Develop Reference

jQuery get value closest input field

I have HTML code like this:
<tr>
<td class='qty'><input class='narrow' value='1' /><i class='fa fa-trash' aria-hidden='true'></i></td>
<td class='comm'><input class='narrow' value='' size='5'/></td>
</tr>
This code will be auto generated by a JS function, so it happens more often.
to get the Value from the first input I use this function:
jQuery('#tbl_order .qty input').bind('change', function() {
Within this function I want to get the next input value. I have tried this what does not work
jQuery(this).closest(".comm input").val()

.closest()
For each element in the set, get the first element that matches the selector by testing the element itself and traversing up through its ancestors in the DOM tree.
You can use find() on the closest tr element. I will also prefer using on() and input event instead of bind() and change respectively.
Demo:
jQuery('#tbl_order .qty input').on('input', function() {
var nextVal = jQuery(this).closest("tr").find(".comm input").val();
console.log(nextVal);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table>
<tr id="tbl_order">
<td class='qty'><input class='narrow' value='1' /><i class='fa fa-trash' aria-hidden='true'></i></td>
<td class='comm'><input class='narrow' value='1234' size='5'/></td>
</tr>
</table>

You can use next() combines with closest()
$('#tbl_order .qty input').bind('change', function() {
var $currentTd = $(this).closest("td");
var $nextTd = $currentTd.next();
var value = $nextTd.find("input").val();
console.log(value);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<table id="tbl_order">
<tr>
<td class='qty'><input class='narrow' value='1' /><i class='fa fa-trash' aria-hidden='true'></i></td>
<td class='comm'><input class='narrow' value='' size='5'/></td>
</tr>
</table>

$('.fa fa-trash').on('click', function () {
$tr = $(this).closest('tr');
var data = $tr.children('td').map(function () {
return $(this).text();
}).get();
console.log(data);
<table id="tbl_order">
<tr>
<td><input class='narrow' value='1' /><i class='fa fa-trash' aria-
hidden='true'></i></td>
<td><input class='narrow' value='' size='5'/></td>
</tr>
</table>
this may give you some idea about mapping function. here I give jquery onclick class to fa fa-trash. so whenever the event is fired the particular row get selected. (i hope in the table your getting data from backend code)

Jquery check the checkbox in td before

I have a table in html with td contains a checkbox input like this
<table id="my_table">
<tr>
<td><input type="checkbox" name="td1"></td>
<td><input type="checkbox" name="td2"></td>
</tr>
<tr>
<td><input type="checkbox" name="td3"></td>
<td><input type="checkbox" name="td4"></td>
</tr>
</table>
<script>
$('[type=checkbox]').change(function () {
if($(this).is(":checked")) {
$(this).closest('td').prev().find('input[type=checkbox]').prop('checked', true);
}
});
</script>
I wanna create a function in jquery that when I check a checkbox the one above it is checked (example if td3 is checked then td1 is checked also) but the one i used check the input next to this and not above it.
Thanks for your help

One approach, though using plain JavaScript rather than jQuery, is to assign an event-listener, for the change event, to the parent <td> element. From there find its cellIndex property to find the correct cell, and descendant <input>, in the previous row, to change:
// retrieve the <table> element, by its id property:
var table = document.getElementById('my_table'),
// find all the <td> elements within the <table>:
cells = table.getElementsByTagName('td'),
// convert the collection of <td> elements
// into an Array (using an ES5 approach because
// of my work browser):
cellArray = Array.prototype.slice.call(cells, 0);
// if ES6 is available to you the following would
// be more concise:
// cellArray = Array.from( cells );
// iterating over the Array of cells:
cellArray.forEach(function(cell) {
// 'cell', the first argument, is a reference to
// the current array-element (a <td> node)
// of the Array over which we're iterating.
// here we add the event-listener for the 'change'
// event, using the anonymous method to handle the
// functionality:
cell.addEventListener('change', function(e) {
// 'this' is the <td> element, the 'cell' variable:
var index = this.cellIndex,
// e is the event-object passed into the
// anonymous function,
// e.target is the element that triggered
// the event we were listening for, the
// descendant <input>; the checked property
// is Boolean, and will return true if it's
// checked and false if not:
checked = e.target.checked,
// the parentNode of a <td> is the <tr>:
row = this.parentNode,
// the previous <tr> element is the
// previousElementSibling (the first
// of the element's previous-siblings
// that is also an element, so excluding
// textNodes, commentNodes etc:
previousRow = row.previousElementSibling;
// if we have a previous row:
if (previousRow) {
// we find its children (which are elements,
// children is different from childNodes):
previousRow.children[index]
// we then find the first, if any, <input>
// element with a 'type' property of 'checkbox':
.querySelector('input[type=checkbox]')
// and set its checked state to the same
// Boolean value as the <input> which fired the
// the change event:
.checked = checked;
}
});
});
var table = document.getElementById('my_table'),
cells = table.getElementsByTagName('td'),
cellArray = Array.prototype.slice.call(cells, 0);
cellArray.forEach(function(cell) {
cell.addEventListener('change', function(e) {
var index = this.cellIndex,
checked = e.target.checked,
row = this.parentNode,
previousRow = row.previousElementSibling;
if (previousRow) {
previousRow.children[index].querySelector('input[type=checkbox]').checked = checked;
}
});
});
<table id="my_table">
<tr>
<td>
<input type="checkbox" name="td1">
</td>
<td>
<input type="checkbox" name="td2">
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="td3">
</td>
<td>
<input type="checkbox" name="td4">
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="td5">
</td>
<td>
<input type="checkbox" name="td6">
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="td7">
</td>
<td>
<input type="checkbox" name="td8">
</td>
</tr>
</table>
JS Fiddle demo.
References:
Array.from().
Array.prototype.forEach().
Array.prototype.slice().
document.getElementById().
document.querySelector().
document.querySelectorAll().
HTMLTableCellElement properties, including cellIndex.
EventTarget.addEventListener().
Node.childNodes.
Node.parentNode.
NonDocumentTypeChildNode.previousElementSibling.
ParentNode.children.

Use index() to get index of clicked checkbox td and accordingly check another previous checkbox
$('[type=checkbox]').change(function () {
index = $(this).closest('td').index();
if($(this).is(":checked")) {
$(this).closest('tr').prev().find('input:checkbox').eq(index).prop('checked', true);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<table id="my_table">
<tr>
<td><input type="checkbox" name="td1"></td>
<td><input type="checkbox" name="td2"></td>
</tr>
<tr>
<td><input type="checkbox" name="td3"></td>
<td><input type="checkbox" name="td4"></td>
</tr>
</table>

Check the following example. It uses index() to get the clicked cell's index. Then selects the previous row and finds the respective checkbox:
$('[type=checkbox]').change(function () {
var that = $(this);
// Get clicked cell's index
var index = that.closest('td').index();
// Get previous row's cell with same index
var aboveTd = that.closest('tr').prev('tr').find('td').eq(index).find('input[type=checkbox]');
// Toggle checked state
aboveTd.prop('checked', that.is(":checked"));
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="my_table">
<tr>
<td><input type="checkbox" name="td1"></td>
<td><input type="checkbox" name="td2"></td>
</tr>
<tr>
<td><input type="checkbox" name="td3"></td>
<td><input type="checkbox" name="td4"></td>
</tr>
</table>

You can do something like this:
$('[type=checkbox]').change(function() {
if ($(this).closest('tr').prev().has('input[type="checkbox"]')) {
var idx = $(this).closest('td').index();
$(this).closest('tr').prev().find('td:eq(' + idx + ') input[type=checkbox]').prop('checked', this.checked);
}
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table id="my_table">
<tr>
<td>
<input type="checkbox" name="td1">
</td>
<td>
<input type="checkbox" name="td2">
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="td3">
</td>
<td>
<input type="checkbox" name="td4">
</td>
</tr>
</table>

click anywhere on a table row and it will check the checkbox its in...?

I'm trying to figure out how to do this, but I can't find it out. Basically I want to be able to click anywhere on a table row and it will check/ unchecked the checkbox its in. I know it's possible because that's what PHPMyAdmin does...
here is my table row
<tbody>
<tr id="1" onclick="selectRow(1)"><td width="20px"><input type="checkbox" id="1" name="1/"></td><td>1</td><td>2011-04-21 22:04:56</td><td>action</td></tr>
<tr id="2" onclick="selectRow(2)"><td width="20px"><input type="checkbox" id="2" name="2/"></td><td>2</td><td>2011-04-21 22:04:56</td><td>action</td></tr>
</tbody>

<script type="text/javascript">
function selectRow(row)
{
var firstInput = row.getElementsByTagName('input')[0];
firstInput.checked = !firstInput.checked;
}
</script>
...
<tbody>
<tr onclick="selectRow(this)"><td width="20px"><input type="checkbox" id="chk1" name="chk1/"></td><td>1</td><td>2011-04-21 22:04:56</td><td>action</td></tr>
<tr onclick="selectRow(this)"><td width="20px"><input type="checkbox" id="chk2" name="chk2/"></td><td>2</td><td>2011-04-21 22:04:56</td><td>action</td></tr>
</tbody>
Note: You've also got collisions on ids. Your ids should be unique.
Here's an alternative with programmatic binding:
document.querySelector("table").addEventListener("click", ({target}) => {
// discard direct clicks on input elements
if (target.nodeName === "INPUT") return;
// get the nearest tr
const tr = target.closest("tr");
if (tr) {
// if it exists, get the first checkbox
const checkbox = tr.querySelector("input[type='checkbox']");
if (checkbox) {
// if it exists, toggle the checked property
checkbox.checked = !checkbox.checked;
}
}
});
<table>
<tbody>
<tr>
<td>
<input type="checkbox" id="chk1" name="chk1" />
</td>
<td>1</td>
<td>2011-04-21 22:04:56</td>
<td>action</td>
</tr>
<tr>
<td>
<input type="checkbox" id="chk2" name="chk2" />
</td>
<td>2</td>
<td>2011-04-21 22:04:56</td>
<td>action</td>
</tr>
<tr>
<td>
<input type="checkbox" id="chk2" name="chk3" />
</td>
<td>2</td>
<td>2011-04-21 25:30:16</td>
<td>action</td>
</tr>
</tbody>
</table>

You don't need JavaScript for this:
td label {
display: block;
}
<td width="20px"><input type="checkbox" id="chk2" name="chk2/"></td><td><label for="chk2">2</label></td><td><label for="chk2">2011-04-21 22:04:56</label></td><td><label for="chk2">action</label></td>
Just labels and a little CSS.

Try this one out...
$("tr").click(function() {
var checkbox = $(this).find("input[type='checkbox']");
checkbox.attr('checked', !checkbox.attr('checked'));
});
http://jsfiddle.net/dVay8/

Since this question getting so many views and the accepted answer has a small issue.
The issue is when you click on the checkbox it won't change. Actually what happens is the checkbox toggles twice. Because of we clicked on the checkbox and the table row as well. So here is a proper solution with a fix.
$('tr').click(function(event){
var $target = $(event.target);
if(!$target.is('input:checkbox'))
{
$(this).find('input:checkbox').each(function() {
if(this.checked) this.checked = false;
else this.checked = true;
})
}
});
Good luck devs.

How to select all checkboxes with jQuery?

I need help with jQuery selectors. Say I have a markup as shown below:
<form>
<table>
<tr>
<td><input type="checkbox" id="select_all" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
</table>
</form>
How to get all checkboxes except #select_all when user clicks on it?

A more complete example that should work in your case:
$('#select_all').change(function() {
var checkboxes = $(this).closest('form').find(':checkbox');
checkboxes.prop('checked', $(this).is(':checked'));
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<table>
<tr>
<td><input type="checkbox" id="select_all" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
</table>
</form>
When the #select_all checkbox is clicked, the status of the checkbox is checked and all the checkboxes in the current form are set to the same status.
Note that you don't need to exclude the #select_all checkbox from the selection as that will have the same status as all the others. If you for some reason do need to exclude the #select_all, you can use this:
$('#select_all').change(function() {
var checkboxes = $(this).closest('form').find(':checkbox').not($(this));
checkboxes.prop('checked', $(this).is(':checked'));
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<table>
<tr>
<td><input type="checkbox" id="select_all" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
</table>
</form>

Simple and clean:
$('#select_all').click(function() {
var c = this.checked;
$(':checkbox').prop('checked', c);
});
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<form>
<table>
<tr>
<td><input type="checkbox" id="select_all" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]" /></td>
</tr>
</table>
</form>

Top answer will not work in Jquery 1.9+ because of attr() method. Use prop() instead:
$(function() {
$('#select_all').change(function(){
var checkboxes = $(this).closest('form').find(':checkbox');
if($(this).prop('checked')) {
checkboxes.prop('checked', true);
} else {
checkboxes.prop('checked', false);
}
});
});

$("form input[type='checkbox']").attr( "checked" , true );
or you can use the
:checkbox Selector
$("form input:checkbox").attr( "checked" , true );
I have rewritten your HTML and provided a click handler for the main checkbox
$(function(){
$("#select_all").click( function() {
$("#frm1 input[type='checkbox'].child").attr( "checked", $(this).attr("checked" ) );
});
});
<form id="frm1">
<table>
<tr>
<td>
<input type="checkbox" id="select_all" />
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="select[]" class="child" />
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="select[]" class="child" />
</td>
</tr>
<tr>
<td>
<input type="checkbox" name="select[]" class="child" />
</td>
</tr>
</table>
</form>

$(function() {
$('#select_all').click(function() {
var checkboxes = $(this).closest('form').find(':checkbox');
if($(this).is(':checked')) {
checkboxes.attr('checked', 'checked');
} else {
checkboxes.removeAttr('checked');
}
});
});

$(document).ready(function(){
$("#select_all").click(function(){
var checked_status = this.checked;
$("input[name='select[]']").each(function(){
this.checked = checked_status;
});
});
});

jQuery(document).ready(function () {
jQuery('.select-all').on('change', function () {
if (jQuery(this).is(':checked')) {
jQuery('input.class-name').each(function () {
this.checked = true;
});
} else {
jQuery('input.class-name').each(function () {
this.checked = false;
});
}
});
});

This code works fine with me
<script type="text/javascript">
$(document).ready(function(){
$("#select_all").change(function(){
$(".checkbox_class").prop("checked", $(this).prop("checked"));
});
});
</script>
you only need to add class checkbox_class to all checkbox
Easy and simple :D

$("#select_all").change(function () {
$('input[type="checkbox"]').prop("checked", $(this).prop("checked"));
});

Faced with the problem, none of the above answers do not work. The reason was in jQuery Uniform plugin (work with theme metronic).I hope the answer will be useful :)
Work with jQuery Uniform
$('#select-all').change(function() {
var $this = $(this);
var $checkboxes = $this.closest('form')
.find(':checkbox');
$checkboxes.prop('checked', $this.is(':checked'))
.not($this)
.change();
});

One checkbox to rule them all
For people still looking for plugin to control checkboxes through one that's lightweight, has out-of-the-box support for UniformJS and iCheck and gets unchecked when at least one of controlled checkboxes is unchecked (and gets checked when all controlled checkboxes are checked of course) I've created a jQuery checkAll plugin.
Feel free to check the examples on documentation page.
For this question example all you need to do is:
$( '#select_all' ).checkall({
target: 'input[type="checkbox"][name="select"]'
});
Isn't that clear and simple?

$('.checkall').change(function() {
var checkboxes = $(this).closest('table').find('td').find(':checkbox');
if($(this).is(':checked')) {
checkboxes.attr('checked', 'checked');
} else {
checkboxes.removeAttr('checked');
}
});

$("#select_all").live("click", function(){
$("input").prop("checked", $(this).prop("checked"));
}
});

I'm now partial to this style.
I've named your form, and added an 'onClick' to your select_all box.
I've also excluded the 'select_all' checkbox from the jquery selector to keep the internet from blowing up when someone clicks it.
function toggleSelect(formname) {
// select the form with the name 'formname',
// then all the checkboxes named 'select[]'
// then 'click' them
$('form[name='+formname+'] :checkbox[name="select[]"]').click()
}
<form name="myform">
<tr>
<td><input type="checkbox" id="select_all"
onClick="toggleSelect('myform')" />
</td>
</tr>
<tr>
<td><input type="checkbox" name="select[]"/></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]"/></td>
</tr>
<tr>
<td><input type="checkbox" name="select[]"/></td>
</tr>
</table>

Here's a basic jQuery plugin I wrote that selects all checkboxes on the page, except the checkbox/element that is to be used as the toggle:
(function($) {
// Checkbox toggle function for selecting all checkboxes on the page
$.fn.toggleCheckboxes = function() {
// Get all checkbox elements
checkboxes = $(':checkbox').not(this);
// Check if the checkboxes are checked/unchecked and if so uncheck/check them
if(this.is(':checked')) {
checkboxes.prop('checked', true);
} else {
checkboxes.prop('checked', false);
}
}
}(jQuery));
Then simply call the function on your checkbox or button element:
// Check all checkboxes
$('.check-all').change(function() {
$(this).toggleCheckboxes();
});

JavaScript +css - Change main category's checkbox css, if any items beneath it are checked

All,
I have the attached code snippet where a category checkbox is checked if all items underneath it are checked. How can I modify the code such that:
If any checkbox underneath any category is checked, the CSS Style of it's parent "Category" checkbox should look greyed out. (I do not want to disable the checkbox. Just look grey or any color through CSS). This will denote some items are checked if the category is collapsed.
If all items are checked underneath a category, then the checkbox doesn't have to look greyed out as it will be checked too.
All the existing code functionality should be maintained as it works great..
PS: Sorry for the HTML being a mess...
Any suggestions?
Thanks
<html>
<head>
<script src="http://www.google.com/jsapi"></script>
<script>
google.load("jquery", "1.3.2");
google.load("jqueryui", "1.7.2");
</script>
<script language="JavaScript">
function toggleTableRows()
{
$(document).ready(function() {
$('img.parent')
.css("cursor","pointer")
.toggle(
function() {
$(this).attr("title","Click to Expand")
$(this).attr("src","arrow_collapsed.gif");
$('tr').siblings('#child-'+this.id).toggle();
},
function() {
$(this).attr("title","Click to Collapse");
$(this).attr("src","arrow_expanded.gif");
$('tr').siblings('#child-'+this.id).toggle();
}
);
initCheckBoxes();
});
}
function toggleCheckboxes(current, form, field) {
$(document).ready(function() {
$("#"+ form +" :checkbox[name^='"+ field +"[']")
.attr("checked", current.checked);
});
}
function toggleParentCheckboxes(current, form) {
var checked = $("#"+ form +" :checkbox[name='"+ current.name +"']").length ==
$("#"+ form +" :checkbox[name='"+ current.name +"']:checked").length;
// replace '[anything]' with '' instead of just '[]'
$("#"+ form +" :checkbox[name='"+ current.name.replace(/\[[^\]]*\]/, "") +"']")
.attr("checked", checked);
}
function initCheckBoxes(form) {
$("#"+ form +" :checkbox:checked").each(function() {
if (this.name.match(/chk[0-9]\[.*\]/)) {
toggleParentCheckboxes(this, form);
}
});
}
</script>
<script language="JavaScript">toggleTableRows();</script>
<style type="text/css">tr.c1 {display: none;}</style>
</head>
<body>
<form name="frmDinnerMenu" id="frmDinnerMenu" method="POST" action="">
<table border=1>
<tr>
<td><img class="parent" id="0" src="arrow_collapsed.gif" title="Click to Expand">Category - Fruits</td>
<td><input type="checkbox" name="chk0" onclick="toggleCheckboxes(this, 'frmDinnerMenu', 'chk0');"/></td>
</tr>
<tr class="c1" id="child-0">
<td>Apple</td>
<td><input type="checkbox" value="true" name="chk0[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
<tr class="c1" id="child-0">
<td>Banana</td>
<td><input type="checkbox" value="false" name="chk0[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
<tr class="c1" id="child-0">
<td>Orange</td>
<td><input type="checkbox" checked value="true" name="chk0[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
<tr>
<td><img class="parent" id="1" src="arrow_collapsed.gif" title="Click to Expand">Category - Vegetables</td>
<td><input type="checkbox" name="chk1" onclick="toggleCheckboxes(this, 'frmDinnerMenu', 'chk1');"/></td>
</tr>
<tr class="c1" id="child-1">
<td>Eggplant</td>
<td><input type="checkbox" value="true" name="chk1[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
<tr class="c1" id="child-1">
<td>Tomato</td>
<td><input type="checkbox" value="false" name="chk1[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
<tr class="c1" id="child-1">
<td>Cabbage</td>
<td><input type="checkbox" checked value="true" name="chk1[]" onclick="toggleParentCheckboxes(this, 'frmDinnerMenu');"/></td>
</tr>
</table>
</form>
</body>
</html>

Code looks familiar ;)
Include a CSS class similar to this one (add further styling if you need it)
.graymeout { background-color:#D8D8D8 }
Change toggleParentCheckboxes to this (some "optimizations" included. Refactored out common selector parts and removed a "double" selection by using filter)
function toggleParentCheckboxes(current, form) {
var selector1 = "#"+ form +" :checkbox[name='";
var selector2 = selector1 + current.name +"']";
var set = $(selector2);
var checked = set.length == set.filter(":checked").length;
// replace '[anything]' with '' instead of just '[]'
var ele = $(selector1 + current.name.replace(/\[[^\]]*\]/, "") +"']");
ele.attr("checked", checked);
if(!checked)
ele.addClass("graymeout")
else
ele.removeClass("graymeout");
ele=null; set=null; selector1=null; selector2=null;
}
If you change the call to initCheckBoxes in toggleTableRows to initCheckBoxes("frmDinnerMenu"); you will get the highlighting also on page load instead of just when first child is changed.

I had also used the same approach as mentioned by jitter. It works pretty well and in my opinion is the only option available since a tri-state check box is not available on a browser.