dom

常规选择器——高级选择器

由 ╄→гoц情女王★ 提交于 2020-01-31 09:31:12
高级选择器 在前面我们学习六种最常规的选择器， 一般来说通过这六种选择器基本上可以解决所有DOM节点对象选择的问题。但在很多特殊的元素上，比如父子关系的元素，兄弟关系的元 素，特殊属性的元素等等。在早期CSS的使用上，由于IE6等低版本浏览器不支持，所以这些高级选择器的使用也不具备普遍性，但随着jQuery兼容，这些选择器的使用频率也越来越高。 层次选择器 选择器 CSS模式 jQuery模式 描述 后代选择器 ul li a {} $("ul li a") 获取追溯到的多个DOM对象 子选择器 div > p {} $("div > p") 只获取子类节点的多个DOM对象 next选择器 div + p {} $("div + p") 只获取某节点后一个同级DOM对象 nextAll选择器 div ~ p {} $("div ~ p") 获取某节点后面所有同级DOM对象 在层次选择器中，除了后代选择器之外， 其他三种高级选择器是不支持IE6的， 而jQuery却是兼容IE6的。 如，html代码如下： <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>常规选择器</title> <script type="text/javascript" src="jquery-1.12.3.js"></script>

Converting Document object to Byte[]

由 不羁岁月 提交于 2020-01-31 07:10:46
问题 I am init Document object like this: DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc = docBuilder.newDocument(); After that I am building an XML file by inserting data to the doc object. Finally I am writing the contents to a file on my computer. My question is how to write the contents of doc in to a byte[] ?* This is how i write the content to the XML file: TransformerFactory

Converting Document object to Byte[]

由 谁都会走 提交于 2020-01-31 07:10:45
问题 I am init Document object like this: DocumentBuilderFactory docFactory = DocumentBuilderFactory.newInstance(); DocumentBuilder docBuilder = docFactory.newDocumentBuilder(); Document doc = docBuilder.newDocument(); After that I am building an XML file by inserting data to the doc object. Finally I am writing the contents to a file on my computer. My question is how to write the contents of doc in to a byte[] ?* This is how i write the content to the XML file: TransformerFactory

Get actual width and height of a component

由 亡梦爱人 提交于 2020-01-31 06:40:22
问题 We're facing a fairly scary issue in JavaScript that none of us seems to be quite capable of resolving: How do we get the width and height of a DOM element, including children, entire box model etc. without the component actually being displayed on the page? Remember: I'm looking for suggestions. Even answers which don't answer the question fully (or don't quite fit with the specified parameters) might, and probably will, be helpful. Main goal: I'm adding HTML elements into the page via

Get actual width and height of a component

由 与世无争的帅哥 提交于 2020-01-31 06:38:33
问题 We're facing a fairly scary issue in JavaScript that none of us seems to be quite capable of resolving: How do we get the width and height of a DOM element, including children, entire box model etc. without the component actually being displayed on the page? Remember: I'm looking for suggestions. Even answers which don't answer the question fully (or don't quite fit with the specified parameters) might, and probably will, be helpful. Main goal: I'm adding HTML elements into the page via

jQuery change page's title when user in a different tab

由 大兔子大兔子 提交于 2020-01-31 05:47:52
问题 I have live chat on my page. I want to change the title (with something moving like in omegle.com) when a new message is received and the user is not in the same tab as the live chat. When the user returns to the tab, the title would return to normal. I guess it should be done by jQuery. Do you know any plugins or how can I do that? 回答1: Title can only be edited like so: document.title = "blah"; So you could do: var origTitle = document.title; document.title = "You have ("+x+") new messages -

JavaScript的起源

由 假如想象 提交于 2020-01-31 03:45:30
今年的假期可真长啊~ 希望疫情可以早点控制住，武汉加油~ 窝在家里搞学习，之前的HTML笔记写的差不多了，有时间慢慢上传到这个上面~ 今天的博客是JavaScript的起源~ Javascript是Netscape公司与Sun公司合作开发的。JavaScript是一种脚本语言，通常只能通过web浏览器去完成一些操作而不能像普通意义上的程序那样独立运行。 什么是DOM？ 简单的说，DOM是一套对文档的内容进行抽象和概念化的方法。 什么是DHTML？ “Dynamic HTML”的简称。DHTML并不是一项新技术，而是描述HTML、css和JavaScript技术组合的术语。 DHTML背后的含义： 利用HTML把网页标记为各种元素； 利用css设置元素样式和它们的显示位置。 利用JavaScript实时地操控页面和改变样式。 w3c对DOM的定义是：“一个与系统平台和编程语言无关的接口，程序和脚本可以通过这个接口动态和修改文档的内容、结构和样式。” 来源： CSDN 作者： Alone_0922 链接： https://blog.csdn.net/weixin_44759938/article/details/104115276

Performance difference between JavaScript created inline styles and JavaScript created stylesheets

由 丶灬走出姿态 提交于 2020-01-30 14:36:15
问题 I want to dynamically style all elements of a given selector in my DOM. I see more or less two ways about it. For the example below I'll use a p element and it's text-align attribute but I'm more interested in the pros and cons of the two possible ways of doing this than I am in specifically text-aligning paragraphs. 1. Inline (per element) Styles var nodes = document.getElementsByTagName('p'); Array.prototype.forEach.call (nodes, function (node) { node.style.textAlign = "center"; }); 2.

Performance difference between JavaScript created inline styles and JavaScript created stylesheets

由 Deadly 提交于 2020-01-30 14:35:29
问题 I want to dynamically style all elements of a given selector in my DOM. I see more or less two ways about it. For the example below I'll use a p element and it's text-align attribute but I'm more interested in the pros and cons of the two possible ways of doing this than I am in specifically text-aligning paragraphs. 1. Inline (per element) Styles var nodes = document.getElementsByTagName('p'); Array.prototype.forEach.call (nodes, function (node) { node.style.textAlign = "center"; }); 2.

getElementByClassName() - is not a function [closed]

由 我的未来我决定 提交于 2020-01-30 13:28:06
问题 Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 2 years ago . I expected the code below to change Random1 and Random2 to Random but its not doing anything. When I checked developers tool in chrome, it showed "document.getElementByClassName is not a function". Any help will be appreciated. My HTML: <h3 class="Rand"><i>Random1 </i></h3> <h3 class="Rand">Random2</h3> My
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