JSFiddle - React, Tailwind, and code Playground

by vicky081

HTML

<form name="test">
<input type="checkbox" name="v1"> Peter<br />
<input type="checkbox" name="v1"> Jane<br />
<input type="checkbox" name="v1"> George<br />
</form>

<!-- checkall(name of form, common name of checkbox group, true or false)-->

<a href="javascript:checkall('test','v1',true)">Check All</a><br />
<a href="javascript:checkall('test','v1',false)">Uncheck All</a>

JavaScript

function checkall(formname,checkname,thestate){
var el_collection=eval("document.forms."+formname+"."+checkname)
for (c=0;c<el_collection.length;c++)
el_collection[c].checked=thestate
}