function(){
this.checked=false;
})
}
});
$(".select-product").click(function () {
if (!$(this).is(":checked")){
$("#select_all").prop("checked", false);
}else{
var flag = 0;
$(".select-product").each(function(){
if(!this.checked)
flag=1;
})
if(flag == 0){ $("#select_all").prop("checked", true);}
}
});
});
Any ideas on how to make this happen? Thank you!

As explained in Why isn't my checkbox change event triggered?:
The change event does not fire when you programmatically change the value of a check box.
Below I give two solutions (the first is from the aforementioned link):
1: Explicitly trigger the change event after changing the checkbox setting.
this.checked = true;
$(this).trigger('change');
2: Just programmatically delegate to the click event.
$(this).trigger('click');
Demo:
window.loadProduct = function(id) { alert('loadProduct() called on #'+id+'.'); };
// propagate select-all checkbox changes to all individual checkboxes
$("#select_all").change(function() {
if (this.checked) {
$(".select-product").each(function() {
// original code
//this.checked = true;
// solution #1: explicitly force a change event
this.checked = true;
$(this).trigger('change');
// solution #2: trigger click
//$(this).trigger('click');
});
} else {
$(".select-product").each(function() {
this.checked = false;
});
} // end if
});
// propagate individual checkbox changes back to the select-all checkbox
$(".select-product").click(function() {
if (!$(this).is(":checked")) {
$("#select_all").prop("checked", false );
} else {
var flag = 0;
$(".select-product").each(function() {
if (!this.checked)
flag = 1;
});
if (flag == 0) {
$("#select_all").prop("checked", true );
} // end if
} // end if
});
// call loadProduct() for any change of an individual checkbox
$('.select-product').change(function() {
var isChecked = $(this).is(':checked');
if (isChecked) {
loadProduct(this.id);
} // end if
});
.select_container {
margin-bottom:8px;
}
.img_container {
display:flex;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="select_container">
<input id="select_all" type="checkbox"/>
</div>
<div class="img_container">
<div>
<div><img src="https://www.gravatar.com/avatar/4fa45261dec56004145c653832504920?s=128&d=identicon&r=PG&f=1"/></div>
<input id="check1" class="select-product" type="checkbox"/>
</div>
<div>
<div><img src="https://www.gravatar.com/avatar/fc03f6eed7d4d5e3233c5dde9f48480d?s=128&d=identicon&r=PG&f=1"/></div>
<input id="check2" class="select-product" type="checkbox"/>
</div>
<div>
<div><img src="https://www.gravatar.com/avatar/fd882c2b5e410936a4a607b2e87465d9?s=128&d=identicon&r=PG&f=1"/></div>
<input id="check3" class="select-product" type="checkbox"/>
</div>
</div>

Set of actions before enabling submit button

I want my form to meet a set of criterias before the submit button gets enabled, my form is in this order:
Text field, value has to be over 150
Set of radio selects, 1 has to be selected
TOS box, has to be checked
So far I have this:
if ((parseInt($('#amount').val(), 10) > 149) && $('input:radio[name="radioset1"]').is(':checked') && ($('input.checkbox_check').is(':checked')))
{
// Enable Button here
}
Do I have to add this to everything I'm checking, for example keyup on the textfield, change on the select and checkbox and set true in variables that those fields are "OK" or how do I do it ?

You need to create a custom validate function, which you have to run onchange of your text field, and on click of your radio and checkbox click event.
Following psudo code might help you.
var textFieldValidationPassed = false;
function validateFormFields() {
//First checks if text field length is not less then 150.
// then check if one of the radio button is selected.
// then check for TOS box checked state;
if (textFieldValidationPassed && $('input:radio[name="radioset1"]').is(':checked') && ($('input.checkbox_check').is(':checked')))
// enable submit button;
}
}
$('input:radio[name="radioset1"]', 'input.checkbox_check').click(function() {
validateFormFields();
})
$('#amount').keyup(function(){
if($(this).val().length > 149) {
textFieldValidationPassed =true;
validateFormFields();
}
})

it is a workaround but will work, make submit button initially...
$(":submit").on('focus',Validate);
function Validate(){
if ((parseInt($('#amount').val(), 10) > 149) && $('input:radio[name="radioset1"]').is(':checked') && ($('input.checkbox_check').is(':checked')))
{
// Enable Button here
}
else
{
//Disable button
}
}

You can just add click, change events at once like this
$("input").on("change, click", function(){
});
Write your logic within this.
Also you've checkbox validation wrong. Check box will be clicked.
$('input.checkbox_check').prop('checked')
Here is the complete code
$(function(){
$("input").on("change, click", function(){
if ((parseInt($('#UserName').val(), 10) > 149) && $('input:radio[name="gender"]').is(':checked') && $("#remember").prop('checked'))
{
$("#submit").removeAttr("disabled");
}
else{
$("#submit").attr("disabled", "disabled");
}
});
});
WORKING FIDDLE

You can use jQuery.validate. You can define custom validation methods too.
http://jqueryvalidation.org

You can use HTML5 validation. For example:
<input type="checkbox" required name="checkbox1" />
<input type="text" min="150" name="input1" />
You can see another example here http://www.w3schools.com/html/html5_form_attributes.asp

You can call it at textbox, radiobutton and checkbox onchange events.
EDIT:
$(document).ready(function () {
$("input").change(function () {
//call function.
});
});

PHP - reload first page from anywhere on button click

I have the below javascript function which displays updated values after a UI slider selection on the click of a button. I have disabled the button across pages so that the button will not be clicked again.
$(function () {
var disabled = localStorage.getItem("updateDisabled");
if (disabled) $('#update').attr('disabled', disabled);
});
$("#update").click(function (){
this.disabled = true;
localStorage.setItem("updateDisabled", true);
$("#kwBody > tr").each(function() {
var $cells = $(this).children("td");
var found=false,count=0,currentCell;
for (var i=0;i<masterData.length;i++) {
currentCell=$cells.eq(i+1);
found = parseInt(currentCell.text(),10) >=masterData[i];
currentCell.toggleClass("found",found); //add or remove class to highlight
count+=found;
}
window.console && console.log(masterData,count);
$(this).toggle(count==masterData.length); // show if all cells >
});
In my page, I am trying to include another button like "Back" which when clicked on, will reload the initial page itself.
<form method="post" action"willdoit.php">
<input type = "button" value = "Back"></input>
</form>
However if I click on the button nothing happens.

<input type ="submit" value ="Back" />
This will submit your form. Your button you have will only be a button and do nothing.

Change the type to input type ="submit"

change radio button state when parent is clicked

I have this markup :
<div class='A'>
<input type='radio' name='B' class='B' />
</div>
<div class='A'>
<input type='radio' name='B' class='B' />
</div>
<div class='A'>
<input type='radio' name='B' class='B' />
</div>
The desired functionality is to select the radio either by clicking parent div or the radio input itself and if the radio is already checked then click on parent will have no effect i.e return false.
I have made it to change on click of parent, but when i click on the radio button , nothing happens.
What's wrong with my approach ?
jQuery :
$('input:radio').closest('div').on('click', function (e) {
if ($('input:radio', this).prop('checked') === true) {
console.log("returning false");
return false;
}
$('input:radio', this).prop('checked', true);
console.log("Clicked : " + $(this).attr('class'));
});
Fiddle : http://jsfiddle.net/pSSc9/1/

May I suggest using label elements instead of divs? You'll get the same behavior and won't need javascript at all. CSS will take care of the appearance. I made that simple change in your fiddle, and it worked fine.
http://jsfiddle.net/jeffman/WQEDv/2/

$('.A').on('click', function (e) {
if ($(e.target).is('.B')) {
e.stopPropagation();
// So that event does not bubble when radio is selected
} else {
if ($('input:radio', this).prop('checked') === true) {
console.log("returning false");
return false;
}
$('input:radio', this).prop('checked', true);
}
console.log("Clicked : " + $(e.target).attr('class'));
});
The problem with your code was you were returning false when the checkbox is clicked. So you were indirectly doing event.preventDefault() and event.stopPropagation() by doing return false;
You explicitly need to set the checked property to true only when clicked on the div. But when you click on the radio it performs the default action. So you need to stop the propagation of the event.
Check Fiddle

DEMO
e.preventDefault(); disables the radio button click event
$('input:radio').closest('div').on('click', function (e) {
$('input:radio', this).prop('checked', true);
});

The click event from the radio button is bubbling up to the div, so the callback gets triggered in both cases. The problem is that you're preventing the default action which, in the case of the radio button, is it becoming checked.
What you can do is add a condition that exits the callback if the element clicked was the radio button:
$('input:radio').closest('div').on('click', function (e) {
if ($(e.target).is('input')) {
return;
}
if ($('input:radio', this).prop('checked') === true) {
console.log("returning false");
return false;
}
$('input:radio', this).prop('checked', true);
console.log("Clicked : " + $(this).attr('class'));
});
Working example

Enable button when checkboxes selected

I have multiple checkboxes and a submit button that is initially disabled. When checking a box the button is enabled and when unchecking, the button is disabled again.
If have multiple checkboxes selected but uncheck one, the button becomes disabled even though I have selected other checkboxes. How can I fix this issue?
<script type="text/javascript">
$(function() {
$(".checkbox").click(function() {
$(".delete").attr("disabled", !this.checked);
});
});
</script>
HTML
<input type="checkbox" name="msg[]" value="32" class="checkbox" />
<input type="checkbox" name="msg[]" value="44" class="checkbox" />
<input type="checkbox" name="msg[]" value="26" class="checkbox" />
<button type="submit" class="delete" disabled="disabled">Delete</button>

$(function() {
$(".checkbox").click(function(){
$('.delete').prop('disabled',$('input.checkbox:checked').length == 0);
});
});
Demo: http://jsfiddle.net/AlienWebguy/3U364/

Implement a counter to track how many are checked, rather than just disabling the button. Add 1 every time a box is checked, and subtract 1 every time a box is unchecked. Once the counter hits 0, disable the button. When it changes to 1, enable the button (if it changes to any higher number it will have already been enabled, so you don't need to enable it every time). Sample:
<script type="text/javascript">
var boxcounter;
$(function() {
boxcounter = 0;
$(".checkbox").click(function() {
if(this.checked) {
counter++;
if(counter == 1){
$(".delete").attr("disabled", "");
}
} else {
counter--;
if(counter == 0){
$(".delete").attr("disabled", "disabled");
}
}
}
}
</script>

Try this where I am basically checking if all the checkboxes are not checked then disable the button.
$(function() {
$(".checkbox").click(function() {
$(".delete").attr("disabled", !$(".checkbox:checked").length);
});
});

You need to check the state of the other boxes each time 1 box is toggled.

You can build an array of every checkbox.
Then, loop through testing for checked, and exit the loop on checked (this is what you care about).
If you reach the end of the loop and checked for all was false, then disable the button.
This will prevent one uncheck from disabling the button.
You're currently only checking "this" checkbox rather than all.

This code is Actually works without any error.
var boxcounter;
$(function() {
let boxcounter = 0;
$(".cgv-checkbox").click(function() {
if(this.checked) {
console.log('checked');
boxcounter++;
if(boxcounter == 3){
$("#register_form_Register").removeAttr("disabled");
}
} else {
boxcounter--;
if(boxcounter < 3){
$("#register_form_Register").attr("disabled", "disabled");
}
}
});
});
This will work with multiple checkboxes as well.