dc.js: stacked area chart using reduceCount method

I'm fairly new to the dc.js/crossfilter/d3 trifecta, and have a question about grouping variables for building a stacked area chart. I've been following tutorials like this one that show how to generate a time series chart. This has been really useful, however my method of defining the .group() method of the chart is slightly different. In the example, the author has data of the form {

dc.js:使用reduceCount方法堆积面积图

我对dc.js / crossfilter / d3 trifecta相当陌生,并且对构建堆栈面积图的变量进行分组存在疑问。 我一直在学习像这样的教程,展示如何生成时间序列图表。 这非常有用,但是我定义图表的.group()方法的方法略有不同。 在这个例子中,作者具有{'date': somedate, 'http_404': 20, 'total': 340 ... } ,其中每种类型的http请求都具有某种与http关键字相关的显式值。 然后直接使用.reduceSum()方法按

How do I pass command line arguments to a nodejs program?

I have a web server written in Node.js and I would like to launch with a specific folder. I'm not sure how to access arguments in JavaScript. I'm running node like this: $ node server.js folder here server.js is my server code. Node.js help says this is possible: $ node -h Usage: node [options] script.js [arguments] How would I access those arguments in JavaScript? Somehow I was n

如何将命令行参数传递给nodejs程序?

我有一个用Node.js编写的Web服务器,我想用特定的文件夹启动。 我不确定如何访问JavaScript中的参数。 我像这样运行节点: $ node server.js folder 这里server.js是我的服务器代码。 Node.js的帮助说这是可能的: $ node -h Usage: node [options] script.js [arguments] 我将如何访问JavaScript中的这些参数? 不知何故,我无法在网上找到这些信息。 标准方法(无库) 参数存储在process.argv 以下是处理命令行

Retrieve public Facebook page via Facebook Graph API

Is there a possibility to get the feed of a public Facebook page? For example from https://www.facebook.com/AudiDE. So far as I know, I can only access my own profile pages through the graph API by sending something like this: https://graph.facebook.com/{userid}/feed?limit=1&locale=de_DE&access_token={access-token}&fields=id,from,status_type So is there a way to get access to a p

通过Facebook Graph API检索公共Facebook页面

是否有可能获得公共Facebook页面的提要? 例如从https://www.facebook.com/AudiDE。 据我所知,我只能通过发送像这样的图形API访问我自己的配置文件页面: https://graph.facebook.com/{userid}/feed?limit=1&locale=de_DE&access_token={access-token}&fields=id,from,status_type 那么有没有办法通过PHP或JavaScript访问公共Facebook页面? 是的,您可以使用App Access Token或User Access Token来获取Feed

Copying array by value in JavaScript

When copying an array in JavaScript to another array: var arr1 = ['a','b','c']; var arr2 = arr1; arr2.push('d'); //Now, arr1 = ['a','b','c','d'] I realized that arr2 refers to the same array as arr1 , rather than a new, independent array. How can I copy the array to get two independent arrays? Use this: var newArray = oldArray.slice(); Basically, the slice() operation clones the array and

在JavaScript中按值复制数组

将JavaScript中的数组复制到另一个数组时: var arr1 = ['a','b','c']; var arr2 = arr1; arr2.push('d'); //Now, arr1 = ['a','b','c','d'] 我意识到arr2是指与arr1相同的数组,而不是一个新的独立数组。 我如何复制数组来获得两个独立的数组? 用这个: var newArray = oldArray.slice(); 基本上,slice()操作克隆数组并将引用返回给新数组。 另请注意: 对于引用,字符串和数字(​​而不是实际对象),切片将对象

CSS: Hiding cursor without any external files

I know there's a lot of answered questions concerning cursor hiding in CSS already, but what I'm trying to do is define the css inline using the data uri base64 scheme without any external files. And indeed, I've managed to come up with a quite functional solution, the problem is that whatever I do, IE doesn't seem to recognize the data URI even though it carries the .cur file.

CSS:隐藏光标而没有任何外部文件

我知道有很多关于游标隐藏在CSS中的问题,但我正在尝试的是使用数据uri base64方案在没有任何外部文件的情况下内联定义css。 事实上,我设法提出了一个相当实用的解决方案,问题是无论我做什么,即使它携带.cur文件,IE似乎也无法识别数据URI。 这打开了两种可能性。 要么我需要一个非常特定的MIME类型,或者对数据URI的IE支持是半分的。 任何人都知道解决方案? 类定义如下所示: .noCursor { cursor: url('data:image/p

Convert JS object to JSON string

If I defined an object in JS with: var j={"name":"binchen"}; How can I convert the object to JSON? The output string should be: '{"name":"binchen"}' 目前所有的浏览器都内置了原生的JSON支持。因此,只要你不处理像IE6 / 7这样的史前浏览器,你就可以像这样简单地做到这一点: var j={"name":"binchen"}; JSON.stringify(j); // '{"name":"binchen"}' 使用JSON.stringify()或大多数现代浏览器中的本机。 JSON.st

将JS对象转换为JSON字符串

如果我用JS定义了一个对象: var j={"name":"binchen"}; 我如何将对象转换为JSON? 输出字符串应该是: '{"name":"binchen"}' 目前所有的浏览器都内置了原生的JSON支持。因此,只要你不处理像IE6 / 7这样的史前浏览器,你就可以像这样简单地做到这一点: var j={"name":"binchen"}; JSON.stringify(j); // '{"name":"binchen"}' 使用JSON.stringify()或大多数现代浏览器中的本机。 JSON.stringify(value, replacer, space)

How do I test for an empty JavaScript object?

After an AJAX request, sometimes my application may return an empty object, like: var a = {}; How can I check whether that's the case? ECMA 5+: // because Object.keys(new Date()).length === 0; // we have to do some additional check Object.keys(obj).length === 0 && obj.constructor === Object Pre-ECMA 5: function isEmpty(obj) { for(var prop in obj) { if(obj.hasOwnProp

如何测试空的JavaScript对象?

在AJAX请求之后,有时我的应用程序可能会返回一个空对象,如: var a = {}; 我如何检查是否是这种情况? ECMA 5+: // because Object.keys(new Date()).length === 0; // we have to do some additional check Object.keys(obj).length === 0 && obj.constructor === Object ECMA前5: function isEmpty(obj) { for(var prop in obj) { if(obj.hasOwnProperty(prop)) return false;

Check if a value is an object in JavaScript

你如何检查一个值是否是JavaScript中的对象? Try using typeof(var) and/or var instanceof something . EDIT: This answer gives an idea of how to examine variable's properties, but it is not a bulletproof recipe (after all there's no recipe at all!) for checking whether it's an object, far from it. Since people tend to look for something to copy from here without doing any research, I&#

检查一个值是否是JavaScript中的一个对象

你如何检查一个值是否是JavaScript中的对象? 尝试使用typeof(var)和/或var instanceof something 。 编辑:这个答案给出了如何检查变量的属性,但它不是一个防弹食谱(毕竟没有食谱!)来检查它是否是一个对象,远离它。 由于人们倾向于在没有做任何研究的情况下寻找要从这里复制的东西,我强烈建议他们转向另一个,最有利的(并且是正确的)答案。 如果typeof yourVariable === 'object' ,它是一个对象或null。

native JSON support (window.JSON)

I have seen references to some browsers natively supporting JSON parsing/serialization of objects safely and efficiently via the window.JSON Object, but details are hard to come by. Can anyone point in the right direction? What are the methods this Object exposes? What browsers is it supported under? All modern browsers support native JSON encoding/decoding (Internet Explorer 8+, Firefox 3.1

本地JSON支持(window.JSON)

我已经看到一些浏览器通过window.JSON对象安全高效地支持JSON解析/序列化对象的一些浏览器,但细节很难得到。 任何人都可以指出正确的方向吗? 这个Object暴露的方法是什么? 它支持哪些浏览器? 所有现代浏览器都支持本地JSON编码/解码(Internet Explorer 8+,Firefox 3.1 +,Safari 4+和Chrome 3+)。 基本上, JSON.parse(str)将解析的JSON字符串str并返回一个对象,和JSON.stringify(obj)将返回对象的JSON表示obj 。

Angular upload image and display to user

Id like to implement a UI where the user selects an image and that image is instantly displayed back to them for review. The user would have to click "submit" to upload/save the image to their profile. I am having issues with the "instantly display back to the user part". I am using angular FormData with the following markup & controller: MARKUP <input id="choos

角度上传图片并显示给用户

我喜欢在用户选择图像时实现一个用户界面,并且该图像会立即显示给他们以供审阅。 用户必须点击“提交”才能将图像上传/保存到他们的个人资料中。 我遇到了“即时显示回用户部分”的问题。 我正在使用带有以下标记和控制器的角度FormData: MARKUP <input id="chooseFile" type="file" file-model="picFile" /> <img src="{{uploadedImage}}" /> <!-- this populates with filename but what is the path?? -