javascript - 2 window.parent.onscroll calls on page do not work -


i have html page 2 iframes within it. want each iframe display y scroll offset of parent window. 1 iframe works on page load, other not.

the parent html page has iframe embeds. here code running in iframe:

function run(){     document.write("<div id='scrolly' style='float:left;'></div><br>");     scrolly = 'no';     document.getelementbyid("scrolly").innerhtml = scrolly;     window.parent.onscroll = function(){         scrolly = window.parent.pageyoffset;         document.getelementbyid("scrolly").innerhtml = scrolly;     } } run();

the result on load , scroll downwards display like:

iframe1 = 100 iframe2 = no

can call window.parent.onscroll once? doesn't seem right me.

this happening because in both frames, window.parent makes reference same window object, , setting onscroll property/event on same object, twice. means second time around set window.parent.onscroll property, you're overwriting first attempt set event, , you're overwriting second frame's window.document object, why updates contents of elements in second frame.

to overcome issue, can use addeventlistener instead of onscroll:

http://jsfiddle.net/x046o0p7/

function run() {     document.write("<div id='scrolly' style='float:left;'></div><br>");     scrolly = 'no';     document.getelementbyid("scrolly").innerhtml = scrolly;     window.parent.addeventlistener('scroll', function() {         scrolly = window.parent.pageyoffset;         document.getelementbyid("scrolly").innerhtml = scrolly;     }); }

addeventlistener allows set multiple events of same type same element, while .onstuff listeners don't.


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