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  • Problem Hello, I have a problem here. I don’t understand what didn’t work in my function that tries to change the source of displayedImage. My code: var displayedImage = document.querySelector('.displayed-img'); var thumbBar = document.querySelector('.thumb-bar'); btn = document.querySelector('button'); var overlay = document.querySelector('.overlay'); for (var i = 0; i < 5; i++) { var newImage = document.createElement('img'); var path = 'images/pic' + (i + 1).toString() + '.jpg'; newImage.setAttribute('src', path); thumbBar.appendChild(newImage); } var image = document.getElementsByTagName('img'); function sourceAlter(e) { var source = e.target.getAttribute('src'); displayedImage.setAttribute('src', source); } image.onclick = sourceAlter; Furthermore, when I tried to change image.onclick = sourceAlter; to image.addEventListener('click', sourceAlter), the console says that image.addEventListener is not a function. Why is that so? EDIT: I’ve found out the problem to my code. Apparently, getElementsByTagName returns and array and therefore, I have to access the array items one by one. This also caused problems when I tried to pass image directly to addEventListener. I’ve fixed my code to the following, please grade me : var displayedImage = document.querySelector('.displayed-img'); var thumbBar = document.querySelector('.thumb-bar'); btn = document.querySelector('button'); var overlay = document.querySelector('.overlay'); for (var i = 0; i < 5; i++) { var newImage = document.createElement('img'); var path = 'images/pic' + (i + 1).toString() + '.jpg'; newImage.setAttribute('src', path); thumbBar.appendChild(newImage); } var image = document.getElementsByTagName('img'); function sourceAlter(e) { var source = e.target.getAttribute('src'); displayedImage.setAttribute('src', source); } for (var i = 0; i < image.length; i++) { image[i].addEventListener('click', sourceAlter); } /* Wiring up the Darken/Lighten button */ btn.onclick = function() { if (btn.getAttribute('class') === 'dark') { btn.setAttribute('class', 'light'); btn.textContent = 'Lighten'; overlay.style.backgroundColor = 'rgba(0, 0, 0, 0.5)'; } else { btn.setAttribute('class', 'dark'); btn.textContent = 'Darken'; overlay.style.backgroundColor = 'rgba(0, 0, 0, 0)'; } }
  • Hi Mattia, Your code doesn’t look too at at all — nice job! One bit of feedback I can give you — in the following block: function getTheImage(e, src) { var src = e.target.getAttribute('src'); displayedImage.setAttribute('src', src); } } You don’t need to define the src parameter in the function, as you are getting src inside the function body in the second line instead. So the following would work fine: function getTheImage(e) { var src = e.target.getAttribute('src'); displayedImage.setAttribute('src', src); } }
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  • "Image gallery" assessment
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