动态事件监听器仅在最后创建的元素上起作用

Question

I'm trying to add event listeners to a bunch of dynamically created divs, but for some reason it only work in the last created div. How to make the event listener work in all divs?

Update

 for (var i = 0; i < total; i++) 
{
   row_string =  row_string+  "<div id='row" + i + "' class='detail-view'></div>";
   document.getElementById('window').innerHTML = document.getElementById('window').innerHTML+row_string;
   document.getElementById('row'+i).addEventListener('click', function() {openRow("#row"+i)});
}

Thanks

Answer 1

That's because you are modifying innerHTML of the wrapper element. After modification the innerHTML is parsed and the new Nodes are generated. Since the old Nodes are replaced with the new Nodes, the event listeners that had been bound to the (now deleted) elements in the previous iterations won't work.

You should either use the event delegation technique or generate the elements using document.createElement method and append them using the .appendChild of the wrapper element (the #window element).

Here is an example of the second suggested method:

function openRow(event) {
  var id = this.id;
  // ...
}

var el, win = document.getElementById('window');

for (var i = 0; i < total; i++) 
{
   el = document.createElement('div');
   el.classList.add('detail-view');
   el.id = 'row_' + i;
   el.addEventListener('click', openRow);
   win.appendChild(el);
}

Answer 2

Correct me if I'm wrong but it looks like you're setting the ID of your div element equal to i, and not '#row' + i.

Also, this is an instance where jQuery would help immensely. Not to be that guy, but you could very easily just do

    $('.detail-view').click(function() { /* code */ });

Edit Anyways, your problem here is function scope in javascript. i will always = total in your case, even after the for loop executes. I created a closure for this.

Check out this jsfiddle. https://jsfiddle.net/jr9gzvda/