javascript - Getting error thrown in function with if + && condition -


this function:

 window.addeventlistener("load", function() {      var firstgal = document.queryselector(".containsnext");       var nextb = document.queryselector(".nondynamic");       var displayed = document.getelementsbyclassname('images')[0];       nextb.addeventlistener('click', function() {          if (firstgal.style.opacity == 0 && displayed.style.backgroundimage ==  "url(http://i.dailymail.co.uk/i/pix/2014/03/07/article-2575552-1c1a7b9400000578- 567_964x673.jpg)") {              firstgal.style.transform = "rotatey(360deg)";              firstgal.style.opacity = 1;              firstgal.style.height = "200px";              firstgal.style.width = "500px";              firstgal.style.perspective = "400px";              forwardspain();              }               else {                    firstgal.style.transform = "rotatey(0deg)";                    firstgal.style.opacity = 0;                    firstgal.style.perspective = "400px";                    forwardspain();                   }            });  });

what want test if opacity of firstgal 0 , if background of div ".images"(var = displayed/ dynamically created) has specific backgroundimage css value. run code. code runs fine without condition after "&&", cannot find issue.

when spain button clicked, .images div gets background image set, array. want check backgroundimage style on after spain button clicked. dev tools/console return this:

background-image: url(http://i.dailymail.co.uk/i/pix/2014/03/07/article-2575552-1c1a7b9400000578-567_964x673.jpg);

now error how assigned variable, maybe queryselector better find element, there on .images class. , not sure put "" after backgroundimage == . have tried "url(" + 'http://i.dailymail.co.uk/i/pix/2014/03/07/article-2575552-1c1a7b9400000578-567_964x673.jpg' + ")") well, error:

uncaught typeerror: cannot read property '0' of undefined pen.js:149 uncaught typeerror: cannot read property 'style' of undefined

looks var displayed undefined.

link full code, bit long, sorry that, it's above function doesnt work. line 65.

http://codepen.io/damianocel/pen/gpgglb?editors=001


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