What could be the reason for getElementsByClassName failing to work on dynamic HTML elements?

I'm currently in the process of generating multiple dynamic HTML tables and assigning a class to each one. Here's an example:

var x = document.createElement("TABLE");
 x.className = "table_pos_parts";
 //var row = x.insertRow(0);
 //var cell = row.insertCell(0);
 //var cell1 = row.insertCell(1);
 //cell.innerText = "abc";
 //cell1.innerText = 123;

 var x = document.createElement("TABLE");
 x.className = "table_pos_parts";
 //var row = x.insertRow(0);
 //var cell = row.insertCell(0);
 //var cell1 = row.insertCell(1);
 //cell.innerText = "def";
 //cell1.innerText = 456;

After creating these tables, I tried using console.log(x) to see them in my console. However, when I attempted to search for them by their classname:

console.log(document.getElementsByClassName("table_pos_parts")); //displays empty
console.log(document.getElementsByClassName("table_pos_parts").length); //outputs 0

The result was that it showed empty. Why is this happening?

javascript

Answer №1

It appears that the element you recently created has not been properly inserted into the document.

Answer №2

Resolution:

The issue lies in not adding the x to the document.body. To rectify this, use document.body.append(x) and view it on the console.

Enhancement: Furthermore, using the same variable name twice for x means that it will only record the last element appended. To avoid this limitation, rename the second instance of the variable to something other than "x". Also, consider renaming other variables such as: cell, cell1, etc. After multiple improvements, the updated code is as follows.

Code snippet:

     var x = document.createElement("TABLE");
     x.className = "table_pos_parts";
     //var row1 = x.insertRow(0);
     //var cell1 = row1.insertCell(0);
     //var cell2 = row1.insertCell(1);
     //cell1.innerText = "abc";
     //cell2.innerText = 123;
     document.body.append(x) // add it to the document

     var y = document.createElement("TABLE");
     y.className = "table_pos_parts";
     //var row2 = y.insertRow(0);
     //var cell3 = row2.insertCell(0);
     //var cell4 = row2.insertCell(1);
     //cell3.innerText = "def";
     //cell4.innerText = 456;

     document.body.append(y) // add it to the document

You can also utilize methods like document.body.insertBefore, document.body.insertAfter etc to append it to the document.body.

For more information, refer to the documentation link

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