为什么我的代码不起作用？

Question

I have a button. You can appendChild a draggable div, but it doesn't work. Can anybody help me please?

JSFiddle: https://jsfiddle.net/no2o9vo4/1/

 var diva = document.getElementById("div-a"); function adddiv() { var newdiv = document.createElement("div"); newdiv.className = "babydiv"; diva.appendChild(newdiv); } function divMove(e){ this.style.top = e.clientY + 'px'; this.style.left = e.clientX + 'px'; } 

 * { padding: 0; margin: 0; } #div-a { position: relative; width: 300px; height: 300px; background-color: red; } .babydiv { transform: translate(-50%, -50%); position: relative; width: 300px; height: 200px; background-color: blue; } 

 <div id="div-a"> <div class="babydiv" onmousedown="divMove();"> </div> </div> <a onclick="adddiv()">add div</a> 

Answer 1

Wouldnt using the coordinates of the event only represent the coordinates when the event (mousedown) happened? Meaning you cant move it.

I guess you would have to have something select the target on mousedown , and then add an event listener for mousemove , changing the coordinates of the target as the mouse moves, and stop listening for the mousemove event when mouseup is fired.

I made a quick demo of my point here: https://jsfiddle.net/ymqycx0e/

Hope this helps.