dom

问题 I have noticed one thing. On some sites such as tray.io, asana, fb etc They have random characters in css class names when you inspect them for example: <header class="Header_XSDsdksdXKkSDD">..</Header> Why are these characters generated and how are they generated? Thanks. 回答1: Those class names or identifiers are probably generated by the engine that produces the page output. If you want to add a style to a particular element, you want a unique class for it - the easiest way is to generate

问题 I'm trying to iterate over this xml-file in Java using the DOM-Library(have to use it), and so far I've been able to get certain elements just by directly asking for it this way: NodeList pList = document.getElementsByTagName("position"); Node pNode = pList.item(0); Element pElement = (Element) pNode; double xp = Double.parseDouble(pElement.getAttribute("x")); double yp = Double.parseDouble(pElement.getAttribute("y")); double zp = Double.parseDouble(pElement.getAttribute("z")); but this doesn

问题 I'm struggling with a really weird problem... I have two pages (quite the sames) where I need to disable some selects. On one of them (say page A), I use getElementById to retrieve my element, and on the second one (say page B) I use getElement s ById (with a 's') to retrieve it (and it works on both cases). What is weird is that if I use getElement s ById on page A (with the 's'), it gives me the error "document.getElementsById is not a function", which is normal because this function (with

问题 I'm wondering if there is a way to get a handle on the DOM element that contains the script inside it. So if I had: <script type="text/javascript> var x = ?; </script> Is there a way that I can assign "x" a reference to the script element that contains "x"? 回答1: You could include some marker text in the script element, and then (similar to what David said), you can loop through all the script elements in the DOM (using getElementsByTagName or whatever features your library, if you're using

问题 I'm wondering if there is a way to get a handle on the DOM element that contains the script inside it. So if I had: <script type="text/javascript> var x = ?; </script> Is there a way that I can assign "x" a reference to the script element that contains "x"? 回答1: You could include some marker text in the script element, and then (similar to what David said), you can loop through all the script elements in the DOM (using getElementsByTagName or whatever features your library, if you're using

问题 i'm having problem when i want to select element using querySelector <ul class="xoxo blogroll"> </ul> how i can select that ul element, in my code i'm use like this var list = document.body.querySelector('ul[class="oxo blogroll"]'); alert(list.innerHTML); but the return is null ,i'm sure element ul with class xoxo blogroll is defined... thanks for your answer.. 回答1: document.body.querySelector("ul.xoxo.blogroll") And that is it... 回答2: Try this: document.body.querySelector('ul.xoxo.blogroll')

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: IE/Chrome: are DOM tree elements global variables here? I recently discovered that I can use in javascript any object from DOM with a direct reference to its id: <div id="layer">IM A LAYER</div> <script> alert(layer.innerHTML); </script> If this is true, what advantage I'd get using the getElementById method? 回答1: Accessing a DOM element directly will give you a error if the element does not exist. Wheras if you

问题 This question already has answers here : Closed 8 years ago . Possible Duplicate: IE/Chrome: are DOM tree elements global variables here? I recently discovered that I can use in javascript any object from DOM with a direct reference to its id: <div id="layer">IM A LAYER</div> <script> alert(layer.innerHTML); </script> If this is true, what advantage I'd get using the getElementById method? 回答1: Accessing a DOM element directly will give you a error if the element does not exist. Wheras if you

问题 I am new to C#. I have a relatively large XML file (28MB) and am trying to parse its subtrees into several different types based on their content. Essentially, I have 6900+ Content nodes that all have to be interrogated to figure out what type they are. <Collections> <Content>..</Content> <Content>..</Content> <Content>..</Content> ... </Collections> For each Content node, the variety of nodes below it can have 1 of 3 different patterns. I have to look into the node to decide which pattern

问题 Can someone explain why my console log is not working? Every time I select the file for verification to see if anything shows in the console nothing happens document.addEventListener("DOMContentLoaded", function() { document.getElementById('file').onchange = function() { var extPermitidas = ['txt']; var extArquivo = this.value.split('.').pop(); if (typeof extPermitidas.find(function(ext) { return extArquivo == ext; }) == 'undefined') { alert('The file cannot be used because its extension is