here is the file I have. when I try to sort some number it doesn't change and keeps empty

HTML file

<tr>
<th>Original array</th>
<td id ="td1">1,5,7,-1,3</td></tr>
<tr>
<th>Sorted Array</th>
<td id="td2"></td>

JS file

var OriginalArr = document.getElementById("td1").value;
var a =  document.getElementById("td2").value;
a.value = Original.sort();

CodePudding user response：

There are two main problems with this. First of all, most elements do not have a value property, only the elements that take input. You seem to be looking for textContent in this context.

Another thing is that when you get the text in td1 it must be converted to an array before you can sort it.

Here is the code with the mentioned problems fixed:

// Get text in td1
var td1Text = document.getElementById("td1").textContent;

// Get array of numbers from text
var OriginalArray = td1Text.split(",").map(function(num){
  return parseInt(num,10);
});

// Get td2
var td2 =  document.getElementById("td2");

// Set td2 to sorted array converted to string
td2.textContent = OriginalArray.sort().toString();

<table>
<tr>
<th>Original array</th>
<td id ="td1">1,5,7,-1,3</td></tr>
<tr>
<th>Sorted Array</th>
<td id="td2"></td></tr>
</table>

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

One more thing to note is that the <tr> tags must be in a <table> in order to be properly queried by getElementById. Without the table tag, getElementById returns null.

CodePudding user response：

You have
a.value = Original.Sort();

And it should be
a.value = Orriginal.Sort();