check and uncheck boxes in javascript
Question
I have a script that checks and check all boxes in a form, my problem is that I only want it to affect only my checkboxes but it also affecting my radio buttons.
This is my javascript
<script>
checked=false;
function checkedAll (frm1) {
var aa= document.getElementById('frm1');
if (checked == false)
{
checked = true
}
else
{
checked = false
}
for (var i =0; i < aa.elements.length; i++)
{
aa.elements[i].checked = checked;
}
}
</script>
This is my html
<form id ="frm1">
<input type="checkbox" name="chk1">
<input type="radio" name="chk1">
<input type="checkbox" name="chk2">
<input type='checkbox' name='checkall' onclick='checkedAll(frm1);'>
</form>
I was wondering whether there was a way to check only the checkboxes not the radio button.
3 answers
solution1
3 ACCPTED 2012-08-16 18:38:58
for (var i =0; i < aa.elements.length; i++)
{
if (aa.elements[i].type == "checkbox") {
aa.elements[i].checked = checked;
}
}
solution2
0 2012-08-16 18:42:39
You can loop through the form elements and check for the "type" property. Alternately, you can use a javascript library like jQuery, which makes it easier to select elements of certain type.
var elLength = document.MyForm.elements.length;
for (i=0; i<elLength; i++)
{
var type = MyForm.elements[i].type;
if (type=="checkbox" && MyForm.elements[i].checked){
alert("Form element in position " + i + " is of type checkbox and is checked.");
}
else if (type=="checkbox") {
alert("Form element in position " + i + " is of type checkbox and is not checked.");
}
else {
}
}
In jQuery it would be:
$("input[type='checkbox']).each(function(chk) {
chk.checked = !chk.checked;
});
solution3
0 2012-08-16 19:00:59
You can use jquery . use the html code below in your editor. it works correctly!
<html>
<head>
<script type="text/javascript" src="http://code.jquery.com/jquery-1.8.0.js"> </script>
</head>
<form id="myform">
<input type="checkbox" />chk1
<input type="checkbox" />chk2<br/>
<input type="radio" />radio1<br/>
<a style="cursor:pointer" onclick="ch()">check/uncheck</a>
</form>
</body></html>
and this script:
<script>
function ch(){
$("form#myform input[type='checkbox']").each(function(chk) {
this.checked = !this.checked;
});
}
</script>
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