从数组元素设置img标签的src属性

Question

I have an array

pics = ["url1", "url2", "url3"]

I want want to be able to set the src attribute of an image to an array element like so:

<img src = pics[0]>

Problem is that html does not recognize that I am want the string element pic[0] not literally "pic[0]", so it throws an error

Uncaught TypeError: Cannot set property 'src' of null 

Thanks

Answer 1

You can't use JavaScript in arbitrary HTML attributes. You need to modify the DOM to add them afterwards.

 var img = document.createElement('img');
 img.alt = "Suitable alternative text";
 img.src = pics[0];
 document.getElementById('someElement').appendChild(img);

Make sure the script runs after someElement exists so it doesn't error on the last line.