Javascript How to loop through ALL DOM elements on a page

Question

I m trying to loop over ALL elements on a page  so I want to check every element that exists on this page for a special class   So  how do I say that I want to check EVERY element

User · Answer

Use    var allElem   document getElementsByTagName       for  var i   0  i  lt  allElem length  i             Do something with all element here

User · Answer

For those who are using Jquery         each function i e  console log i     e

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Andy E  gave a good answer   I would add  if you feel to select all the childs in some special selector  this need happened to me recently   you can apply the method  getElementsByTagName    on any DOM object you want   For an example  I needed to just parse  visual  part of the web page  so I just made this   var visualDomElts   document body getElementsByTagName         This will never take in consideration the head part

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Was looking for same  Well  not exactly  I only wanted to list all DOM Nodes   var currentNode      ni   document createNodeIterator document documentElement  NodeFilter SHOW ELEMENT    while currentNode   ni nextNode          console log currentNode nodeName       To get elements with a specific class  we can use filter function   var currentNode      ni   document createNodeIterator                       document documentElement                        NodeFilter SHOW ELEMENT                       function node                            return node classList contains  toggleable     NodeFilter FILTER ACCEPT   NodeFilter FILTER REJECT                                      while currentNode   ni nextNode          console log currentNode nodeName       Found solution on MDN

User · Answer

i think this is really quick  document querySelectorAll  body body     forEach function e

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Here is another example on how you can loop through a document or an element   function getNodeList elem   var l new Array elem  c 1 ret new Array      This first loop will loop until the count var is stable   for var r 0 r lt c r           This loop will loop thru the child element list       for var z 0 z lt l r  childNodes length z                 Push the element to the return array          ret push l r  childNodes z             if l r  childNodes z  childNodes 0                l push l r  childNodes z   c               IF                   FOR    FOR return ret

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Getting all elements using var all   document getElementsByTagName  quot   quot    for  var i 0  max all length  i  lt  max  i     is ok if you need to check every element but will result in checking or looping repeating elements or text  Below is a recursion implementation that checks or loop each element of all DOM elements only once and append   Credits to  George Reith for his recursion answer here  Map HTML to JSON  function mapDOMCheck html string  json      treeObject         dom   new jsdom JSDOM html string     use jsdom because DOMParser does not provide client-side Window for element access   document   dom window document   element   document querySelector  html         Recurse and loop through DOM elements only once   function treeHTML element  object        var nodeList   element childNodes       if  nodeList    null          if  nodeList length            object element nodeName           IMPT  empty    array for parent node to push non-text recursivable elements  see below           for  var i   0  i  lt  nodeList length  i                console log  quot nodeName quot   nodeList i  nodeName              if  nodeList i  nodeType    3       if child node is   final base-case   text node             console log  quot nodeValue quot   nodeList i  nodeValue               else      else             object element nodeName  push         push    into empty    array where    for recursivable elements             treeHTML nodeList i   object element nodeName  object element nodeName  length - 1                                               treeHTML element  treeObject

User · Answer

from this link         javascript reference   lt html gt   lt head gt   lt title gt A Simple Page lt  title gt   lt script language  JavaScript  gt   lt  -- function findhead1         var tag  tags         or you can use var allElem document all  and loop on it     tags    The tags in the page are       for i   0  i  lt  document all length  i                  tag   document all i  tagName          tags   tags     r    tag            document write tags          -- gt   lt  script gt   lt  head gt   lt body onload  findhead1    gt   lt h1 gt Heading One lt  h1 gt   lt  body gt   lt  html gt    UPDATE EDIT  since my last answer i found better simpler solution  function search tableEvent                clearResults            document getElementById  loading   style display    block            var params    formAction SearchStocks            var elemArray   document mainForm elements          for  var i   0  i  lt  elemArray length i                          var element   elemArray i                var elementName  element name              if elementName   formAction                   continue              params      amp     elementName      encodeURIComponent element value                       params      amp tableEvent     tableEvent            createXmlHttpObject             sendRequestPost http request  Controller  false params            prepareUpdateTableContents     function js to handle the response out of scope for this question

User · Answer

You can try with  document getElementsByClassName  special class

User · Answer

You can pass a   to getElementsByTagName   so that it will return all elements in a page  var all   document getElementsByTagName  quot   quot     for  var i 0  max all length  i  lt  max  i              Do something with the element here    Note that you could use querySelectorAll    if it s available  IE9   CSS in IE8   to just find elements with a particular class  if  document querySelectorAll      var clsElements   document querySelectorAll  quot  mySpeshalClass quot    else        loop through all elements instead  This would certainly speed up matters for modern browsers   Browsers now support foreach on NodeList  This means you can directly loop the elements instead of writing your own for loop  document querySelectorAll      forEach function node           Do whatever you want with the node object        Performance note - Do your best to scope what you re looking for by using a specific selector  A universal selector can return lots of nodes depending on the complexity of the page  Also  consider using document body querySelectorAll instead of document querySelectorAll when you don   t care about  lt head gt  children

User · Answer

As always the best solution is to use recursion   loop document   function loop node          do some thing with the node here     var nodes   node childNodes      for  var i   0  i  lt nodes length  i             if  nodes i                continue                     if nodes i  childNodes length  gt  0               loop nodes i                        Unlike other suggestions  this solution does not require you to create an array for all the nodes  so its more light on the memory  More importantly  it finds more results  I am not sure what those results are  but when testing on chrome it finds about 50  more nodes compared to document getElementsByTagName

[javascript] Javascript: How to loop through ALL DOM elements on a page?

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