如何修复javascript在新的jquery库上不起作用，而在旧版本的jquery库上起作用？

Question

i have this javascript code whhich makes checkbox work as radio

JAVASCRIPT

$(function() {$('input[type=checkbox]').click(function() {
        $('input[type=checkbox]').attr('checked', false);
        $(this).attr('checked', true);
    });
});

HTML

<label title="cat"><input name="" type="checkbox" checked>cat</label>
<label title="dog"><input name="" type="checkbox" >dog</label>
<label title="lion"><input name="" type="checkbox" >lion</label>
<label title="fish"><input name="" type="checkbox" >fish</label>
<label title="turtle"><input name="" type="checkbox" >turtle</label>

Which was working when i was using older jquery library of version 1.8.3 but when i tried to include the newer jquery library of version 1.11.0 , its not working,

how can i fix it ?

here is http://jsfiddle.net/6upmbbf0/

if you change the jquery version on top left to 1.8.3 or lower it works but above 1.8.3 it doesnt.

Answer 1

The correct method to retrieve and update a checkbox's checked state is .prop() . The .attr() simply retrieves or updates the attribute value; it does not necessarily update the underlying state of the input .

---

jQuery Core 1.9 upgrade guide mentions that behavior is changed, which explains why your code worked in jQuery < version 1.9.

Answer 2

Use not() instead of toggling the checkbox 2 times. If you exclude the checked checkbox in the first place, and uncheck the others, it works better.

$('input[type=checkbox]').not($(this)).prop('checked', false);

fiddle: http://jsfiddle.net/6upmbbf0/3/

edit, added suggestion by Salman A to use prop() instead of attr()

Answer 3

Use 'prop' Instead of 'attr' as

replace code

$(function() {$('input[type=checkbox]').click(function() {
        $('input[type=checkbox]').prop('checked', false);
        $(this).prop('checked', true);
    });
});