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Uncheck a Checkbox using Jquery

I have a page with a list of check boxes, when a check box is checked I am updating the number of check boxes selected in side a p tag. This is all working.
The problem I have is when the user selects more than 5 checkboxes I want to use Jquery to unselect it.
This is what I have so far, the first if else works but the first part of the if doe
$("input").click(function () {
if ($("input:checked").size() > 5) {
this.attr('checked', false) // Unchecks it
}
else {
$("#numberOfSelectedOptions").html("Selected: " + $("input:checked").size());
}
});
Any ideas?

Firstly you should use the change event when dealing with checkboxes so that it caters for users who navigate via the keyboard only. Secondly, if the number of selected checkboxes is already 5 or greater you can stop the selection of the current checkbox by using preventDefault(). Try this:
$("input").change(function (e) {
var $inputs = $('input:checked');
if ($inputs.length > 5 && this.checked) {
this.checked = false;
e.preventDefault();
} else {
$("#numberOfSelectedOptions").html("Selected: " + $inputs.length);
}
});
Example fiddle
Note I restricted the fiddle to 2 selections so that it's easier to test.

You need this $(this).prop('checked', false);

You should be saying
$(this).attr('checked', false)
instead of
this.attr('checked', false)

You need this $(this).prop('checked', false);
Also this is a javascript object, if you want to use jquery you should prefer $(this).

Onclick change select options - Javascript

I have two date inputs & one select field. When I select dates if both are same select will become blank & if both dates are different select will show "Please select" option selected. I don't know how to do it in JavaScript.
<script>
$(document).on('click', 'input[id*=dateto]', function() {
if($('#dateto').val == $('#datefrom').val) {
$('#div_option').hide();
return false;
}
});
</script>

Try this code , seems to work
$(document).ready(function(){
$('input[id*=date]').on('change', function(){
if($('#dateto').val() == $('#datefrom').val() ) {
$('#div_option').hide();
return false;
}
});
});
There the demos on https://jsfiddle.net/z2p9w944/

JQuery: How to grab what it is selected in the selector

I have a box with one select with two options.
Depending on the options i need to display a different set of checkboxes.
Depending on what the user choose on the select i will display a set of checkboxes or another.
Here i have made here an example:
http://jsbin.com/acOXisI/20/edit
How can i grab the option selected in the selector?
And subsequently how can i display or not the checkboxes fieldset?
Thank you very much!

The javascript you need is:
// hide the fieldsets on page load
$(".otion1, .otion2").hide();
$("select").change(function() {
var $this = $(this);
if($this.val() === "1") {
$(".otion1").show();
$(".otion2").hide();
} else if($this.val() === "2") {
$(".otion1").hide();
$(".otion2").show();
} else {
$(".otion1, .otion2").hide();
}
});
// prevent hidden checkboxes from being submitted
$("form").submit(function() {
$(this).find("input[type='checkbox']").filter(":hidden").each(function() {
this.checked = false;
});
});
and add some values to your select options:
<option value="1">Option 1</option>
<option value="2">Option 2</option>
See edited demo: http://jsbin.com/acOXisI/23/edit

Try:
jQuery("#selector option:selected").val();
Or to get the text of the option, use text():
jQuery("#selector option:selected").text();
More Info:
http://api.jquery.com/val/
http://api.jquery.com/text/

First off, you shouldn't have duplicate ids on the page.
Also, I'd suggest you put unique input names for all the checkboxes and always submit all of them from a single form (and you'd ignore those you don't need). The functionality you want can be achieved in many ways, one of them being hiding both fieldsets and setting a listener to the select element - you can use the onchange event, and check which one is selected and according to that show the appropriate fieldset.
When you check the submitted data, first check the select value, and then only the appropriate checkboxes.

You have to use jQuery:
$().ready(function(){
$('#selector').change(function(){
value=$(this).find(":selected").text();
console.log(value)
if (value == 'Option 1'){
$('.otion1').show()
$('.otion2').hide()
}
else{
$('.otion1').hide()
$('.otion2').show()
}
})
})
There is your bin cloned and working:
http://jsbin.com/UcaWUCA/1/edit

You can do this with jQuery. Note that hidden fields will still get submitted so they need disabling too:
$(function(){
$("#selector").on("change", function(){
$(".otion1, .otion2").hide().find("input").attr("disabled","disabled");
$("."+$(this).val()).show().find("input").removeAttr("disabled");
});
$("#selector").trigger("change");//run on load
});
http://jsbin.com/aVihIJOr/1/edit

Hi you can use $("#selector").val() to get the selected option.
$("#selector").change(function(){
option = $(this).val();
if(option == 1){
$(".option1").show();
$(".option2").hide();
} else if(option == 2) {
$(".option2").show();
$(".option1").hide();
} else {
$(".option2").hide();
$(".option1").hide();
}
});
Working example:
http://jsbin.com/acOXisI/10/edit?html,js,output

I have added unique Div Ids to your options sets and then have linked them with the exact selected value.
Example:
http://jsbin.com/acOXisI/18/edit
$(document).ready(function(){
$('#selector').change(function(){
value=$(this).find(":selected").val();
if (value == 'option1'){
$('#option1').show();
$('#option2').hide();
}
else if(value == 'option2'){
$('#option1').hide();
$('#option2').show();
}else{
$('#option1').show();
$('#option2').show();
}
});
});

disable a CheckBox depending on dropdownlist

I'm working on a asp.net mvc3 application with DropDownLists and CheckBoxes and so on.
I wrote a javascript to disable a CheckBox if a defined option of a dropdownlist is selected:
$(function() {
$('#dropdownlistId').change(function() {
if (this.value == '1st option') {
$('#checkboxId').attr('disabled', disabled);
} else {
$('#checkboxId').removeAttr('disabled', disabled);
}
});
});
this works fine, but the script reacts only on a change of the dropdownlist
so if '1st option' is on the top of the dropdownlist and so automatically selected as default, the script doesn't disable the checkbox. Only if the user select another option and select '1st option' once again...
Please help me :)
PS: the script also doesn't work if I use my keyboard to switch the dropdownlist options instead of my mouse
So it would be very kind if you could help my to improve the script, because I really can't do javascript :/

$(function() {
var $cb = $('#checkboxId');
$('#dropdownlistId').change(function() {
if (this.value == '1st option') {
$cb.prop('disabled', true);
} else {
$cb.prop('disabled', false);
}
}).trigger('change');
});
The difference in triggering change event after adding halnderl. About your second question - Using keyboard the 'change' event will be triggered when select will lose focus ('blur').

You could do something like this:
function setCheckBox() {
if (this.value == '1st option') {
$('#checkboxId').attr('disabled', disabled);
} else {
$('#checkboxId').removeAttr('disabled', disabled);
}
}
$(function() {
setCheckBox();//do this on load..
$('#dropdownlistId').change(function() {
setCheckBox();//and on change
});
});

When you define your CheckBox control, use disabled attribute to disable it by default. That way it will be disabled already and there is no need to add more javascript to disable it from the get go.
It would look something like this:
#Html.CheckBoxFor(model => model.IsCheckBox, new { #disabled = "true" })

$(function() {
var $cb = $('#checkboxId');
$('#dropdownlistId').change(function() {
if (this.value == '1st option') {
$cb.attr('disabled', disabled);
} else {
$cb.removeAttr('disabled', disabled);
}
}).trigger('change');
});
works like a charm now
thank you guys

Your code seems to be little incorrect depends on your need because your calling the disable function on change of that dropdown list you need to write it in document.ready like this
$(document).ready(function () {if(document.getElementById("dropdownlistId").value="1stoption")
{
document.getElementById('checkboxId').style.visibility = 'hidden';
}
else
{//do something whatever you wish here in else condition
}
}
Hope it helps!!!

Enabling checkbox with different elements

Ok, I've been coding a website for a while now and this the first "insurmountable" problem I haven't found an aswer for, so now I'm turning to you, the experts.
On my form I have three drop-down menus, one textbox and one disabled checkbox. I want it to work so that when a user has selected an option from each drop-down menu and written something on the textbox, the checkbox becomes enabled.
I have found this code when I have been looking for a solution and it's very similar to my problem. However, when I try to add another drop-down menu, it still enables the button when I select an option from the first menu and completely ignores the second menu. I'm sorry, I'm new to Jquery/JavaScript and I just think it should work that way when the class names are same on both menus (jQuery class selector: ('.dropdown')).
I have also found a similar code with textboxes. I just don't know how to combine these codes so it would act the way I want.

See it here: http://jsfiddle.net/JKmkL/109/
$(document).ready(function() {
$('.required').change(function() {
var done=true;
$('.required').each(function(){
if(!$(this).val()){
$('.myCheckBox').prop('disabled',true);
done=false;
return false;
}
});
if(done){$('.myCheckBox').prop('disabled',false);}
});
});
And add class required to the elements.
Edit:
The code above assumes that the default <option> has value="". If not, you can use http://jsfiddle.net/JKmkL/114/
$(document).ready(function() {
$('.required').change(function() {
var done=true;
function quit(){
$('.myCheckBox').prop('disabled',true);
done=false;
return false;
}
$('.required.dropdown').each(function(){
if($(this).children(':selected').hasClass("disablenext")){
return quit();
}
});
$('.required[type=text]').each(function(){
if(!$(this).val()){
return quit();
}
});
if(done){$('.myCheckBox').prop('disabled',false);}
});
});
Edit 2:
If you want to show a div when the checkbox is checked and hide it when the checkbox is disabled, use
JavaScript:
$(document).ready(function() {
$('.required').change(function() {
var done=true;
function quit(){
$('.myCheckBox').prop('disabled',true).removeAttr('checked');
done=false;
$('#div2').addClass('hide');
return false;
}
$('.required.dropdown').each(function(){
if($(this).children(':selected').hasClass("disablenext")){
return quit();
}
});
$('.required[type=text]').each(function(){
if(!$(this).val()){
return quit();
}
});
if(done){$('.myCheckBox').prop('disabled',false);}
});
$('.myCheckBox').click(function(){
$('#div2')[(this.checked?'remove':'add')+'Class']('hide');
});
});
CSS:
.hide{display:none}
See it here: http://jsfiddle.net/JKmkL/133/

I assume that dropdown's default value is value=""
$('#form_submit_button').click(function(){
$('.checkbox').attr('disabled',true);
var all_selected = true;
$('.dropdown').each(function(){
if(!$(this).val())
{
all_selected = false;
}
});
if(!$('#text_box').text())
{
all_selected = false;
}
if(all_selected)
{
$('.checkbox').attr('disabled',false);
}
});

First of all, say the id for the three dropdowns are called d1, d2, and d3; textbox is txt; and checkbox is chk. You can then define a function that determines when the checkbox must be enabled:
function shouldEnableCheckbox() {
var nonEmptyFields = $("#d1,#d2,#d3,#txt").filter(function() {
return this.value;
});
return nonEmptyFields.length == 4;
}
Essentially, you select all 4 elements, filter those that are non-empty, and compare the resulting filtered array with 4. If it is true, it means you should enable the checkbox.
Then, assign the change event handler to all 4 elements, invoke the previous function, and assign the result to the disabled property of the checkbox:
$("#d1,#d2,#d3,#txt").change(function() {
$("#chk").prop("disabled", !shouldEnableCheckbox());
});​
Here's the working DEMO, and another working, more generic DEMO, which uses a class instead of ids to identify the required elements.