checkbox interview questions
Top checkbox frequently asked interview questions
How can I create an HTML checkbox with a label that is clickable (this means that clicking on the label turns the checkbox on/off)?
Source: (StackOverflow)
I am trying to style checkbox using the following:
<input type="checkbox" style="border:2px dotted #00f;display:block;background:#ff0000;" />
But, it is still displaying the default checkbox. How to do it?
Source: (StackOverflow)
There is no way to have a tri-state check button (yes, no, null) in HTML, right?
Are there any simple tricks or work-arounds without having to render the whole thing by oneself?
Source: (StackOverflow)
How can I check if a checkbox in a checkbox array is checked using the id of the checkbox array?
I am using the following code, but it always returns the count of checked checkboxes regardless of id.
function isCheckedById(id) {
alert(id);
var checked = $("input[@id=" + id + "]:checked").length;
alert(checked);
if (checked == 0) {
return false;
} else {
return true;
}
}
Source: (StackOverflow)
I need to check the checked property of a checkbox and perform an action based on the checked property using jQuery.
For example, if the age checkbox is checked, then I need to show a textbox to enter age, else hide the textbox.
But the following code returns false by default:
if($('#isAgeSelected').attr('checked')) {
$("#txtAge").show();
} else {
$("#txtAge").hide();
}
How do I successfully query the checked property?
Source: (StackOverflow)
I'd like to do something like this to tick a checkbox using jQuery:
$(".myCheckBox").checked(true);
or
$(".myCheckBox").selected(true);
Does such a thing exist?
Source: (StackOverflow)
Is there an easy way to use a custom image for a checkbox? I'm looking to duplicate the "starred" behavior of gmail. So I want to have a checkbox that, when checked, is a filled in star. And when unchecked is an empty star. Do I have to use an imageview and do my own logic myself?
Source: (StackOverflow)
I have a function below that I want to only trigger when a checkbox in the same tr is checked. Please tell me what I am doing wrong, the usual methods are not working. Thanks
JS
$(".add_menu_item_table").live('click', function() {
var value_td = $(this).parents('tr').find('td.td_name').text();
if ($('input.checkbox_check').attr(':checked')); {
var newDiv = $('<div class="div_menu_button"></div>');
var showDiv = $('<div id="show'+ "0" + numShow++ +'" class="menu_button_info hidden"></div>');
var toggleTrigger = $('<a id="toggleshow'+ "0" + numToggle++ +'" data-target="#show'+ "0" + numTarget++ +'" class="toggle_trigger actions"> </a><div style="padding:5px"></div>');
var menuForm = $('<form id="menu_edit_form'+ "0" + numForm++ +'" class="menu_creation_form"></form>');
$('#created_buttons_list').append(
newDiv.text(value_td));
newDiv.wrap("<li></li>");
newDiv.append(toggleTrigger);
newDiv.append(showDiv);
showDiv.append(menuForm);
menuForm.html('<label for="navigation_label">Navigation Label</label><input id="navigation_label'+ "0" + numLabelone++ +'" type="text" placeholder="Navigation Label" name="navigation_label"><label for="attribute">Attribute</label><input id="attribute'+ "0" + numLabeltwo++ +'" type="text" type="text" placeholder="Attribute" name="attribute"><label for="url">URL</label><input id="url'+ "0" + numLabelthree++ +'" type="text" type="text" placeholder="URL" name="url"><input type="button" value="Remove" class="button_link remove_button"> <input type="reset" value="Cancel" class="button_link">');
}
});
var numToggle = 0;
var numShow = 0;
var numTarget = 0;
var numForm = 0;
var numLabelone = 0;
var numLabeltwo = 0;
var numLabelthree = 0;
HTML
<table width="316px" border="0" cellspacing="0" cellpadding="0" id="table-data">
<tbody>
<tr>
<td width="20px"><input type="checkbox" style="width:20px;" value="1" name="checkbox"></td>
<td width="200px"><a rel='nofollow' href="/admin/feedbackmanager/sortby/2/sortdesc/0">Page Name</a></td>
<td width="20px"><a rel='nofollow' href="/admin/feedbackmanager/sortby/3/sortdesc/0">Add</a></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">Timeplot</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">Operations Manuals</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">Company Structure</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">CMS Report</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">Test Document</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
<tr>
<td><input type="checkbox" style="width:20px;" value="1" name="checkbox" class="checkbox_check"></td>
<td class="td_name">Test CMS page</td>
<td><input class="add_menu_item_table" name="add_menu_item" value="Add" type="button"></td>
</tr>
</tbody>
</table>
Source: (StackOverflow)
I've got a load of checkboxes that are by default checked. My users will probably uncheck a few of the checkboxes (if any) and leave the rest of them checked. Is there any way to get the checkboxes that are NOT checked in a form post, rather than the ones that are checked?
Source: (StackOverflow)
I already tried all the possible ways, but I still didn't get it working.
I have a modal window with a checkbox I want that when the modal opens, the checkbox check or uncheck should be based on a database value. (I have that already working with others form fields.) I started trying to get it checked but it didn't work.
My html div:
<div id="fModal" class="modal" >
...
<div class="row-form">
<div class="span12">
<span class="top title">Estado</span>
<input type="checkbox" id="estado_cat" class="ibtn">
</div>
</div>
</div>
and the jquery:
$("#estado_cat").prop( "checked", true );
I also tried with attr, and others seen here in the forums, but none seem to work.
Can someone point me the right way?
EDIT:
ok, I'm really missing something here... I can check/uncheck using code if the check box is in the page, but is it's in the modal window, I can't. I tried dozens of different ways...
I have a link that's supposed to open the modal:
and jquery to "listen" the click and execute some operations like filling some text boxes with data coming from database. Everything works like I want but the problem is that I can't set checkbox checked/unchecked using code. help please!
$(function() {
$(".editButton").click(function(){
var id = $(this).data('id');
$.ajax({
type: "POST",
url: "process.php",
dataType:"json",
data: { id: id, op: "edit" },
}).done(function( data ) {
//the next two lines work fine, i.e., it grabs the value from database and fills the textboxes
$("#nome_categoria").val( data['nome_categoria'] );
$("#descricao_categoria").val( data['descricao_categoria'] );
//then I tried to set the checkbox checked (because its unchecked by default) and it does not work
$("#estado_cat").prop("checked", true);
$('#fModal').modal('show');
});
evt.preventDefault();
return false;
});
});
Source: (StackOverflow)
How to use jQuery to get the checked checkboxes values, and put it into a textarea immediately?
Just like this code:
<html>
<head>
</head>
<body>
<div id="c_b">
<input type="checkbox" value="one_name" checked>
<input type="checkbox" value="one_name1">
<input type="checkbox" value="one_name2">
</div>
<textarea id="t"></textarea>
</body>
</html>
If the id="c_d" is updated by Ajax, the below of altCognito's code doesn't work. Is there any good solution?
Source: (StackOverflow)
We all know how to form a checkbox input in HTML:
<input name="checkbox_name" id="checkbox_id" type="checkbox">
What I don't know -- what's the technically correct value for a checked checkbox? I've seen these all work:
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked>
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="on">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="yes">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="checked">
<input name="checkbox_name" id="checkbox_id" type="checkbox" checked="true">
Is the answer that it doesn't matter? I see no evidence for the answer marked as correct here from the spec itself:
Checkboxes (and radio buttons) are on/off switches that may be toggled
by the user. A switch is "on" when the control element's checked
attribute is set. When a form is submitted, only "on" checkbox
controls can become successful. Several checkboxes in a form may share
the same control name. Thus, for example, checkboxes allow users to
select several values for the same property. The INPUT element is used
to create a checkbox control.
What would a spec writer say is the correct answer? Please provide evidence-based answers.
Source: (StackOverflow)
I have a problem with unchecking a checkbox. Have a look at my jsFiddle, where I am attempting:
$("#check2").attr("checked", true);
I use uniform for styling the checkbox and it simply does not work to check/uncheck the checkbox.
Any ideas?
Source: (StackOverflow)