javascript - How to determine whether floated element has wrapped -

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i have 4 divs. of them float:left; example, can be:

[div id=1][div id=2][div id=3][div id=4]

or

[div id=1][div id=2][div id=3]
[div id=4]

in second case last div put next line there no space in parent. how can check if div id=4 next line. pure js or jquery. please, help.

there no easy way, have check position. comparing bottom value of element top value of element b safest method because errors can occur , top value isn't alway same.

this code check if div 4 in other line div 1 :

var = $('#1'), b = $('#4');  var posa = a.offset().top + a.height(), posb = b.offset().top;  if(posb > posa){     //div 4 in other line. }

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