javascript - cant get data From data-n in element -

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i have span :

<span class="span-link" id="2" data-state="true" onclick="javascript: changestate(this.id);">change state</span>

and in javascript function use code value :

function changestate(_thingid) {     alert(_thingid);     var tt = $(this).attr("data-state");     alert(tt);         }

i getting undefinded data-state . test $(this).data("state") , getting undefined .

whats problems?

you referencing id, not object, change this:

var tt = $('#'+_thingid).attr("data-state");

https://jsfiddle.net/6ne5b8zm/


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