Check if an image is loaded no errors with jQuery

Question

I m using JavaScript with the jQuery library to manipulate image thumbnails contained in a unordered list  When the image is loaded it does one thing  when an error occurs it does something else  I m using jQuery load   and error   methods as events  After these events I check the image DOM element for the  complete to make sure the image wasn t already loaded before jQuery could register the events   It works correctly except when an error occurs before jQuery can register the events  The only solution I can think of is to use the img onerror attribute to store a  flag  somewhere globally  or on the node it s self  that says it failed so jQuery can check that  store node  when checking  complete   Anyone have a better solution   Edit  Bolded main points and added extra detail below  I m checking if an image is complete  aka loaded  AFTER I add a load and error event on the image  That way  if the image was loaded before the events were registered  I will still know  If the image isn t loaded after the events then the events will take care of it when it does  The problem with this is  I can easily check if an image is loaded already  but I can t tell if an error occurred instead

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Realtime network detector - check network status without refreshing the page   it s  not jquery  but tested  and 100  works  tested on Firefox v25 0    Code    lt script gt   function ImgLoad myobj      var randomNum   Math round Math random     10000      var oImg new Image     oImg src  YOUR IMAGELINK    rand   randomNum     oImg onload function   alert  Image succesfully loaded        oImg onerror function   alert  No network connection or image is not available       window onload ImgLoad     lt  script gt    lt button id  reloadbtn  onclick  ImgLoad     gt Again  lt  button gt    if connection lost just press the Again button   Update 1  Auto detect without refreshing the page    lt script gt       function ImgLoad myobj          var randomNum   Math round Math random     10000          var oImg new Image         oImg src  YOUR IMAGELINK    rand   randomNum         oImg onload function   networkstatus div innerHTML             oImg onerror function   networkstatus div innerHTML  Service is not available  Please check your Internet connection        networkchecker   window setInterval function   window onload ImgLoad    1000    lt  script gt    lt div id  networkstatus div  gt  lt  div gt

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var isImgLoaded   function imgSelector     return   imgSelector  prop  complete    amp  amp    imgSelector  prop  naturalWidth       0         Or As a Plugin        fn extend         isLoaded  function            return this prop  complete    amp  amp  this prop  naturalWidth       0                         myImage   isLoaded

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This snippet of code helped me to fix browser caching problems       my image   on  load   function          console log  image loaded correctly        each function           if   this  prop  complete      this  load          When the browser cache is disabled  only this code doesn t work       my image   on  load   function          console log  image loaded correctly          to make it work you have to add    each function          if   this  prop  complete      this  load

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After reading the interesting solutions on this page  I created an easy-to-use solution highly influenced by SLaks  and Noyo s post that seems to be working on pretty recent versions  as of writing  of Chrome  IE  Firefox  Safari  and Opera  all on Windows   Also  it worked on an iPhone iPad emulator I used   One major difference between this solution and SLaks and Noyo s post is that this solution mainly checks the naturalWidth and naturalHeight properties  I ve found that in the current browser versions  those two properties seem to provide the most helpful and consistent results   This code returns TRUE when an image has loaded fully AND successfully  It returns FALSE when an image either has not loaded fully yet OR has failed to load   One thing you will need to be aware of is that this function will also return FALSE if the image is a 0x0 pixel image  But those images are quite uncommon  and I can t think of a very useful case where you would want to check to see if a 0x0 pixel image has loaded yet     First we attach a new function called  isLoaded  to the HTMLImageElement prototype  so that the function can be used on any image element   HTMLImageElement prototype isLoaded   function             See if  naturalWidth  and  naturalHeight  properties are available      if  typeof this naturalWidth     number   amp  amp  typeof this naturalHeight     number           return   this naturalWidth    0  amp  amp  this naturalHeight    0           See if  complete  property is available      else if  typeof this complete     boolean           return this complete          Fallback behavior  return TRUE      else         return true        Then  any time we need to check the loading status of the image  we just call the  isLoaded  function   if  someImgElement isLoaded             YAY  The image loaded   else          Image has not loaded yet     Per giorgian s comment on SLaks  and Noyo s post  this solution probably can only be used as a one-time check on Safari Mobile if you plan on changing the SRC attribute  But you can work around that by creating an image element with a new SRC attribute instead of changing the SRC attribute on an existing image element

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This one worked fine for me         progress-image   each function        var img   new Image        img onload   function             let imgSrc     this  attr  src                progress-image   each function                if   this  attr  src      imgSrc                   console log   this  parent   closest   real-pack   parent   find   shimmer   fadeOut                                       img src     this  attr  src

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Using this JavaScript code you can check image is successfully loaded or not   document onready   function e            var imageobj   new Image            imageobj src   document getElementById  img-id   src          if  imageobj complete                alert imageobj src    -  Not Found                  Try out this

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I tried many different ways and this way is the only one worked for me    check all images on the page    img   each function        var img   new Image        img onload   function             console log   this  attr  src       - done               img src     this  attr  src          You could also add a callback function triggered once all images are loaded in the DOM and ready  This applies for dynamically added images too  http   jsfiddle net kalmarsh80 nrAPk

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Another option is to trigger the onload and or onerror events by creating an in memory image element and setting its src attribute to the original src attribute of the original image   Here s an example of what I mean       lt img  gt         on  load   function     console log  image loaded correctly            on  error   function     console log  error loading image            attr  src     originalImage  attr  src        Hope this helps

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Based on my understanding of the W3C HTML Specification for the img element  you should be able to do this using a combination of the complete and naturalHeight attributes  like so   function imgLoaded imgElement      return imgElement complete  amp  amp  imgElement naturalHeight     0      From the spec for the complete attribute      The IDL attribute complete must return true if any of the following   conditions is true          The src attribute is omitted    The final task that is queued by the networking task source once the resource has been fetched has been queued    The img element is completely available    The img element is broken          Otherwise  the attribute must return false    So essentially  complete returns true if the image has either finished loading  or failed to load  Since we want only the case where the image successfully loaded we need to check the nauturalHeight attribute as well      The IDL attributes naturalWidth and naturalHeight must return the   intrinsic width and height of the image  in CSS pixels  if the image   is available  or else 0    And available is defined like so      An img is always in one of the following states          Unavailable - The user agent hasn t obtained any image data    Partially available - The user agent has obtained some of the image data    Completely available - The user agent has obtained all of the image data and at least the image dimensions are available    Broken - The user agent has obtained all of the image data that it can  but it cannot even decode the image enough to get the image   dimensions  e g  the image is corrupted  or the format is not   supported  or no data could be obtained           When an img element is either in the partially available state or in   the completely available state  it is said to be available    So if the image is  broken   failed to load   then it will be in the broken state  not the available state  so naturalHeight will be 0   Therefore  checking imgElement complete  amp  amp  imgElement naturalHeight     0 should tell us whether the image has successfully loaded   You can read more about this in the W3C HTML Specification for the img element  or on MDN

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I had a lot of problems with the complete load of a image and the EventListener   Whatever I tried  the results was not reliable   But then I found the solution  It is technically not a nice one  but now I never had a failed image load   What I did                       document getElementById currentImgID  addEventListener  load   loadListener1                       document getElementById currentImgID  addEventListener  load   loadListener2                    function loadListener1                                                Load again                                        function loadListener2                                         var btn   document getElementById  addForm WithImage    btn disabled   false                      alert  Image loaded                        Instead of loading the image one time  I just load it a second time direct after the first time and both run trough the eventhandler   All my headaches are gone     By the way  You guys from stackoverflow helped me already more then hundred times  For this a very big Thank you

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Check the complete and naturalWidth properties  in that order   https   stereochro me ideas detecting-broken-images-js  function IsImageOk img           During the onload event  IE correctly identifies any images that        weren   t downloaded as not complete  Others should too  Gecko-based        browsers act like NS4 in that they report this incorrectly      if   img complete            return false                However  they do have two very useful properties  naturalWidth and        naturalHeight  These give the true size of the image  If it failed        to load  either of these should be zero      if  img naturalWidth     0            return false                No other way of checking  assume it   s ok      return true

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This is how I got it to work cross browser using a combination of the methods above  I also needed to insert images dynamically into the dom        domTarget   html   lt img src      gt      var url     some image path png        domTarget img   load function      attr  src   url  error function         if   isIE            var thisImg   this         setTimeout function               if     thisImg complete                    thisImg  attr  src     web css img picture-broken-url png                         250         else            this  attr  src     web css img picture-broken-url png                Note  You will need to supply a valid boolean state for the isIE variable

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As I understand the  complete property is non-standard   It may not be universal    I notice it seem to work differently in Firefox verses IE   I am loading a number of images in javascript then checking if complete   In Firefox  this seems to work great   In IE  it doesn t because the images appear to be loading on another thread   It works only if I put a delay between my assignment to image src and when I check the image complete property     Using image onload and image onerror isn t working for me  either  because I need to pass a parameter to know which image I am talking about when the function is called   Any way of doing that seems to fail because it actually seems to pass the same function  not different instances of the same function   So the value I pass into it to identify the image always ends up being the last value in the loop   I cannot think of any way around this problem   On Safari and Chrome  I am seeing the image complete true and the naturalWidth set even when the error console shows a 404 for that image    and I intentionally removed that image to test this   But the above works well for Firefox and IE

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Retrieve informations from image elements on the page Test working on Chrome and Firefox Working jsFiddle  open your console to see the result      img   each function       selecting all image element on the page      var img   new Image   this       creating image element      img onload   function        trigger if the image was loaded         console log   this  attr  src       - done                img onerror   function        trigger if the image wasn t loaded         console log   this  attr  src       - error                img onAbort   function        trigger if the image load was abort         console log   this  attr  src       - abort                img src     this  attr  src       pass src to image object         log image attributes     console log img src       console log img width       console log img height       console log img complete          Note   I used jQuery  I thought this can be acheive on full javascript  I find good information here OpenClassRoom --  this is a French forum

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Use imagesLoaded javascript library  Usable with plain Javascript and as a jQuery plugin  Features   officially supported by IE8  license  MIT dependencies  none weight  minified  amp  gzipped    7kb minified  light    Resources  Project on github  https   github com desandro imagesloaded Official website  http   imagesloaded desandro com  https   stackoverflow com questions 26927575 why-use-imagesloaded-javascript-library-versus-jquerys-window-load imagesloaded javascript library  what is the browser  amp  device support

[javascript] Check if an image is loaded (no errors) with jQuery

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