Detecting when a div s height changes using jQuery

Question

I ve got a div that contains some content that s being added and removed dynamically  so its height is changing often  I also have a div that is absolutely positioned directly underneath with javascript  so unless I can detect when the height of the div changes  I can t reposition the div below it   So  how can I detect when the height of that div changes  I assume there s some jQuery event I need to use  but I m not sure which one to hook into

User · Answer

You can make a simple setInterval    x000D   x000D  function someJsClass   x000D    x000D    var  resizeInterval   null  x000D    var  lastHeight   0  x000D    var  lastWidth   0  x000D     x000D    this Initialize   function    x000D      var  resizeInterval   setInterval  resizeIntervalTick  200   x000D       x000D     x000D    this Stop   function    x000D      if  resizeInterval    null  x000D        clearInterval  resizeInterval   x000D       x000D     x000D    var  resizeIntervalTick   function      x000D      if    yourDiv  width       lastWidth      yourDiv  height       lastHeight    x000D         lastWidth     contentBox  width    x000D         lastHeight     contentBox  height    x000D        DoWhatYouWantWhenTheSizeChange    x000D        x000D       x000D    x000D   x000D  var class   new someJsClass    x000D  class Initialize    x000D   x000D   x000D    EDIT   This is a example with a class  But you can do something easiest

User · Answer

You can use the DOMSubtreeModified event     something  bind  DOMSubtreeModified        But this will fire even if the dimensions don t change  and reassigning the position whenever it fires can take a performance hit  In my experience using this method  checking whether the dimensions have changed is less expensive and so you might consider combining the two   Or if you are directly altering the div  rather than the div being altered by user input in unpredictable ways  like if it is contentEditable   you can simply fire a custom event whenever you do so   Downside  IE and Opera don t implement this event

User · Answer

This is how I recently handled this problem       your-resizing-div   bind  getheight   function             your-resizing-div   height         function your function to load content           whatever your thing does           your-resizing-div   trigger  getheight        I know I m a few years late to the party  just think my answer may help some people in the future  without having to download any plugins

User · Answer

I wrote a plugin sometime back for attrchange listener which basically adds a listener function on attribute change  Even though I say it as a plugin  actually it is a simple function written as a jQuery plugin   so if you want   strip off the plugin specfic code and use the core functions   Note  This code doesn t use polling   check out this simple demo http   jsfiddle net aD49d     function          var prevHeight       test   height            test   attrchange           callback  function  e                var curHeight     this  height                            if  prevHeight     curHeight                       logger   text  height changed from     prevHeight     to     curHeight                    prevHeight   curHeight                                             resizable          Plugin page  http   meetselva github io attrchange   Minified version   1 68kb    function e  function t   var e document createElement  p   var t false if e addEventListener e addEventListener  DOMAttrModified  function   t true  false  else if e attachEvent e attachEvent  onDOMAttrModified  function   t true   else return false e setAttribute  id   target   return t function n t n  if t  var r this data  attr-old-value   if n attributeName indexOf  style   gt  0  if  r  style   r  style      var i n attributeName split      n attributeName i 0  n oldValue r  style   i 1   n newValue i 1      this prop  style   e camelCase i 1    r  style   i 1   n newValue else n oldValue r n attributeName  n newValue this attr n attributeName  r n attributeName  n newValue this data  attr-old-value  r   var r window MutationObserver  window WebKitMutationObserver e fn attrchange function i  var s  trackValues false callback e noop  if typeof i    function   s callback i else e extend s i  if s trackValues  e this  each function t n  var r    for var i t 0 s n attributes o s length t lt o t    i s item t  r i nodeName  i value e this  data  attr-old-value  r    if r  var o  subtree false attributes true attributeOldValue s trackValues  var u new r function t  t forEach function t  var n t target if s trackValues  t newValue e n  attr t attributeName  s callback call n t      return this each function   u observe this o    else if t    return this on  DOMAttrModified  function e  if e originalEvent e e originalEvent e attributeName e attrName e oldValue e prevValue s callback call this e    else if  onpropertychange in document body  return this on  propertychange  function t  t attributeName window event propertyName n call e this  s trackValues t  s callback call this t    return this    jQuery

User · Answer

You can use this  but it only supports Firefox and Chrome    x000D   x000D    element  bind  DOMSubtreeModified   function      x000D    var  this   this  x000D    var updateHeight   function      x000D      var Height      this  height    x000D      console log Height   x000D       x000D    setTimeout updateHeight  2000   x000D      x000D   x000D   x000D

User · Answer

Use a resize sensor from the css-element-queries library   https   github com marcj css-element-queries  new ResizeSensor jQuery   myElement    function         console log  myelement has been resized          It uses a event based approach and doesn t waste your cpu time  Works in all browsers incl  IE7

User · Answer

There is a jQuery plugin that can deal with this very well   http   www jqui net jquery-projects jquery-mutate-official   here is a demo of it with different scenarios as to when the height change  if you resize the red bordered div   http   www jqui net demo mutate

User · Answer

In response to user007   If the height of your element is changing due to items being appended to it using  append   you shouldn t need to detect the change in height  Simply add the reposition of your second element in the same function where you are appending the new content to your first element   As in   Working Example      class1   click function              class1   append   lt div class  newClass  gt  lt h1 gt This is some content lt  h1 gt  lt  div gt             class2   css  top       class1   offset   top       class1   outerHeight

User · Answer

Pretty basic but works   function dynamicHeight         var height   jQuery     height        jQuery   edito-wrapper   css  height   editoHeight     editoHeightSize     jQuery window  resize function          editoHeightSize

User · Answer

You can use the DOMSubtreeModified event     something  bind  DOMSubtreeModified        But this will fire even if the dimensions don t change  and reassigning the position whenever it fires can take a performance hit  In my experience using this method  checking whether the dimensions have changed is less expensive and so you might consider combining the two   Or if you are directly altering the div  rather than the div being altered by user input in unpredictable ways  like if it is contentEditable   you can simply fire a custom event whenever you do so   Downside  IE and Opera don t implement this event

User · Answer

You can make a simple setInterval    x000D   x000D  function someJsClass   x000D    x000D    var  resizeInterval   null  x000D    var  lastHeight   0  x000D    var  lastWidth   0  x000D     x000D    this Initialize   function    x000D      var  resizeInterval   setInterval  resizeIntervalTick  200   x000D       x000D     x000D    this Stop   function    x000D      if  resizeInterval    null  x000D        clearInterval  resizeInterval   x000D       x000D     x000D    var  resizeIntervalTick   function      x000D      if    yourDiv  width       lastWidth      yourDiv  height       lastHeight    x000D         lastWidth     contentBox  width    x000D         lastHeight     contentBox  height    x000D        DoWhatYouWantWhenTheSizeChange    x000D        x000D       x000D    x000D   x000D  var class   new someJsClass    x000D  class Initialize    x000D   x000D   x000D    EDIT   This is a example with a class  But you can do something easiest

User · Answer

This is how I recently handled this problem       your-resizing-div   bind  getheight   function             your-resizing-div   height         function your function to load content           whatever your thing does           your-resizing-div   trigger  getheight        I know I m a few years late to the party  just think my answer may help some people in the future  without having to download any plugins

User · Answer

You can use the DOMSubtreeModified event     something  bind  DOMSubtreeModified        But this will fire even if the dimensions don t change  and reassigning the position whenever it fires can take a performance hit  In my experience using this method  checking whether the dimensions have changed is less expensive and so you might consider combining the two   Or if you are directly altering the div  rather than the div being altered by user input in unpredictable ways  like if it is contentEditable   you can simply fire a custom event whenever you do so   Downside  IE and Opera don t implement this event

User · Answer

These days you can also use the Web API ResizeObserver  Simple example  const resizeObserver   new ResizeObserver      gt        console log  size changed         resizeObserver observe document querySelector   myElement

User · Answer

You can use this  but it only supports Firefox and Chrome    x000D   x000D    element  bind  DOMSubtreeModified   function      x000D    var  this   this  x000D    var updateHeight   function      x000D      var Height      this  height    x000D      console log Height   x000D       x000D    setTimeout updateHeight  2000   x000D      x000D   x000D   x000D

User · Answer

There is a jQuery plugin that can deal with this very well   http   www jqui net jquery-projects jquery-mutate-official   here is a demo of it with different scenarios as to when the height change  if you resize the red bordered div   http   www jqui net demo mutate

User · Answer

I wrote a plugin sometime back for attrchange listener which basically adds a listener function on attribute change  Even though I say it as a plugin  actually it is a simple function written as a jQuery plugin   so if you want   strip off the plugin specfic code and use the core functions   Note  This code doesn t use polling   check out this simple demo http   jsfiddle net aD49d     function          var prevHeight       test   height            test   attrchange           callback  function  e                var curHeight     this  height                            if  prevHeight     curHeight                       logger   text  height changed from     prevHeight     to     curHeight                    prevHeight   curHeight                                             resizable          Plugin page  http   meetselva github io attrchange   Minified version   1 68kb    function e  function t   var e document createElement  p   var t false if e addEventListener e addEventListener  DOMAttrModified  function   t true  false  else if e attachEvent e attachEvent  onDOMAttrModified  function   t true   else return false e setAttribute  id   target   return t function n t n  if t  var r this data  attr-old-value   if n attributeName indexOf  style   gt  0  if  r  style   r  style      var i n attributeName split      n attributeName i 0  n oldValue r  style   i 1   n newValue i 1      this prop  style   e camelCase i 1    r  style   i 1   n newValue else n oldValue r n attributeName  n newValue this attr n attributeName  r n attributeName  n newValue this data  attr-old-value  r   var r window MutationObserver  window WebKitMutationObserver e fn attrchange function i  var s  trackValues false callback e noop  if typeof i    function   s callback i else e extend s i  if s trackValues  e this  each function t n  var r    for var i t 0 s n attributes o s length t lt o t    i s item t  r i nodeName  i value e this  data  attr-old-value  r    if r  var o  subtree false attributes true attributeOldValue s trackValues  var u new r function t  t forEach function t  var n t target if s trackValues  t newValue e n  attr t attributeName  s callback call n t      return this each function   u observe this o    else if t    return this on  DOMAttrModified  function e  if e originalEvent e e originalEvent e attributeName e attrName e oldValue e prevValue s callback call this e    else if  onpropertychange in document body  return this on  propertychange  function t  t attributeName window event propertyName n call e this  s trackValues t  s callback call this t    return this    jQuery

User · Answer

You can use MutationObserver class   MutationObserver provides developers a way to react to changes in a DOM  It is designed as a replacement for Mutation Events defined in the DOM3 Events specification   Example  source      select the target node var target   document querySelector   some-id        create an observer instance var observer   new MutationObserver function mutations      mutations forEach function mutation        console log mutation type                     configuration of the observer  var config     attributes  true  childList  true  characterData  true        pass in the target node  as well as the observer options observer observe target  config       later  you can stop observing observer disconnect

User · Answer

In response to user007   If the height of your element is changing due to items being appended to it using  append   you shouldn t need to detect the change in height  Simply add the reposition of your second element in the same function where you are appending the new content to your first element   As in   Working Example      class1   click function              class1   append   lt div class  newClass  gt  lt h1 gt This is some content lt  h1 gt  lt  div gt             class2   css  top       class1   offset   top       class1   outerHeight

User · Answer

Use a resize sensor from the css-element-queries library   https   github com marcj css-element-queries  new ResizeSensor jQuery   myElement    function         console log  myelement has been resized          It uses a event based approach and doesn t waste your cpu time  Works in all browsers incl  IE7

User · Answer

You can use MutationObserver class   MutationObserver provides developers a way to react to changes in a DOM  It is designed as a replacement for Mutation Events defined in the DOM3 Events specification   Example  source      select the target node var target   document querySelector   some-id        create an observer instance var observer   new MutationObserver function mutations      mutations forEach function mutation        console log mutation type                     configuration of the observer  var config     attributes  true  childList  true  characterData  true        pass in the target node  as well as the observer options observer observe target  config       later  you can stop observing observer disconnect

User · Answer

These days you can also use the Web API ResizeObserver  Simple example  const resizeObserver   new ResizeObserver      gt        console log  size changed         resizeObserver observe document querySelector   myElement

User · Answer

Pretty basic but works   function dynamicHeight         var height   jQuery     height        jQuery   edito-wrapper   css  height   editoHeight     editoHeightSize     jQuery window  resize function          editoHeightSize

User · Answer

You can use the DOMSubtreeModified event     something  bind  DOMSubtreeModified        But this will fire even if the dimensions don t change  and reassigning the position whenever it fires can take a performance hit  In my experience using this method  checking whether the dimensions have changed is less expensive and so you might consider combining the two   Or if you are directly altering the div  rather than the div being altered by user input in unpredictable ways  like if it is contentEditable   you can simply fire a custom event whenever you do so   Downside  IE and Opera don t implement this event

[javascript] Detecting when a div's height changes using jQuery

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