javascript - Check if event.target has Children - 


 <h1>this puzzle</h1> <h3>by julian blaschke </h3> <h4 id ="result">its wrong<h4>  <table>   <tr>     <th>puzzle</th>   </tr>   <tr>  <td><div id="dropdiv1" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv2" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv3" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>   </tr>   <tr>  <td><div id="dropdiv4" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv5" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv6" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>   </tr>   <tr>  <td><div id="dropdiv7" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv8" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>  <td><div id="dropdiv9" ondrop="drop(event)" ondragover="allowdrop(event)"></div></td>   </tr>  </table>    <table style="width:100%">   <tr>     <th>puzzle</th>   </tr>   <tr>     <td><img id="1" src="splitted\1.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="2" src="splitted\2.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="3" src="splitted\3.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="4" src="splitted\4.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="5" src="splitted\5.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="6" src="splitted\6.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>     <td><img id="7" src="splitted\7.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="8" src="splitted\8.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>  <td><img id="9" src="splitted\9.png" draggable="true" ondragstart="drag(event)" width="100" height="80"></td>    </tr>  </table> 

function allowdrop(ev) {      ev.preventdefault();  }    function drag(ev) {      ev.datatransfer.setdata("text", ev.target.id);  }    function drop(ev) {   ev.preventdefault();   var data = ev.datatransfer.getdata("text");      if(ev.target.firstchild == null)       ev.target.appendchild(document.getelementbyid(data));           }    function checkifright(){  document.getelementbyid("result").innerhtml =(document.getelementbyid("dropdiv1").firstchild.src);  if (document.getelementbyid("dropdiv1").firstchild.src == "file:///c:/users/julian/desktop/schule%20201617/bsd/html_javasccript/blaschke_puzzle/splitted/1.png")  if (document.getelementbyid("dropdiv2").firstchild.src == "file:///c:/users/julian/desktop/schule%20201617/bsd/html_javasccript/blaschke_puzzle/splitted/2.png")    document.getelementbyid("result").innerhtml ="right";    }

how can check in if statment if target has child.in if appends 2 times picture should added 1 time...

i don't undestand why. should work fine appends 2 times same picture 3 time not go in if statment


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