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How can i get attribute value from a checkbox if it's checked?

Well, I have this text input that gets sum of all the attributes of "price" inside all checkboxes are checked.
now i can't get an attribute value from a checkbox.
here is my function:
function sum_options() {
var options = [];
$("#form-field-1-11-1").attr("price", 500);
$("#form-field-1-11-2").attr("price", 500);
$("#form-field-1-11-3").attr("price", 0);
$("#form-field-1-11-4").attr("price", 300);
$("#form-field-1-11-5").attr("price", 500);
$("#form-field-1-11-6").attr("price", 500);
$("#form-field-1-11-7").attr("price", 1250);
$("#form-field-1-11-8").attr("price", 500);
$("#form-field-1-11-9").attr("price", 700);
options[0] = $("#form-field-1-11-1");
options[1] = $("#form-field-1-11-2");
options[2] = $("#form-field-1-11-3");
options[3] = $("#form-field-1-11-4");
options[4] = $("#form-field-1-11-5");
options[5] = $("#form-field-1-11-6");
options[6] = $("#form-field-1-11-7");
options[7] = $("#form-field-1-11-8");
options[8] = $("#form-field-1-11-9");
var total = 0;
$.each(options, function() {
this.on("change", function() {
total += this.attr("price");
});
});
$("#sum-field").val(total);
}
thanks!!!

Your code is a lot more complex than it needs to be.
Firstly, you should use data-* attributes to assign custom data to an element. Creating your own non-standard attributes will mean your HTML is invalid and can lead to other issues. Also, if your code is relying on the price attribute, then it should be in the DOM when the page loads.
Secondly there's no need to build an array of single elements. You can select them all in to a single jQuery object and set a change() event handler on them in a single call. I grouped them by class in the below example.
Lastly you can get the total of all the prices by looping through the :checked boxes and adding up their prices. Try this:
$('.checkbox').change(function() {
var total = 0;
$('.checkbox:checked').each(function() {
total += parseFloat($(this).data('price'));
});
$("#sum-field").val(total);
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<input type="checkbox" id="form-field-1-11-1" class="checkbox" data-price="500" />
<input type="checkbox" id="form-field-1-11-2" class="checkbox" data-price="500" />
<input type="checkbox" id="form-field-1-11-3" class="checkbox" data-price="0" />
<input type="checkbox" id="form-field-1-11-4" class="checkbox" data-price="300" />
<!-- other checkboxes here... -->
<input type="text" id="sum-field" />

To get the value of the Value attribute you can do something like this:
$("input[type='checkbox']").val();
Or if you have set a class or id for it, you can:
$('#check_id').val();
$('.check_class').val();
However this will return the same value whether it is checked or not, this can be confusing as it is differnt to the submitted form behaviour.
To check whether it is checked or not, do:
if ($('#check_id').is(":checked"))
{
// it is checked
}

You just forgot to parse the return value to a number:
parseInt(this.attr("price"));
the attr() function is returning a string value.

Adding an array value to an array retrieved using $.serializeArray()

There are checkboxes, which belong to Form A:
<input type="checkbox" class="item-selector" name="item[]" value="1" />
<input type="checkbox" class="item-selector" name="item[]" value="2" />
<input type="checkbox" class="item-selector" name="item[]" value="3" />
<!-- etc. -->
Then I have Form B that needs the checkbox values from Form A. Form A might have other input fields too, but I'm not interested in those. I only care about $('input.item-selector'). I'm going about it like this:
var postData = $('#form-a').serializeArray();
var items = $('.item-selector:checked').map(function(){
return this.value;
}).get();
if(items.length > 0) {
postData.push({name: 'itemId', value: items});
}
But this way of adding stuff to the postData doesn't seem to work, because the PHP script I send the form to can not find the itemId. Interestingly this does work:
postData.push(name: 'aName', value: 'notAnArrayButAStringValue');
I also tried a couple of solutions like this one: http://benalman.com/projects/jquery-misc-plugins/#serializeobject but the problem with them is that, while they otherwise work fine, for some reason if there are checkboxes in Form B, the checkbox values of Form B are parsed incorrectly and result in null values and loss of data. That would look like this:
var postData = $(this.form).serializeObject();
var items = $('.item-selector:checked').map(function(){
return this.value;
}).get();
if(items.length > 0) {
postData.itemId = items;
}
Using JSON.stringify revealed the object structure to be like this:
{
"name":"Simon J. Kok",
"address_id":"39669",
"email":"*****",
"content_id":"21921",
"client_id":"42101",
"is_ebill":["","1"], <-- this is a checked checkbox
"is_banned":"", <-- this is an unchecked checkbox
"button":"save"
}
The checkboxes in Form B look like
<input type="checkbox" value="1" name="is_ebill" />
<input type="checkbox" value="1" name="is_banned" />
So what I need is either some insight on how to add the checkboxes from Form A to the $.serializeArray() result array -OR- a way to solve the issue of a checked checkbox returning an array when using Ben Alman's plugin.

Here's one approach. First it requires a hidden field in form-b:
<input type="hidden" id="itemId" name="itemId" value="" />
This would be populated with the item-selector data when the form is submitted:
$('#form-b').on('submit', function() {
var checkedValues = [];
$('.item-selector:checked').each(function() {
checkedValues.push($(this).val());
});
$('#itemId').val(checkedValues.join(','));
console.debug('Form B data:', $('#form-b').serializeArray());
});
Adjust the syntax to suit your idiom. Here's a fiddle to demonstrate:
http://jsfiddle.net/klenwell/12evxfvc/

Actually I kinda answered my own question already when I asked it. I used JSON.Stringify to output the JSON formatted string of what $.serializeArray() returned and it became apparent what the structrure needed to work. So here is how to add array values one by one to an array retrieved using $.serializeArray():
var items = $('.item-selector:checked').map(function(){
return this.value;
}).get();
$.each(items, function(i, v){
postData.push({name: 'itemId[]', value: v});
});

check checkbox if another checkbox is checked

I want the checkbox with the value 2 to automatically get checked if the checkbox with the value 1 is checked. Both have the same id so I can't use getElementById.
html:
<input type="checkbox" value="1" id="user_name">1<br>
<input type="checkbox" value="2" id="user_name">2
I tired:
var chk1 = $("input[type="checkbox"][value="1"]");
var chk2 = $("input[type="checkbox"][value="2"]");
if (chk1:checked)
chk2.checked = true;

You need to change your HTML and jQuery to this:
var chk1 = $("input[type='checkbox'][value='1']");
var chk2 = $("input[type='checkbox'][value='2']");
chk1.on('change', function(){
chk2.prop('checked',this.checked);
});
id is unique, you should use class instead.
Your selector for chk1 and chk2 is wrong, concatenate it properly using ' like above.
Use change() function to detect when first checkbox checked or unchecked then change the checked state for second checkbox using prop().
Fiddle Demo

Id should be unique, so that set different ids to your elements, By the way you have to use .change() event to achieve what you want.
Try,
HTML:
<input type="checkbox" value="1" id="user_name1">1<br>
<input type="checkbox" value="2" id="user_name2">2
JS:
var chk1 = $("input[type='checkbox'][value='1']");
var chk2 = $("input[type='checkbox'][value='2']");
chk1.change(function(){
chk2.prop('checked',this.checked);
});

You need to change the ID of one. It is not allowed by W3C standard (hence classes vs ID's). jQuery will only process the first ID, but most major browsers will treat ID's similar to classes since they know developers mess up.
Solution:
<input type="checkbox" value="1" id="user_name">1<br>
<input type="checkbox" value="2" id="user_name_2">2
With this JS:
var chk1 = $('#user_name');
var chk2 = $('#user_name2');
//check the other box
chk1.on('click', function(){
if( chk1.is(':checked') ) {
chk2.attr('checked', true);
} else {
chk2.attr('checked', false);
}
});
For more information on why it's bad to use ID's see this: Why is it a bad thing to have multiple HTML elements with the same id attribute?

The error is probably coming here "input[type="checkbox"]
Here your checkbox is out of the quotes, so you query is looking for input[type=][value=1]
Change it to "input[type='checkbox'] (Use single quote inside double quote, though you don't need to quote checkbox)
http://api.jquery.com/checked-selector/

first create an input type checkbox:
<input type='checkbox' id='select_all'/>
$('#select_all').click(function(event) {
if(this.checked) {
$(':checkbox').each(function() {
this.checked = true;
});
}
});

JS / JQuery - Check All Checkboxes

I have a photo gallery. Underneath each photo is a checkbox, with the ID containing a prefix of 'checkbox_', followed by the photo ID.
<input type="checkbox" id="checkbox_<%=photoID%>" name="photos">
When I check a 'selectAll' checkbox, like this one:
<input type="checkbox" id="toggleAll" name="toggleAll" onclick="toggleAll()">
I want to check/uncheck all checkboxes that have the name 'photos', so I have this function that should do that... but it doesn't:
function toggleAll() {
if (document.getElementById('toggleAll').checked == true)
{
$('.photoBlob').animate({backgroundColor: 'rgba(0,102,204,0.5)'}, 500);
$('.photoBlob').animate({backgroundColor: 'rgba(204,204,204,1)'}, 1500);
document.getElementByName('photos').checked = true;
}
else
{
$('.photoBlob').animate({backgroundColor: 'rgba(0,0,0,0)'}, 1000);
document.getElementByName('photos').checked = false;
}
}
The rest of the function works okay, it animates the background colors of the containing DIV (#photoBlob) when the toggleALL() function is called. But, I really can't get all the checkboxes to check and I have tried so many different variations!
Can anybody see what I am doing wrong? The problem lies with these two lines:
document.getElementByName('photos').checked = true;
document.getElementByName('photos').checked = false;
Any suggestions gratefully received...

You can do like this,
don't use same name for several check boxes because the name shroud be unique. Instead of use the class.
<input type="checkbox" id="checkbox_<%=photoID%>" class="photos">
an the jquery,
$('#toggleAll').click(function(){
var checked =$(this).attr('checked');
$('.photos').attr('checked', checked);
}

$('#toggleAll').click(function(){
$(':checkbox[name="photos"]').prop('checked',this.checked);
});
Fiddle demo: http://jsfiddle.net/uNeX2/

I think you're missing an "s" in getElementByTagName. Try getElementsByTagName.
This might also work:
$("#toggleAll").click(function() {<br/>
$("input[name='photos']").attr("checked",!!$(this).attr("checked"));
});

well, since you said, you have multiple checkboxes with the name 'photos', selecting only one element by using the function getElementByName, can't be ur choice of game. Using jQuery simplifies the task your trying to do;
$("input[name=photos]").each(function(elem){
elem.checked=true;
}
or simpler;
$("input[name=photos]").attr('checked','checked');
its its js-only, youd need to select all input elements via getElementsByTagName and then filter out the ones that don't comply with having a name of 'photos'.. and then do your task.

Here is simple example using jQuery:
html
<input type="checkbox" id="all" >
<input type="checkbox" name="photo" >
<input type="checkbox" name="photo" >
<input type="checkbox" name="photo" >
<input type="checkbox" name="photo" >
js
$('#all').click(function() {
if ($(this).attr('checked') == undefined) {
$('input[name=photo]').removeAttr('checked');
}
else {
$('input[name=photo]').attr('checked', 'checked');
}
});
Code: http://jsfiddle.net/b8Y9t/3/

I would use:
$('.photos:checkbox').attr('checked','checked');

There is no function called getElementByName. Did you have a javascript-error? I think it should be getElementsByName. This returns a list with elements. That means you have to loop trough it to check all checkboxes.
BTW I think it is not correct to use a name called 'photos' for a checkbox, since a checkbox is a single object and does not display a photo itself. I would name it 'photoCheckbox' or 'cbPhoto' to clearify it is a checkbox.
var checkboxList = getElementsByName('photoCheckbox'); // returns list with checkboxes with name 'photoCheckbox'
if (checkboxList)
{
for (var i = 0; i < checkboxList.length; i++)
{
var checkbox = checkboxList[i];
checkbox.checked = false;
}
}
Thats how the getElementsByName function works. So if you would evaluate this method, you would say this is unnecessary since you are already using jQuery? I would simplify the code of the checkbox:
<input type="checkbox" onclick="toggleAll(this)" />
The new toggleAll function looks like this:
function toggleAll(checkbox)
{
if (checkbox.checked)
{
$('.photoBlob').animate({backgroundColor: 'rgba(0,102,204,0.5)'}, 500);
$('.photoBlob').animate({backgroundColor: 'rgba(204,204,204,1)'}, 1500); // btw why 2 animations on the same elements..?
$('input[name="photos"]').prop("checked", true);
}
else
{
$('.photoBlob').animate({backgroundColor: 'rgba(0,0,0,0)'}, 1000);
$('input[name="photos"]').prop("checked", false);
}
}

// jquery check all or uncheck all
$('.checkall').click(function(){
var status = 'false';
status = $('.checkall').is(":checked");
//alert ('status is ' + status); // you should see true or false
$('.metacheckbox').each( function() {
$(this).attr('checked', status);
});
});
<input class="checkall" type="checkbox" />Check/UnCheck All
<input class="metacheckbox" type="checkbox" id='checkboxone' name="checkboxone" value="Y" />
<input class="metacheckbox" type="checkbox" id='checkboxtwo' name="checkboxtwo" value="Y" />
<input class="metacheckbox" type="checkbox" id='checkboxthree' name="checkboxthree" value="Y" />
this worked for me.

javascript print array values dynamic

hi everyone i have a problem in javascript i can print array if fix them in html but whn i try to print them on clic they are not working just print the array names
if i print seriesre simple it print values that is fine but when i check any checkbox and want to print one or tow of them it just showing array name not values
thanks for help
check this example
$(document).ready(function() {
Comment = [['2011-01-29',7695],['2011-02-02',19805]];
WallPost = [['2011-01-29',11115],['2011-02-02',8680]];
Likes = [['2011-01-29',5405],['2011-02-02',10930]];
var seriesre= [Comment,WallPost,Likes];
var mygraphs = new Array();
alert(seriesre);
$("#testCheck").click(function() {
i=0;
$("#testCheck :checked").each(function() {
mygraphs[i]= $(this).val();
i++;
});
newseriesre = "["+mygraphs+"]";
alert(newseriesre);
});
});
<div class="activity">
<form method="POST" id="testCheck" name="myform">
Likes
<input type="checkbox" value="Likes" name="box2">
Comments
<input type="checkbox" value="Comment" name="box3">
Wall Post
<input type="checkbox" value="WallPost" name="box4">
</form>
</div>

You can use
alert(myarray.join())
to alert your array's values

You should use a associative array instead of an array, so that you can look up the data based on the name as a string instead of trying to find the variable. All objects in Javascript are associative arrays, so just put the data in an object.
Also:
Create the mygraphs array inside the event handler, otherwise it can not shrink when you uncheck options.
Catch the click on the checkboxes inside the form, not on the form itself.
Put a label tag around the checkbox and it's label, that way the label is also clickable.
You don't need an index variable to put values in the mygraphs array, just use the push method to add items to it.
http://jsfiddle.net/cCukJ/
Javascript:
$(function() {
Comment = [['2011-01-29',7695],['2011-02-02',19805]];
WallPost = [['2011-01-29',11115],['2011-02-02',8680]];
Likes = [['2011-01-29',5405],['2011-02-02',10930]];
var seriesre = {
'Comment': Comment,
'WallPost': WallPost,
'Likes': Likes
};
$("#testCheck :checkbox").click(function() {
var mygraphs = [];
$("#testCheck :checked").each(function() {
mygraphs.push(seriesre[$(this).val()]);
});
alert("["+mygraphs+"]");
});
});
HTML:
<div class="activity">
<form method="POST" id="testCheck" name="myform">
<label>
Likes
<input type="checkbox" value="Likes" name="box2">
</label>
<label>
Comments
<input type="checkbox" value="Comment" name="box3">
</label>
<label>
Wall Post
<input type="checkbox" value="WallPost" name="box4">
</label>
</form>
</div>

I understand that you want to alert the selected values when clicking anywhere on the form? If that's true correct code with minimal changes to your existing code will be:
var mygraphs = [];
$("#testCheck").click(function() {
$("#testCheck :checked").each(function() {
mygraphs.push($(this).val());
});
alert("Selected values are: " + mygraphs.join(", "));
});

You can try this.
alert($("#testCheck :checked")
.map( function(i, field) { return field.value}
).get());
Check your working example in http://jsfiddle.net/dharnishr/d37Gn/