html - How to get class name through JavaScript? -

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how class name through javascript using element name classic html.

like:

<input name="xxx" class="checkbox" onchange="checkonchange()"        type="checkbox" checked="" value="y">

i want check fields has class name "checkbox" .

how can solve this? please me.

there lot of solutions. first access element classname use code : 

element.classname

next if want test if classname exist inside element list, can test indexof have false positive. class "foo" not present in following element.classname : "foobar foobuzz"

best way use regexp : 

checkifelementhasclassname(element, classname) {    return (new regexp('^|\\s' + classname + '\\s|$')).test(element.classname); }

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