Determine the width of a dynamically generated div element in JavaScript using the createElement method

Currently, I am utilizing the JavaScript function createElement to generate a new div element and then assigning its innerHTML. Following that action, I am attempting to determine the necessary width required to display the div with all of its content.

var newDiv = document.createElement("div");

newDiv.innerHTML = "My new<br/>DIV";

// Now looking to retrieve the width of the div

I have made several attempts:

Call                                      Result
--------------------------------------    -------------
newDiv.width                              undefined
newDiv.scrollWidth                        0
newDiv.clientWidth                        0
newDiv.offsetWidth                        0
newDiv.innerWidth                         undefined
newDiv.outerWidth                         undefined
newDiv.getBoundingClientRect().width      0

The section of JavaScript code responsible for creating the div is triggered by an AJAX callback; it remains unclear whether this may be contributing to the issue at hand.

javascriptajax

Answer №1

The issue at hand is that the element has just been created without being attached to anything.

Here's a solution -

var newDiv = document.createElement("div");

Next, append the new element to another existing element in the HTML, for example, the body.

document.body.appendChild(newDiv);

Finally, you can use the following command to measure:

newDiv.clientWidth

If you try this in the console, it should look something like this:

var newDiv = document.createElement("div");
=> undefined

document.body.appendChild(newDiv);
=> <div>​</div>​

newDiv.clientWidth
=> 1281

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