Javascript : Uncheck a different checkbox when one checkbox is Unchecked -

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i know kinda duplicate , trying in different way , re-posting question.

what trying achieve , when "un-check" ospf checkbox .. passive interface check should "uncheched" automatically. i'm trying debug why unchecked not working, no luck. below code. 

ospf <input type="checkbox" name="ospfen" id="ospfen_1" onclick="if(this.unchecked){document.getelementbyid('ospfpassive_1').checked=false;}">&nbsp; passive interface<input type="checkbox" name="ospfpassive" id="ospfpassive_1" onclick="if(this.checked){document.getelementbyid('ospfen_1').checked=true;}"> <br />

i wanted if check passive interface checkbox...the ospf should checked , part of code working fine. "un-check" not working.

thanks in advance

the property unchecked not exists. use check checked :)

ospf <input type="checkbox" name="ospfen" id="ospfen_1" onchange="if(!this.checked){document.getelementbyid('ospfpassive_1').checked=false;}">  passive interface <input type="checkbox" name="ospfpassive" id="ospfpassive_1" onchange="if(this.checked){document.getelementbyid('ospfen_1').checked=true;}"> <br />

here working example :

https://jsfiddle.net/0mn3mprv/


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