There is an approximate correspondence between this nomenclature of blocks, based on electronic configuration, and sets of elements based on chemical properties. Useful statements about the elements can be made on the basis of the block they belong to and their position in it, for example highest oxidation state, density, melting point… Electronegativity is rather systematically distributed across and between blocks. Mostly seen in old scripts.The division into blocks is justified by their distinctive nature: s is characterized, except in H and He, by highly electropositive metals p by a range of very distinctive metals and non-metals, many of them essential to life d by metals with multiple oxidation states f by metals so similar that their separation is problematic. To append HTML to the page before it has finished loading:Īfter the page is loaded such a call erases the document. "afterend" – insert html right after elem.Īlso there are similar methods, elem.insertAdjacentText and elem.insertAdjacentElement, that insert text strings and elements, but they are rarely used."beforeend" – insert html into elem, at the end,."afterbegin" – insert html into elem, at the beginning,."beforebegin" – insert html right before elem,.Given some HTML in html, elem.insertAdjacentHTML(where, html) inserts it depending on the value of where: node.replaceWith(.nodes or strings) –- replace node.node.after(.nodes or strings) –- insert right after node,.node.before(.nodes or strings) –- insert right before node,.node.prepend(.nodes or strings) – insert into node, at the beginning,.node.append(.nodes or strings) – insert into node, at the end,.elem.cloneNode(deep) – clones the element, if deep=true then with all descendants.document.createTextNode(value) – creates a text node (rarely used),.document.createElement(tag) – creates an element with the given tag,.And usually we can see this method in scripts just because they are old. But in practice these requirements rarely come together. So if we need to add a lot of text into HTML dynamically, and we’re at page loading phase, and the speed matters, it may help. It writes directly into the page text, while the DOM is not yet built. So it works blazingly fast, because there’s no DOM modification involved. Technically, when document.write is called while the browser is reading (“parsing”) incoming HTML, and it writes something, the browser consumes it just as if it were initially there, in the HTML text. So it’s kind of unusable at “after loaded” stage, unlike other DOM methods we covered above. that's after the page loaded, so it erases the existing content Here’s an example of using these methods to add items to a list and the text before/after it:Īfter one second the contents of this page will be replaced. node.replaceWith(.nodes or strings) –- replaces node with the given nodes or strings.Īrguments of these methods are an arbitrary list of DOM nodes to insert, or text strings (that become text nodes automatically).node.after(.nodes or strings) –- insert nodes or strings after node,.node.before(.nodes or strings) –- insert nodes or strings before node,.node.prepend(.nodes or strings) – insert nodes or strings at the beginning of node,.node.append(.nodes or strings) – append nodes or strings at the end of node,.Here are more insertion methods, they specify different places where to insert: For instance, we can append something to by calling div.append(anotherElement). Here we called append on document.body, but we can call append method on any other element, to put another element into it. Div.innerHTML = "Hi there! You've read an important message."
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