Get position offset of element relative to a parent container

Question

I m used to working with jQuery  In my current project however I use zepto js  Zepto doesn t provide a position   method like jQuery does  Zepto only comes with offset     Any idea how I can retrieve the offset of a container relative to a parent with pure js or with Zepto

User · Answer

I got another Solution  Subtract parent property value from child property value     child-div   offset   top -    parent-div   offset   top

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Example  So  if we had a child element with an id of  child-element  and we wanted to get it s left top position relative to a parent element  say a div that had a class of  item-parent   we d use this code   var position       child-element   offsetRelative  div item-parent    alert  left    position left    top    position top     Plugin Finally  for the actual plugin  with a few notes expalaining what s going on       offsetRelative  or  if you prefer  positionRelative   function           fn offsetRelative   function top           var  this     this           var  parent    this offsetParent            var offset    this position            if  top  return offset     Didn t pass a  top  element          else if  parent get 0  tagName     BODY   return offset     Reached top of document         else if   top  parent  length  return offset     Parent element contains the  top  element we want the offset to be relative to          else if  parent 0       top  0   return offset     Reached the  top  element we want the offset to be relative to          else      Get parent s relative offset             var parent offset    parent offsetRelative top               offset top    parent offset top              offset left    parent offset left              return offset                         fn positionRelative   function top           return   this  offsetRelative top            jQuery         Note   You can Use this on mouseClick or mouseover Event     this  offsetRelative  div item-parent

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Warning  jQuery  not standard JavaScript element offsetLeft and element offsetTop are the pure javascript properties for finding an element s position with respect to its offsetParent  being the nearest parent element with a position of relative or absolute Alternatively  you can always use Zepto to get the position of an element AND its parent  and simply subtract the two  var childPos   obj offset    var parentPos   obj parent   offset    var childOffset         top  childPos top - parentPos top      left  childPos left - parentPos left    This has the benefit of giving you the offset of a child relative to its parent even if the parent isn t positioned

User · Answer

Sure is easy with pure JS  just do this  work for fixed and animated HTML 5 panels too  i made and try this code and it works for any brower  include IE 8     lt script type  text javascript  gt      function fGetCSSProperty s  e            try   return s currentStyle   s currentStyle e    window getComputedStyle s  e             catch  x    return null               function fGetOffSetParent s            var a   s offsetParent    document body           while  a  amp  amp  a tagName  amp  amp  a    document body  amp  amp  fGetCSSProperty a   position       static               a   a offsetParent          return a            function GetPosition s            var b   fGetOffSetParent s            return   Left   b offsetLeft   s offsetLeft   Top   b offsetTop   s offsetTop                lt  script gt

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I did it like this in Internet Explorer   function getWindowRelativeOffset parentWindow  elem        var offset             left   0          top   0               relative to the target field s document     offset left   elem getBoundingClientRect   left      offset top   elem getBoundingClientRect   top         now we will calculate according to the current document  this current        document might be same as the document of target field or it may be        parent of the document of the target field     var childWindow   elem document frames window      while  childWindow    parentWindow            offset left   offset left   childWindow frameElement getBoundingClientRect   left          offset top   offset top   childWindow frameElement getBoundingClientRect   top          childWindow   childWindow parent             return offset                           you can call it like this  getWindowRelativeOffset top  inputElement     I focus on IE only as per my focus but similar things can be done for other browsers

User · Answer

Add the offset of the event to the parent element offset to get the absolute offset position of the event   An example    HTMLElement addEventListener  mousedown  function e        var offsetX   e offsetX      var offsetY   e offsetY       if  e target    this        this  is our HTMLElement          offsetX   e target offsetLeft   e offsetX          offsetY   e target offsetTop   e offsetY             When the event target is not the element which the event was registered to  it adds the offset of the parent to the current event offset in order to calculate the  Absolute  offset value   According to Mozilla Web API   The HTMLElement offsetLeft read-only property returns the number of pixels that the upper left corner of the current element is offset to the left within the HTMLElement offsetParent node    This mostly happens when you registered an event on a parent which is containing several more children  for example  a button with an inner icon or text span  an li element with inner spans  etc

User · Answer

in pure js just use offsetLeft and offsetTop properties  Example fiddle  http   jsfiddle net WKZ8P    x000D   x000D  var elm   document querySelector  span    x000D  console log elm offsetLeft  elm offsetTop   x000D  p     position relative  left 10px  top 85px  border 1px solid blue    x000D  span  position relative  left 30px  top 35px  border 1px solid red    x000D   lt p gt  x000D       lt span gt paragraph lt  span gt  x000D   lt  p gt  x000D   x000D   x000D

[position] Get position/offset of element relative to a parent container?

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