Question

I need to change the image on my website using 2 select for colour and size.

e.g. If I choose the option “Red” under the colour select, and then I choose the option “Small” under the size select, the image should be “small_red.png”.
Similarly, if I choose red and large, then the image should be “red_large.png”

Thus far, I only know how to do it for 1 select, but not multiple select.

Here’s my html:

<img id="imageToSwap" src="img/red.png">

<select id="colour" onChange="swapImage()">
<option value="img/red.png">Red</option>
<option value="img/green.png">Green</option>
</select>

Here’s my javascript:

<script type="text/javascript">
function swapImage(){
    var image = document.getElementById("imageToSwap");
    var change = document.getElementById("colour");
    image.src = change.value;   
};
</script>

Answer 1

var
  img = document.getElementById('imageToSwap'),
  colour = document.getElementById('colour'),
  size = document.getElementById('size'),
  change;

change = function (evt) {
  img.src = ['img/', size.value, '_', colour.value, '.png'].join('');
};

colour.addEventListener('change', change, false);
size.addEventListener('change', change, false);

with:

<img id="imageToSwap">

<select id="colour">
  <option value="red">Red</option>
  <option value="green">Green</option>
</select>

<select id="size">
  <option value="small">Small</option>
  <option value="big">Big</option>
</select>

demo: http://jsbin.com/iwezad/2/

---

though, using jQuery this could be shortend a lot, and you’d get rid of some browser quirks regarding addEventListener.

---

jQuery version:

$('#colour, #size').on('change', function() {
  $('#imageToSwap').prop('src', 
    ['img/', $('#size').val(), '_', $('#colour').val(), '.jpg'].join('')    
  );
});