How to set manual default image, if image is not available on my site using js?

Question

I want to set manual dummy image if particular image is not available on website. Also how to set if that image is deleted on server or not available, in that case also i need to display default image using JS.

Answer 1

This is cross-browser, vanilla JavaScript and comes along without any ugly onerror="" markup:

var sPathToDefaultImg = 'http://lorempixel.com/150/100/abstract/2/Placeholder/';

var replaceImageWithPlaceholderIfNotAvail = function( domImg ) {

  // sanitize domImg
  if ( !domImg || !domImg.nodeName || domImg.nodeName != 'IMG' ) {
    // get all images from DOM
    aImg = document.getElementsByTagName('IMG');
    i    = aImg.length;
    if ( i ) {
      while ( i-- ) {
        replaceImageWithPlaceholderIfNotAvail( aImg[i] );
      }
    }
    return;
  }

  // here is where the magic happens
  oImg         = new Image();       // create new Image
  oImg.onerror = function() {       // assign onerror
    domImg.src = sPathToDefaultImg; // handler function
  };
  oImg.src     = domImg.src;        // set src of new Image

};

// now you can use the function on "auto pilot"
replaceImageWithPlaceholderIfNotAvail()

// or feed with any domImage you like to evaluate
// replaceImageWithPlaceholderIfNotAvail( domCustomImg )

Available: <img src="http://cdn.sstatic.net/stackexchange/img/logos/so/so-logo-med.png" alt="notavail1.jpg"><br>

Not Available: <img src="notavail1.jpg" alt="notavail2.jpg"><br>

Available: <img src="http://cdn.sstatic.net/stackexchange/img/logos/so/so-logo-med.png" alt="notavail1.jpg"><br>

Not Available: <img src="notavail2.jpg" alt="notavail4.jpg">

CODEPEN: