javascript - Get id of an element through a function -

i have function called in onclick event in checkbox field.

<input type='checkbox' checked='' onclick='return changeenable();' id='someid'> 

and function

function changeenable() {     var val = $(this).attr('id');     alert(val); } 

i have returns undefined. syntax wrong or did miss something?

those checkboxes dynamically created , have different id's, that's why want id task.

note this in changeenable function window. need pass reference element parameter function:

<input type='checkbox' checked='' onclick='return changeenable(this);' id='someid'> 

function changeenable(el) {     var val = el.id     alert(val); } 

or, improvement, use javascript attach events better separation of concerns:

<input type="checkbox" id="someid"> 

$(function() {     $('#someid').change(function() {         var val = this.id         alert(val);     } }); 

note above uses change event of checkbox, better accessibility reasons.