How to check if an element is a script [closed]

Question

I'm gathering a random element from the DOM with javascript. How can I check something likewise "if element is a script, do something" ()?

plalx · Accepted Answer

There's multiple ways to do it, depending on the level of robustness you need.

If you only deal with DOM elements of an <!DOCTYPE html> document then the following is enough:

if (el.tagName === 'SCRIPT') {
}

Note that since el.tagName is not always guaranteed to be in upper-case for all doctypes you may want:

if (el.tagName.toUpperCase() === 'SCRIPT') {
}

If you're not sure which type of object you're dealing with, you can still use duck typing:

if (el && el.tagName && el.tagName.toUpperCase() === 'SCRIPT') {
}

Or make an even stricter check in modern browsers with:

if (el instanceof HTMLScriptElement) {
}

Donate For Us