Also be careful how you execute the js on the page. For example if you do something like this: (function(window, document, undefined){ var foo = document.getElementById(“foo”); console.log(foo); })(window, document, undefined); This will return null because you’d be calling the document before it was loaded. Better option.. (function(window, document, undefined){ // code that should be taken … Read more
document.all is a proprietary Microsoft extension to the W3C standard. getElementById() is standard – use that. However, consider if using a js library like jQuery would come in handy. For example, $(“#id”) is the jQuery equivalent for getElementById(). Plus, you can use more than just CSS3 selectors.
document.getElementById(‘myframe1’).contentWindow.document.getElementById(‘x’) Fiddle contentWindow is supported by all browsers including the older versions of IE. Note that if the iframe‘s src is from another domain, you won’t be able to access its content due to the Same Origin Policy.
Anyway, this method seems to be quite poorly documented, and In fact, the sources I come across don’t even give it a mention […] Reliance on implicitly-declared global variables aside, the lack of documentation is a great reason not to use it. The apparent promotion of id values into global variables isn’t standards compliant (the … Read more
The getElementsByClassName method is now natively supported by the most recent versions of Firefox, Safari, Chrome, IE and Opera, you could make a function to check if a native implementation is available, otherwise use the Dustin Diaz method: function getElementsByClassName(node,classname) { if (node.getElementsByClassName) { // use native implementation if available return node.getElementsByClassName(classname); } else { … Read more
You can do that by specifying the ref EDIT: In react v16.8.0 with function component, you can define a ref with useRef. Note that when you specify a ref on a function component, you need to use React.forwardRef on it to forward the ref to the DOM element of use useImperativeHandle to to expose certain … Read more
What is supposed to happen is that ‘named elements’ are added as apparent properties of the document object. This is a really bad idea, as it allows element names to clash with real properties of document. IE made the situation worse by also adding named elements as properties of the window object. This is doubly … Read more