javascript - JS Image Transition Not Working -


i unable css opacity transition work adding using javascript. please let me know wrong code. http://jsfiddle.net/copperspeed/bvwbb

(function () {         var myimgs = document.getelementbyid('vz0');         var = 0;          function cycle() {              if (i <= 3) {                 var myarray = [                     'http://jsrun.it/assets/t/r/u/o/truot.jpg',                     'http://jsrun.it/assets/6/c/y/s/6cysh.jpg',                     'http://jsrun.it/assets/w/m/r/i/wmriq.jpg',                     'http://jsrun.it/assets/5/q/8/f/5q8fw.jpg'                 ];                  console.log(myarray[0]);                 myimgs.setattribute("src", myarray[i]);                  if (myimgs.style.opacity === '0') {                     console.log('trans');                     myimgs.style.transitionproperty = 'opacity';                     myimgs.style.transitionduration = "1500ms";                  }                 if (myimgs.style.opacity === '1') {                     console.log('opacity-0');                     myimgs.style.opacity = '0';                  }                   i++;                 settimeout(function () {                     cycle();                 }, 3000);

there couple of issues script.

  1. the opacity style doesn't exist on element on initialization. need account in logic
  2. on second pass through, opacity style exist , may 0, condition needs accounted for
  3. your second if statement reverses did in first conditional. statement should in else-if
  4. you cycling 1 image element in/out transition 1 image won't work expected. either need change 2 elements or change transitioning strategy accommodate single element.

demo fiddle - items 1-3 above

code changed 1-3 above:

(function () {     var myimgs = document.getelementbyid('vz0');      var = 0;      function cycle() {         if (i <= 3) {             var myarray = ['http://jsrun.it/assets/t/r/u/o/truot.jpg', 'http://jsrun.it/assets/6/c/y/s/6cysh.jpg', 'http://jsrun.it/assets/w/m/r/i/wmriq.jpg', 'http://jsrun.it/assets/5/q/8/f/5q8fw.jpg'];              myimgs.setattribute("src", myarray[i]);              if (myimgs.style.opacity === '' || myimgs.style.opacity == 0) {                 console.log(myimgs.style.opacity + '0');                 myimgs.style.transitionproperty = 'opacity';                 myimgs.style.transitionduration = "1500ms";                 myimgs.style.opacity = 1;             } else if (myimgs.style.opacity == 1) {                 console.log(myimgs.style.opacity + '2');                 myimgs.style.opacity = 0;             }              i++;             settimeout(function () {                 cycle();             }, 3000);             if (i === 4) {                 = 0;             }         }      }     cycle(); }());

for item #4 above - here refactored version uses 2 img elements manage transition in , out:

demo fiddle 1-4 above

html:

<div class="imgwrapper">     <img src="http://jsrun.it/assets/t/r/u/o/truot.jpg" id="vz0" class="vzimage" alt="first" height="300" width="300" />     <img src="http://jsrun.it/assets/t/r/u/o/truot.jpg" id="vz1" class="vzimage" alt="first" height="300" width="300" /> </div>

css:

.imgwrapper {     position: relative;     height: 300px;     width: 300px; } .vzimage {     opacity:0;     position: absolute;     top: 0; left: 0;     bottom: 0; right: 0; }

script:

(function () {     var myimgs  = document.getelementsbyclassname('vzimage');     var myarray = ['http://jsrun.it/assets/t/r/u/o/truot.jpg',                     'http://jsrun.it/assets/6/c/y/s/6cysh.jpg',                     'http://jsrun.it/assets/w/m/r/i/wmriq.jpg',                     'http://jsrun.it/assets/5/q/8/f/5q8fw.jpg'];      // consider moving .vsimage in stylesheet     for(var j = 0; j < myimgs.length; ++j) {         myimgs[j].style.transitionproperty = 'opacity';         myimgs[j].style.transitionduration = "1500ms";     }      function cycle(i) {         var myarrayidx = % myarray.length;         var imgidx     = % myimgs.length;         var previmgidx = (i-1) % myimgs.length;          myimgs[imgidx].setattribute("src", myarray[myarrayidx]);         myimgs[imgidx].style.opacity = 1;          if(myimgs[previmgidx]) {             myimgs[previmgidx].style.opacity = 0;         }          settimeout(function () {             cycle(i+1);         }, 3000);     }     cycle(0); }());

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