Asynchronously load images with jQuery

Question

I want to load external images on my page asynchronously using jQuery and I have tried the following     ajax       url   http   somedomain com image jpg       timeout 5000     success  function               error  function r x                But it always returns error  is it even possible to load image like this   I tried to use  load method and it works but I have no idea how I can set timeout if the image is not available  404   How can I do this

User · Answer

AFAIK you would have to do a  load   function here as apposed to the  ajax    but you could use jQuery setTimeout to keep it live  ish    lt script gt     document  ready function        ajaxSetup       cache  false          placeholder   load  PATH TO IMAGE       var refreshId   setInterval function               placeholder   load  PATH TO IMAGE          500        lt  script gt

User · Answer

Using jQuery you may simply change the  src  attribute to  data-src   The image won t be loaded  But the location is stored with the tag  Which I like    lt img class  loadlater  data-src  path to image ext   gt    A Simple piece of jQuery copies data-src to src  which will start loading the image when you need it  In my case when the page has finished loading     document  ready function            loadlater   each function index  element             element  attr  src     element  attr  data-src                   I bet the jQuery code could be abbreviated  but it is understandable this way

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function           if      hdnFromGLMS   0  value     MB9262                 clr   append   lt img src    Images CDAB london jpg  gt               else                   clr   css  display    none                imgIreland   css  display    block                clrIrland   append   lt img src    Images Ireland-v1 jpg  gt

User · Answer

use  load to load your image   to test if you get an error   let s say 404   you can do the following       img id   error function          this  hide        alert  img not loaded        some action you whant here       careful -  error   event will not trigger when the src attribute is empty for an image

User · Answer

No need for ajax  You can create a new image element  set its source attribute and place it somewhere in the document once it has finished loading   var img       lt img   gt    attr  src    http   somedomain com image jpg        on  load   function             if   this complete    typeof this naturalWidth     undefined     this naturalWidth    0                alert  broken image               else                   something   append img

User · Answer

If you just want to set the source of the image you can use this      img   attr  src   http   somedomain com image jpg

User · Answer

IF YOU REALLY NEED TO USE AJAX     I came accross usecases where the onload handlers were not the right choice  In my case when printing via javascript  So there are actually two options to use AJAX style for this   Solution 1  Use Base64 image data and a REST image service  If you have your own webservice  you can add a JSP PHP REST script that offers images in Base64 encoding  Now how is that useful  I came across a cool new syntax for image encoding     lt img src  data image png base64 iVBORw0KGgoAAAANSUhE      gt    So you can load the Image Base64 data using Ajax and then on completion you build the Base64 data string to the image  Great fun     I recommend to use this site http   www freeformatter com base64-encoder html for image encoding     ajax        url    BASE64 IMAGE REST URL        processData   false     always function b64data           IMAGE ID   attr  src    data image png base64   b64data         Solution2    Trick the browser to use its cache  This gives you a nice fadeIn   when the resource is in the browsers cache   var url    IMAGE URL     ajax        url   url       cache  true      processData   false     always function            IMAGE ID   attr  src   url  fadeIn             However  both methods have its drawbacks  The first one only works on modern browsers  The second one has performance glitches and relies on assumption how the cache will be used   cheers  will

User · Answer

This works too     var image   new Image    image src    image url   image onload   function e        functionalities on load       img-container   append image

User · Answer

You can use a Deferred objects for ASYNC loading   function load img async source        return   Deferred  function  task            var image   new Image            image onload   function     task resolve image            image onerror   function     task reject             image src source         promise         when load img async IMAGE URL   done function  image           id  empty   append image         Please pay attention  image onload must be before image src to prevent problems with cache

User · Answer

lt img   gt   attr  src   http   somedomain com image jpg      Should be better than ajax because if its a gallery and you are looping through a list of pics  if the image is already in cache  it wont send another request to server  It will request in the case of jQuery ajax and return a HTTP 304  Not modified  and then use original image from cache if its already there  The above method reduces an empty request to server after the first loop of images in the gallery

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