html - javascript addEventListener in for loops uses last variable for event -

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here's code 

    <body>         <div id = "elementbox">         </div> <script> var container = document.getelementbyid("elementbox"); function item_select() { alert("e"); var selected_element = document.getelementsbyclassname("on"); selected_element.classname = "off"; alert(selected_element); } (var = 0; < 20; i++) {     dive = document.createelement("div");     dive.id = i+1;     dive.classname = "off";     if (dive.id === 8) { dive.classname = "on"}     dive.innerhtml = "<p>e</p>;     (function(i) {         dive.addeventlistener("click", function(i) {         document.getelementbyid(i).classname = "on";         item_select();         }, true)     })(i); container.appendchild(dive);

}

</script>      </body> </html>

as can see addeventlistener uses incremented variable (i) change classname of specific div, when event called equal 20. how can avoid ?

no, don't believe going on. have immediate-invocation close value of i.

i think problem i event object:

(function(i) {     dive.addeventlistener("click", function(i) {                                             ^-- should not here         document.getelementbyid(i).classname = "on";         item_select();     }, true) })(i);

it seems click handler sets class on next <div>. consider using dive.nextsibling. avoids need use id , i. it's possible more complex behaviour required maybe having id useful.


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