Determine memory usage of cached DOM elements in JavaScript?

Suppose that I write some JavaScript code that displays the first ten records from a database as table row elements. When the user clicks to load more rows, the table row elements are removed from the page, but are saved in Javascript. Now, suppose that I have a similar page that displays 100 rows at a time and there are thousands of rows that the user might page thru. How can I know how muc

确定JavaScript中缓存的DOM元素的内存使用情况?

假设我编写了一些JavaScript代码,将来自数据库的前十条记录显示为表格行元素。 当用户单击加载更多行时,表格行元素将从页面中删除,但会保存在Javascript中。 现在,假设我有一个类似的页面,一次显示100行,并且有成千上万的用户可能浏览的行。 如何知道在Javascript中缓存这些元素时会使用多少内存? 使用Chrome的内存分析器:https://developers.google.com/chrome-developer-tools/docs/heap-profiling 它具有您

Safari (Mac OS X Lion) returns wrong epochtime value to position.timestamp call

I am creating a website that uses W3C Geolocation API and position.timestamp for timestamp. I have tested it on Safari 5.1.6 (Mac OS X Lion) and iPhone (5.x). iPhone default browser returns correct value for timestamp, while Safari does not. Has anyone experience similar issue? Is there a bug in Safari? Test it here: http://jsfiddle.net/vRRdE/2/ Running the test above (thanks Tyilo) I get

Safari(Mac OS X Lion)将错误的epochtime值返回给position.timestamp调用

我正在创建一个使用W3C Geolocation API和position.timestamp获取时间戳的网站。 我已经在Safari 5.1.6(Mac OS X Lion)和iPhone(5.x)上进行了测试。 iPhone默认浏览器会返回正确的时间戳值,而Safari则不会。 有没有人遇到类似的问题? Safari中是否有错误? 在此处测试:http://jsfiddle.net/vRRdE/2/ 运行上面的测试(感谢Tyilo)我在Mac OS X上使用Safari获取360419807893 (错误的使用position.timestamp )和13

HMAC MD5 Validation with Node.js, Express and Trialpay

I'm trying to authenticate a message sent from TrialPay using Node.js and Express. TrialPay signs requests with an HMAC-MD5 hash, and provides these instructions on validating. This is my code: app.post('/trialpay', function(req, res) { var key = "[MY MERCHANT KEY]"; var hash = req.header("TrialPay-HMAC-MD5"); var data = req.body.toString(); var crypted = require("crypto

使用Node.js,Express和Trialpay进行HMAC MD5验证

我试图使用Node.js和Express来验证从TrialPay发送的消息。 TrialPay使用HMAC-MD5哈希签名请求,并在验证时提供这些说明。 这是我的代码: app.post('/trialpay', function(req, res) { var key = "[MY MERCHANT KEY]"; var hash = req.header("TrialPay-HMAC-MD5"); var data = req.body.toString(); var crypted = require("crypto").createHmac("md5", key) .update(data) .digest("hex"

How to copy text to the clipboard in Javascript?

I'm wondering if there's any way to copy text to the clipboard. I'm well aware of this answer, but it's over three years old now. Has anything changed since then? The easiest thing to do at this point is to go with a Flash based solution. zeroclipboard is a common one (a nice walkthrough is available here). Browser vendors have over the past few years removed programatic ac

如何将文本复制到JavaScript中的剪贴板?

我想知道是否有任何方法将文本复制到剪贴板。 我很清楚这个答案,但现在已经有三年多了。 从那以后有什么变化吗? 在这一点上最简单的做法是使用基于Flash的解决方案。 zeroclipboard是一个常用的(这里有一个很好的演练)。 浏览器供应商在过去几年中删除了对剪贴板的编程式访问。 Safari / Chrome在改变WebKit后失去了能力,并且FireFox很长一段时间都阻止了它。 只有IE仍然是一个允许它的IE,但它最初会在每个页面上

How to get the new value of a textarea input field on paste?

I see that when I try to read the value from a textarea field when its onpaste function is called, I get the old value of the field (the one before the paste operation), not the new value (the one after the paste operation). Here is a demonstration of this behaviour: http://jsfiddle.net/qsDnr/ A copy of the code follows: <!DOCTYPE html> <html> <head> <title>On Paste&l

如何获取粘贴的textarea输入字段的新值?

我看到,当我尝试从textarea字段中读取其onpaste函数的值时,我得到该字段的旧值(粘贴操作之前的值),而不是新值(粘贴操作之后的值) 。 这是这种行为的演示:http://jsfiddle.net/qsDnr/ 代码副本如下: <!DOCTYPE html> <html> <head> <title>On Paste</title> <script type="text/javascript"> var textareaElement; var previewElement; function update() { previewElemen

Read content of external script tag with jquery

A common pattern for loading backbone templates is something like: <script type='text/template' id='foo'> my template </script> ---- var whatever = $('#foo').html(); I would like to include the script in an external file like so: <script type='text/template' id='foo' src='myTemplate.tpl'></script> But the html() of foo is now empty. I watched the browser pull th

用jQuery阅读外部脚本标签的内容

加载骨干模板的常见模式如下所示: <script type='text/template' id='foo'> my template </script> ---- var whatever = $('#foo').html(); 我想将脚本包含在外部文件中,如下所示: <script type='text/template' id='foo' src='myTemplate.tpl'></script> 但是foo的html()现在是空的。 我看着浏览器拉下了模板文件,但我不确定它是否在页面dom中。 有没有一种简单的方法可以在JavaScript

Mocha Plugin for Maven

Working on a project that's being run off of a (Java based) Apache Maven environment. The front end is utilizing Mocha tests and I'd like to be able to run the rests from Maven... any ideas? Mocha: http://visionmedia.github.com/mocha/ Maven: http://maven.apache.org/ When you say front end, do you mean in the browser? Maybe this is slightly different from what you want, but I h

用于Maven的摩卡插件

正在从(基于Java的)Apache Maven环境运行项目。 前端正在利用摩卡测试,我希望能够从Maven运行其余的... 有任何想法吗? 摩卡:http://visionmedia.github.com/mocha/ Maven:http://maven.apache.org/ 当你说前端时,你的意思是在浏览器中? 也许这与你想要的稍有不同,但我已经得到了Maven与Selenium + Jasmine合作。 带有selenium插件的Maven为报告执行浏览器实例。 然而,这些测试正在从浏览器运行,并且他

Does Google chrome support custom MIME types?

Does Google chrome support custom MIME types? Actually, I added our own MIME type in Windows Registry that Chrome should support. But, Chrome cannot read that. I have written one method in JavaScript. In that method m calling Navigator.MimeType["<customMimeType>"] . If script is executed in Firefox it gives right result but for chrome this statement doesn't work. How can

Google Chrome支持自定义MIME类型吗?

Google Chrome支持自定义MIME类型吗? 实际上,我在Windows注册表中添加了我们自己的MIME类型,Chrome应该支持这种类型。 但是,Chrome无法阅读。 我用JavaScript编写了一个方法。 在那个方法中调用Navigator.MimeType["<customMimeType>"] 。 如果脚本在Firefox中执行,它会给出正确的结果,但对于chrome,此语句不起作用。 我如何在Chrome中创建自定义MIME类型? 有什么其他的方式,插件注册他们的MIME

Chrome: JavaScript window.open to be Save

Imagine a FTP client written in HTML and JavaScript. This part works. But it would be nice if user can "copy the listing" into clipboard. Turns out that clipboard stuff is not so easy in JS (besides, listings can be huge). So better is to pop up a window with the generated listing, then user can chose to Copy'Paste, or Save the page to disk. Currently I do: my_window = w

Chrome:JavaScript window.open为保存

想象一下用HTML和JavaScript编写的FTP客户端。 这部分工作。 但是,如果用户可以将“清单”复制到剪贴板中,那将会很好。 原来,剪贴板的东西在JS中并不那么容易(除此之外,列表可能很大)。 所以更好的办法是用生成的列表弹出一个窗口,然后用户可以选择复制粘贴,或将页面保存到磁盘。 目前我做的是: my_window = window.open("", "Copy List"); my_window.document.write('<pre>n'+string+'</pre>');

Ember.js: How do I hook Ember.CollectionView after every child view is rendered?

This question demonstrates that overriding an Ember.View instance's didInsertElement allows you to execute some code after the view's element is in the DOM. http://jsfiddle.net/gvUux/2/ Naturally, overriding didInsertElement on the child view class you add to an Ember.CollectionView will run the hook after each child view is rendered and inserted. http://jsfiddle.net/BFUvK/1/ Two

Ember.js:如何在每个子视图呈现后钩住Ember.CollectionView?

这个问题演示了覆盖Ember.View实例的didInsertElement允许您在视图的元素位于DOM中之后执行一些代码。 http://jsfiddle.net/gvUux/2/ 当然,在添加到didInsertElement的子视图类上重写didInsertElement将在每个子视图被渲染和插入后运行钩子。 http://jsfiddle.net/BFUvK/1/ Ember.CollectionView, arrayDidChange和contentDidChange上的两个面向集合的钩子在底层内容发生变化之后执行,但在任何渲染发生之前执行。 ar