getelementbyid - How to target all classes with javascript. No jQuery -

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i writing responsive program keeps changing width of sertain elements, corresponding other elements have % based width. works fine. ran problem when wanted change images in side div big grand parent of images.

js:

var thebigone = document.getelementbyid('imgpresentation'); var demimages = document.getelementsbyclassname('presentatinthis');  fixtheresponsiveness = setinterval(fixthis,1000); function fixthis() {     demimages.style.width = thebigone.offsetwidth+"px"; }  fixtheresponsiveness();

html:

<div id="imgpresentation" class="imgpresentation">     <div id="slidethemimgpresentation" class="slidethemimgpresentation">         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg1.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg2.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg3.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg4.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg5.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg6.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg7.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg8.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg9.jpg"/>         <img class="presentatinthis" src="img/billeder/xyachtvisit/xyachtbesoeg10.jpg"/>     </div> </div>

it works if replace "class" "id" , "getelementsbyclassname" "getelementbyid" works on first img inside div.

i not wish use jquery, please not suggest $('.presentatinthis')

document.getelementsbyclassname returns nodelist, means have loop on result access , set each node's style

var = demimages.length; while (i--) demimages[i].style.width = thebigone.offsetwidth+"px";

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