Checkbox Object
Checkboxes (<input type="checkbox">) within your form can be accessed and manipulated using
JavaScript via the corresponding Checkbox object. There are two ways to access a
checkbox, depending on whether it it unique in the form (distinct name), or part
of a group of checkboxes, all sharing the same name.
Distinct Name:
document.myform.mycheck //where myform and mycheck are
names of your form/element.
document.myform.elements[i] //where i is the position of the checkbox within form
Shared Names (part of a group of checkboxes):
document.myform.mycheck[i] //where i is the position of the checkbox
within the group of checkboxes.
Events
|
Events |
Description |
| onBlur |
Code is executed when the focus is
removed from the checkbox. |
| onClick |
Code is executed when user clicks on
the checkbox. |
| onFocus |
Code is executed when the focus is set
on the checkbox. |
Properties
|
Properties |
Description |
|
accessKey |
String value that sets/ returns the accessKey for
the checkbox. |
|
checked |
Boolean property that reflects the
current state of the checkbox, "true" if it's checked, and "false"
if not. Example(s) |
|
defaultChecked |
Boolean property that reflects the
value of the CHECKED attribute. |
|
disabled |
Boolean value that sets/ returns whether the
checkbox is disabled. |
|
form |
References the form that contains the
checkbox. |
|
name |
Reflects the name of the checkbox (the name attribute). |
|
type |
A property available on all form
elements, "type" returns the type of the calling form element, in
this case, "checkbox". |
|
value |
A read/write string that specifies the
value of the checkbox (the value attribute). |
Methods
|
Methods |
Description |
|
blur() |
Removes focus away from the checkbox. |
|
click() |
Simulates a user clicking on the
checkbox. |
|
focus() |
Sets focus on the checkbox. |
Examples
checked
This example loops through a group of checkboxes all sharing the same name,
and alerts a message if one is found to be checked:
<form name="test">
<input type="checkbox" name="checkgroup" checked />
<input type="checkbox" name="checkgroup" />
<input type="checkbox" name="checkgroup" checked />
</form>
<script type="text/javascript">
for (i=0; i<document.test.checkgroup.length; i++){
if (document.test.checkgroup[i].checked==true)
alert("Checkbox at index "+i+" is checked!")
}
</script>
Checkbox Object
View Source...
Checkboxes within your form can be accessed and manipulated using JavaScript via the corresponding Checkbox object.
