Develop Reference

tetxtbox enable/disable on checkbox select/unselect using Javascript

I have a table with three columns and multiple rows. 2nd and third column consist of a textbox(first child of a container) and a checkbox respectively.
Textbox
<td class="SBS1 c4">
<input class="Medium InputText" type="text" name="QR~QID33#1~1~1~TEXT" id="QR~QID33#1~1~1~TEXT" value="" disabled="">
<label class="offScreen" for="QR~QID33#1~1~1~TEXT">&nbsp; - &nbsp; - hh</label>
</td>
Checkbox
<td class="SBS2 c7">
<input type="checkbox" id="QR~QID33#2~1~1" name="QR~QID33#2~1~1" value="Selected">
<label class="q-checkbox q-checked" for="QR~QID33#2~1~1"></label>
<label class="offScreen" for="QR~QID33#2~1~1">&nbsp; - 󠆺random text</label>
</td>
I have to disable and enable the textboxes in each row on checkbox check and uncheck respectively using javascript. but there seem to be some pagelifecycle issues with the script I am using. Here is the Javascript that I am using in my Qualtrics survey JS interface,
Qualtrics.SurveyEngine.addOnload(function()
{
/*Place Your JavaScript Here*/
var count=document.getElementsByClassName("q-checkbox").length;
for(var i=0;i<count;i++)
{
document.getElementsByClassName("q-checkbox")[i].parentNode.addEventListener("click",hideFunc);
}
function hideFunc()
{
console.log(this.className);
if(this.classList.contains("checkers"))
{
//this.classList.toggle("checkers");
this.previousSibling.previousSibling.previousSibling.firstChild.disabled="false";
this.classList.add("checkers");
return;
}
else
if(!(this.classList.contains("checkers")))
{
this.previousSibling.previousSibling.previousSibling.firstChild.disabled="true";
this.classList.remove("checkers");
return;
}
}
});
I am just trying to toggle or add/remove the class "checkers"and setting "disabled" property of the texboxes accordingly. The code above in HideFunc is one of the work-around I have tried but it is not working.
Is there another way to check for checkbox change?

As the first comment hinted, a better approach is to check the status of the checkbox rather than add/remove a class. Also, making use of prototypejs makes it easier. Try this:
Qualtrics.SurveyEngine.addOnload(function() {
var qid = this.questionId;
$(qid).select('tr.Choice').each(function(choice,idx) { //loop through each row
var cbox = choice.select('td.SBS2').first().down(); //cbox enables 1st question in row
var txtEl = choice.select('td.SBS1').first().down(); //text input to be enabled/disabled
if(cbox.checked == false) { //initialize text input disabled status
txtEl.value = null; //blank text input
txtEl.disabled = true; //disable text input
}
cbox.on('click', function(event, element) { //enable/disable text input on cbox click
if(cbox.checked == false) { //unchecked
txtEl.value = null; //blank text input
txtEl.disabled = true; //disable text input
}
else { //checked
txtEl.disabled = false; //enable text input
}
}); //end on function
}); //end row loop
});

This is another solution I could come up with ,apart from the correct solution by T. Gibbons
var $j= jQuery.noConflict();
$j("td.SBS2 ").click(function(){
$j(this).closest("tr").find(".InputText").prop("disabled",$j(this).children("input")[0].checked);
$j(this).closest("tr").find(".InputText").prop("value","");
var len=document.getElementsByClassName("InputText").length;
for(var i=0;i<=len;i++)
{
document.getElementsByClassName("InputText")[i].style.width="300px";
}
});

Verify checked checkbox javascript

I'm trying to update in "real time" if I check and uncheck in a list of checkboxs.
With this code:
window.onload = function () {
var input = document.getElementById('listTaxi');
function check() {
var a = input.checked ? "checked" : "not checked";
console.log(a);
}
input.onchange = check;
check();
}
I can do this for one checkbox, but how can I make for multiple checkboxs? A list(div) of checkboxs?
Thanks!!

Assign a class on all checkboxes you want to check if checked or not.
Checkboxes
<input type="checkbox" class="checkboxes" id="checkbox1"/>
<input type="checkbox" class="checkboxes" id="checkbox2"/>
<input type="checkbox" class="checkboxes" id="checkbox3"/>
<input type="checkbox" class="checkboxes" id="checkbox4"/>
Pure Javascript
// getting all checkboxes
var checkboxes = document.getElementsByClassName('checkboxes');
// go through all checkboxes
for(var i = 0; i <= checkboxes.length - 1; i++){
checkboxes[i].onchange = function(e){
alert('Element with id ' + e.target.getAttribute('id') + ' is checked ' +e.target.checked);
}
}
Codepen http://codepen.io/todorutandrei/pen/rLBQOX
Or you can use JQUERY - is it more simple
$('.checkboxes').change(function(){
var item = $(this);
alert('Element with id ' + item.attr('id') + ' is ' + item.is(':checked'));
})
Codepen http://codepen.io/todorutandrei/pen/MegzwR

make them all the same class or give the all the same custom attribute
$(".classname")
$("input[name='customName'])
Jquery will then select all with those
$("#id").change(function() {//if using class name or custom attr loop through the return elements and use a function below to handle the cases
if($(this).is(":checked")) {
//code if checked
}
else{
//code if not checked
}
});

Validating a checkbox after already validating other sections of a form [duplicate]

I have a form with multiple checkboxes and I want to use JavaScript to make sure at least one is checked. This is what I have right now but no matter what is chosen an alert pops up.
JS (wrong)
function valthis(){
if (document.FC.c1.checked) {
alert ("thank you for checking a checkbox")
} else {
alert ("please check a checkbox")
}
}
HTML
<p>Please select at least one Checkbox</p>
<br>
<br>
<form name = "FC">
<input type = "checkbox" name = "c1" value = "c1"/> C1
<br>
<input type = "checkbox" name = "c1" value = "c2"/> C2
<br>
<input type = "checkbox" name = "c1" value = "c3"/> C3
<br>
<input type = "checkbox" name = "c1" value = "c4"/> C4
<br>
</form>
<br>
<br>
<input type = "button" value = "Edit and Report" onClick = "valthisform();">
So what I ended up doing in JS was this:
function valthisform(){
var chkd = document.FC.c1.checked || document.FC.c2.checked||document.FC.c3.checked|| document.FC.c4.checked
if (chkd == true){
} else {
alert ("please check a checkbox")
}
}
I decided to drop the "Thank you" part to fit in with the rest of the assignment. Thank you so much, every ones advice really helped out.

You should avoid having two checkboxes with the same name if you plan to reference them like document.FC.c1. If you have multiple checkboxes named c1 how will the browser know which you are referring to?
Here's a non-jQuery solution to check if any checkboxes on the page are checked.
var checkboxes = document.querySelectorAll('input[type="checkbox"]');
var checkedOne = Array.prototype.slice.call(checkboxes).some(x => x.checked);
You need the Array.prototype.slice.call part to convert the NodeList returned by document.querySelectorAll into an array that you can call some on.

This should work:
function valthisform()
{
var checkboxs=document.getElementsByName("c1");
var okay=false;
for(var i=0,l=checkboxs.length;i<l;i++)
{
if(checkboxs[i].checked)
{
okay=true;
break;
}
}
if(okay)alert("Thank you for checking a checkbox");
else alert("Please check a checkbox");
}
If you have a question about the code, just comment.
I use l=checkboxs.length to improve the performance. See http://www.erichynds.com/javascript/javascript-loop-performance-caching-the-length-property-of-an-array/

I would opt for a more functional approach. Since ES6 we have been given such nice tools to solve our problems, so why not use them.
Let's begin with giving the checkboxes a class so we can round them up very nicely.
I prefer to use a class instead of input[type="checkbox"] because now the solution is more generic and can be used also when you have more groups of checkboxes in your document.
HTML
<input type="checkbox" class="checkbox" value=ck1 /> ck1<br />
<input type="checkbox" class="checkbox" value=ck2 /> ck2<br />
JavaScript
function atLeastOneCheckboxIsChecked(){
const checkboxes = Array.from(document.querySelectorAll(".checkbox"));
return checkboxes.reduce((acc, curr) => acc || curr.checked, false);
}
When called, the function will return false if no checkbox has been checked and true if one or both is.
It works as follows, the reducer function has two arguments, the accumulator (acc) and the current value (curr). For every iteration over the array, the reducer will return true if either the accumulator or the current value is true.
the return value of the previous iteration is the accumulator of the current iteration, therefore, if it ever is true, it will stay true until the end.

Check this.
You can't access form inputs via their name. Use document.getElements methods instead.

Vanilla JS:
var checkboxes = document.getElementsByClassName('activityCheckbox'); // puts all your checkboxes in a variable
function activitiesReset() {
var checkboxesChecked = function () { // if a checkbox is checked, function ends and returns true. If all checkboxes have been iterated through (which means they are all unchecked), returns false.
for (var i = 0; i < checkboxes.length; i++) {
if (checkboxes[i].checked) {
return true;
}
}
return false;
}
error[2].style.display = 'none'; // an array item specific to my project - it's a red label which says 'Please check a checkbox!'. Here its display is set to none, so the initial non-error label is visible instead.
if (submitCounter > 0 && checkboxesChecked() === false) { // if a form submit has been attempted, and if all checkboxes are unchecked
error[2].style.display = 'block'; // red error label is now visible.
}
}
for (var i=0; i<checkboxes.length; i++) { // whenever a checkbox is checked or unchecked, activitiesReset runs.
checkboxes[i].addEventListener('change', activitiesReset);
}
Explanation:
Once a form submit has been attempted, this will update your checkbox section's label to notify the user to check a checkbox if he/she hasn't yet. If no checkboxes are checked, a hidden 'error' label is revealed prompting the user to 'Please check a checkbox!'. If the user checks at least one checkbox, the red label is instantaneously hidden again, revealing the original label. If the user again un-checks all checkboxes, the red label returns in real-time. This is made possible by JavaScript's onchange event (written as .addEventListener('change', function(){});

You can check that atleast one checkbox is checked or not using this simple code. You can also drop your message.
Reference Link
<label class="control-label col-sm-4">Check Box 2</label>
<input type="checkbox" name="checkbox2" id="checkbox2" value=ck1 /> ck1<br />
<input type="checkbox" name="checkbox2" id="checkbox2" value=ck2 /> ck2<br />
<script>
function checkFormData() {
if (!$('input[name=checkbox2]:checked').length > 0) {
document.getElementById("errMessage").innerHTML = "Check Box 2 can not be null";
return false;
}
alert("Success");
return true;
}
</script>

< script type = "text/javascript" src = "js/jquery-1.6.4.min.js" > < / script >
< script type = "text/javascript" >
function checkSelectedAtleastOne(clsName) {
if (selectedValue == "select")
return false;
var i = 0;
$("." + clsName).each(function () {
if ($(this).is(':checked')) {
i = 1;
}
});
if (i == 0) {
alert("Please select atleast one users");
return false;
} else if (i == 1) {
return true;
}
return true;
}
$(document).ready(function () {
$('#chkSearchAll').click(function () {
var checked = $(this).is(':checked');
$('.clsChkSearch').each(function () {
var checkBox = $(this);
if (checked) {
checkBox.prop('checked', true);
} else {
checkBox.prop('checked', false);
}
});
});
//for select and deselect 'select all' check box when clicking individual check boxes
$(".clsChkSearch").click(function () {
var i = 0;
$(".clsChkSearch").each(function () {
if ($(this).is(':checked')) {}
else {
i = 1; //unchecked
}
});
if (i == 0) {
$("#chkSearchAll").attr("checked", true)
} else if (i == 1) {
$("#chkSearchAll").attr("checked", false)
}
});
});
< / script >

Prevent user from deselecting last checked checkbox.
jQuery (original answer).
$('input[type="checkbox"][name="chkBx"]').on('change',function(){
var getArrVal = $('input[type="checkbox"][name="chkBx"]:checked').map(function(){
return this.value;
}).toArray();
if(getArrVal.length){
//execute the code
$('#msg').html(getArrVal.toString());
} else {
$(this).prop("checked",true);
$('#msg').html("At least one value must be checked!");
return false;
}
});
UPDATED ANSWER 2019-05-31
Plain JS
let i,
el = document.querySelectorAll('input[type="checkbox"][name="chkBx"]'),
msg = document.getElementById('msg'),
onChange = function(ev){
ev.preventDefault();
let _this = this,
arrVal = Array.prototype.slice.call(
document.querySelectorAll('input[type="checkbox"][name="chkBx"]:checked'))
.map(function(cur){return cur.value});
if(arrVal.length){
msg.innerHTML = JSON.stringify(arrVal);
} else {
_this.checked=true;
msg.innerHTML = "At least one value must be checked!";
}
};
for(i=el.length;i--;){el[i].addEventListener('change',onChange,false);}
<label><input type="checkbox" name="chkBx" value="value1" checked> Value1</label>
<label><input type="checkbox" name="chkBx" value="value2"> Value2</label>
<label><input type="checkbox" name="chkBx" value="value3"> Value3</label>
<div id="msg"></div>

$('input:checkbox[type=checkbox]').on('change',function(){
if($('input:checkbox[type=checkbox]').is(":checked") == true){
$('.removedisable').removeClass('disabled');
}else{
$('.removedisable').addClass('disabled');
});

if(($("#checkboxid1").is(":checked")) || ($("#checkboxid2").is(":checked"))
|| ($("#checkboxid3").is(":checked"))) {
//Your Code here
}
You can use this code to verify that checkbox is checked at least one.
Thanks!!

How to hide the parent of an unchecked checkbox?

I have a set of random/dynamic generated div checkboxes:
<div>A1 <input type='checkbox' name='A[]' value='A1'> </div>
<div>A2 <input type='checkbox' name='A[]' value='A2'> </div>
<div>A3 <input type='checkbox' name='A[]' value='A3'> </div>
<div>B1 <input type='checkbox' name='B[]' value='B1'> </div>
<div>B2 <input type='checkbox' name='B[]' value='B2'> </div>
<div>C1 <input type='checkbox' name='C[]' value='C1'> </div>
What I am trying to do is when the user:
checks any A then the others will hide (entire div) but all A will still show.
unchecks a checkbox, then all A, B, C will show again.
This is because I am preventing the user from checking a mix of options.
PS:
You can provide a solution that might need me to modify the generated output of checkboxes.

try this fiddle
$("input[type=checkbox]").on("change", function() {
var thisName = $(this).attr("name");
if($(this).is(':checked')){
$(':checkbox').parent().hide();
$('input:checkbox[name|="'+thisName+'"]').parent().show();
} else {
$(':checkbox').parent().show();
}
});​

Try this one,
$('input:checkbox').click(function(){
if($(this).attr('checked') == 'checked'){
$('input:checkbox').parent('div').hide();
$('input:checkbox[name="'+$(this).attr('name')+'"]').parent('div').show();
}else{
if(!$('input:checkbox[checked="checked"]').length){
$('input:checkbox').parent('div').show();
}
}
})
​
Demo: http://jsfiddle.net/muthkum/uRd3e/3/

You can use some JQuery traversing to hide the non-matching elements:
// add the event handler
$("input[type=checkbox]").on("change", function() {
// get whether checked or unchecked
var checked = $(this).prop("checked") === true;
// get the name of the clicked element (eg, "A[]")
var thisName = $(this).prop("name");
// get the name of the clicked element (eg, "A[]")
var thisName = $(this).prop("name");
// get the grandparent element
$(this).parent().parent()
// get all the checkboxes
.find("input[type=checkbox]")
// filter to only the ones that don't match the current name
.filter(function(i, e) { return e.name != thisName; })
// hide or display them
.css("display", checked ? "none" : "");
});

you can simple do it like this
$('input[type=checkbox]').change(function () {
if ($(this).attr('checked')) {
var Name = $(this).prop("name");
$('div').filter(function(){
return $(this).find('input[type=checkbox]').prop("name") != Name;
}).hide();
}
else
{
$('input[type=checkbox]').attr('checked',false);
$('input[type=checkbox]').parent('div').show();
}
});​
Live Demo

Try code bellow:
$(":checkbox").click(function() {
var identifier = $(this).val().substring(0, 1);
$("input[type='checkbox']").each(function() {
if ($(this).val().indexOf(identifier) != -1) {
$(this).parent().show();
} else {
$(this).parent().hide();
}
});
if ($("input:checked").length == 0) {
$("input[type='checkbox']").parent().show();
}
});
You can try on jsFiddle

This will hide all other checkbox types when FIRST of a type is checked and show all the other checkbox types when ALL of the checked box type are unchecked:
$("input:checkbox").on("change", function() {
// get the name attribute
var nameAttr = $(this).prop("name");
// check how many checkbox inputs of that name attribute are checked
var checkedLength = $("input:checkbox[name=\"" + nameAttr + "\"]:checked").length;
// if 0, display other checkbox inputs, else if 1 hide all of the rest
if(checkedLength == 0) {
$("input:checkbox[name!=\"" + nameAttr + "\"]").parent().show();
}else if(checkedLength == 1) {
$("input:checkbox[name!=\"" + nameAttr + "\"]").parent().hide();
}
});

Overwhelmed by choice! Here's a plain JS version that just disables members of the non–selected groups.
I think that's better than hiding them so users can see the other options after they've selected one. Otherwise, to see the other options again, they must deselect all checkboxes in the group.
Note that div is a parent of the inputs, the listener passes a reference to the element and the related event object, modify as required.
<script>
function doStuff(div, evt) {
var checked, el, group, j, inputs, name, re;
var t = evt.target || evt.srcElement;
if (t.nodeName && t.nodeName.toLowerCase() == 'input' && t.type == 'checkbox') {
inputs = div.getElementsByTagName('input');
name = t.name;
// Set checked to true if any input with this name is checked
group = document.getElementsByName(name);
j = group.length;
while (j-- && !checked) {
checked = group[j].checked;
}
// Loop over inputs, hide or show depending on tests
for (var i=0, iLen=inputs.length; i<iLen; i++) {
el = inputs[i];
// If name doesn't match, disable
el.disabled = checked? (el.name != name) : false;
}
}
}
</script>
<div onclick="doStuff(this, event)">
<div>A1 <input type='checkbox' name='A[]' value='A1'></div>
<div>A2 <input type='checkbox' name='A[]' value='A2'></div>
<div>A3 <input type='checkbox' name='A[]' value='A3'></div>
<div>B1 <input type='checkbox' name='B[]' value='B1'></div>
<div>B2 <input type='checkbox' name='B[]' value='B2'></div>
<div>C1 <input type='checkbox' name='C[]' value='C1'></div>
</div>

Thanks guys, especially dbaseman (get me ideal) :
ok, Here is my code after referring from you all.
$("input[type=checkbox]").on("click", function() {
var sta = $(this).is(":checked"); sta=(sta==true?1:0);
if(sta==1){
var thisName = $(this).prop("name"); thisName=thisName.replace("[]","");
$("div input[type=checkbox]:not([name^=" + thisName + "])").parent().hide();
}else{
var num = $("[type=checkbox]:checked").length;
if(num==0){
$("div input[type=checkbox]").parent().show();
}
}
});
so far code able is performing as what i need.
Ps: i am still weak on jquery travelling part
Ps: Edited on re-opening all checkboxes part
Thanks once again!

Select all checkbox functionality in classic asp

I have a select all checkbox followed by individual checkboxes corresponding to each record which comes from database.
How do I implement a javascript function such that when a person checks Select all,all the checkboxes get selected and vice versa.

first give an id to your select all check box say "selectall" and give a class to all other check boxes as allcheck and try using this code .
$("#selectall").click(function() {
if (!$(this).is(':checked'))
{
$('.allcheck').each(function(){
$(this).prop("checked", false);
});
}
else
{
$('.allcheck').each(function(){
$(this).prop("checked", true);
});
}
});
When user unchecks the box all should be unchecked , I guess that is also an expected functionality
NOTE : - I have given this answer assuming that you are using jquery

Try this:
function checkAll(id) {
var checkboxCollection = document.getElementById('<%= chkint.ClientID %>').getElementsByTagName('input');
for (var i = 0; i < checkboxCollection.length; i++) {
if (checkboxCollection[i].type.toString().toLowerCase() == "checkbox") {
checkboxCollection[i].checked = id.checked;
}
}
}
function select() {
var count = 0;
var chkSelectAll = document.getElementById('<%= selectall.ClientID %>');
var chkList = document.getElementById('<%= chkint.ClientID %>').getElementsByTagName("input");
for (var i = 0; i < chkList.length; i++) {
if (chkList[i].checked == true) {
count++;
}
}
if (count == chkList.length)
chkSelectAll.checked = true;
else
chkSelectAll.checked = false;
}
In this code, chkint is the ID of Checkboxlist and selectall is the ID of selectall checkbox.

Similar to Aravind, using jQuery you could group all your checkboxes in a container and give it an ID and give your SelectAll checkbox an ID. After that code is simple, see alse here for fiddle:
$("#selectall").click(function() {
if ($(this).is(':checked'))
$("#selectallcontainer :checkbox").not(this).attr('checked', true);
else
$("#selectallcontainer :checkbox").not(this).attr('checked', false);
});​

Here is a pure javascript solution:
jsFiddle here.
Simply attach the function to the onClick event of your 'Select All' checkbox and wrap the rest of your options in a div like so:
<script>
function checkAll() {
var checkbox_options = document.getElementById("checkbox_options");
var checkbox_all = document.getElementById("checkbox_all");
var checkboxes = checkbox_options.getElementsByTagName("input");
for (i = 0; i < checkboxes.length; i++) {
checkboxes[i].checked = checkbox_all.checked;
}
}
</script>
<label><input id="checkbox_all" type="checkbox" onclick="checkAll()" />Select All</label><br />
<div id="checkbox_options">
<label><input type="checkbox" />CheckBox1</label><br />
<label><input type="checkbox" />CheckBox2</label><br />
<label><input type="checkbox" />CheckBox3</label><br />
</div>