nodelist | 易学教程

Create XML document using nodeList

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问题 I need to create a XML Document object using the NodeList. Can someone pls help me to do this. This is my Java code: import javax.xml.parsers.DocumentBuilderFactory; import javax.xml.xpath.*; import org.w3c.dom.*; public class ReadFile { public static void main(String[] args) { String exp = "/configs/markets"; String path = "testConfig.xml"; try { Document xmlDocument = DocumentBuilderFactory.newInstance().newDocumentBuilder().parse(path); XPath xPath = XPathFactory.newInstance().newXPath();

Are HTMLCollection and NodeList iterables?

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问题 In ES6, an iterable is an object that allows for... of , and has a Symbol.iterator key. Arrays are iterables, as are Sets and Maps. The question is: are HTMLCollection and NodeList iterables? Are they supposed to be? MDN documentation seems to suggest a NodeList is an iterable. for...of loops will loop over NodeList objects correctly, in browsers that support for...of (like Firefox 13 and later) This appears to corroborate Firefox's behaviour. I tested the following code in both Chrome and

addEventListener on NodeList

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问题 Does NodeList support addEventListener. If not what is the best way to add EventListener to all the nodes of the NodeList. Currently I am using the code snippet as show below, is there a better way to do this. var ar_coins = document.getElementsByClassName('coins'); for(var xx=0;xx < ar_coins.length;xx++) { ar_coins.item(xx).addEventListener('dragstart',handleDragStart,false); } 回答1: There is no way to do it without looping through every element. You could, of course, write a function to do

When is NodeList live and when is it static?

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From MDN for NodeList : In some cases, the NodeList is a live collection, which means that changes in the DOM are reflected in the collection. For example, Node.childNodes is live: var parent = document.getElementById('parent'); var child_nodes = parent.childNodes; console.log(child_nodes.length); // let's assume "2" parent.appendChild(document.createElement('div')); console.log(child_nodes.length); // should output "3" In other cases, the NodeList is a static collection, meaning any subsequent change in the DOM does not affect the content of the collection. document.querySelectorAll returns a

forEach method of Node.childNodes?

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问题 After providing an incorrect answer concerning the .item() property of Node.childNodes for a question, I inspected __proto__ of the returned childNodes of a form element and found a forEach method. The forEach method of Node.childNodes is not documented in the specification of NodeList, in Methods at MDN, or Interface NodeList, and does not appear to be mentioned in Iterate a NodeList using forEach method or pages linked to that Question; though it appears available in Chromium 50. Is the

JavaScript NodeList

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问题 is there a way to join 2 NodeLists returned by 2 calls of document.getElementsByTagName? Say, I have the following code var inputs = documentElement.getElementsByTagName(\'input\'); var selects = document.getElementsByTagName(\'select\'); I want to loop through the results. Is it possible in one loop? Thank you in advance! 回答1: Seems like you can use the same Array.prototype.slice.call that makes the args array-like object become an array. (See here) var inputs = document.getElementsByTagName

When is NodeList live and when is it static?

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问题 From MDN for NodeList: In some cases, the NodeList is a live collection, which means that changes in the DOM are reflected in the collection. For example, Node.childNodes is live: var parent = document.getElementById(\'parent\'); var child_nodes = parent.childNodes; console.log(child_nodes.length); // let\'s assume \"2\" parent.appendChild(document.createElement(\'div\')); console.log(child_nodes.length); // should output \"3\" In other cases, the NodeList is a static collection, meaning any

Fastest way to convert JavaScript NodeList to Array?

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问题 Previously answered questions here said that this was the fastest way: //nl is a NodeList var arr = Array.prototype.slice.call(nl); In benchmarking on my browser I have found that it is more than 3 times slower than this: var arr = []; for(var i = 0, n; n = nl[i]; ++i) arr.push(n); They both produce the same output, but I find it hard to believe that my second version is the fastest possible way, especially since people have said otherwise here. Is this a quirk in my browser (Chromium 6)? Or