How to Detect DOM and API Resources

Question

How to Detect DOM and API Resources

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#1 by (8 votes)

4

How to tell if your browser supports certain methods , properties and events

Checking whether an object querySelector , querySelectorAll , addEventListener , classList exists via Javascript.

I've been trying something with if .. else a flow control structure based on a condition.

Example

// Criando o elemento para verificar 
var elem = document.createElement('classList');

if(elem != "undefined"){

alert ('Existe sim.');

} else {

alert ('Não existe.');

}

javascript html css

asked by anonymous 02.07.2016 / 05:46

1 answer

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score 8 · Accepted Answer

Use the in a> to check if a given property exists in the object, for example:

if('querySelector' in document){
  alert("Suporta 'querySelector()'.");
}

if('classList' in document.createElement('div')){
  alert("Suporta 'classList'.");  
}