08 2017 档案
摘要：For example we have the following code: Because we wrote as function component, it is using the implicit return. To debug what props have been passed
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摘要：Here we have a force layout with three nodes. In the example, we will link three nodes with line and path:
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摘要：For the whole signup process. we need to Hash the password to create a password digest Store the user's info and password digest into db Create a rand
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摘要：Learn how to leverage d3's layout module to create a Force Layout inside of React. We'll take a look at React's lifecycle methods, using them to boots
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摘要：When the data being rendered by a chart changes, sometimes it necessitates a change to the scales and axes of the chart as well. This lesson demonstra
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摘要：In D3, the General Update Pattern is the name given to what happens when a data join is followed by operations on the enter, update, and exit selectio
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摘要：After reading the blog, the main take away from there is: "Never send back JOSN array to the client side, it is easy to be hijacked, using JSON object
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摘要：New use case that is supported by the HTTP client is Progress events. To receive these events, we create our HTTP request manually in the following wa
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摘要：switchMap can chain two HTTP requests together, creating one request based on the results of the first request. But the result observable did not have
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摘要：With the shareReplay operator in place, we would no longer fall into the situation where we have accidental multiple HTTP requests. And this covers th
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摘要：From Angular V4, there is new HttpClient module, in which HttpHeaders is an immutable api.
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摘要：It is possible to use HttpParams to set http params. For example we have this url to make: So there are two params: 1. orderby 2. limitToFirst Using H
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摘要：D3 transitions start executing as soon as they’re created, and they’re destroyed once they end. This can present some challenges when attempting to cr
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摘要：D3 makes it easy to add meaningful animations to your data visualizations. Whether it’s fading in new items or tweening existing shapes to display new
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摘要：Since D3 outputs standard markup, you can use familiar dev tools and inspectors to debug your visualizations. In this lesson we’ll look at how to use
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摘要：Create a directive to check no special characters allowed:
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摘要：Similar to line charts, area charts are great for displaying temporal data. Whether you’re displaying a single set of data or multiple sets using an o
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摘要：Since Node.js V8.0+, it introduces a 'util' libaray, which has a 'promisfy' function. It can conver a callback based function to promise based functio
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摘要：We have a form component: the 'type' FormControl will be a custom form element component which refers to 'workout-type' componet. For the workout-type
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摘要：In this lesson, we extend the styles of a base button component to create multiple variations of buttons, using "extend". We can then modify the base
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摘要：In this lesson, we learn how to handle CSS keyframe animations in styled-components, via the 'keyframes' helper.
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摘要：Currently, patchValue doesn't support update FormArray. The workarround is you need to empty the form array first, then add items back.
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摘要：Which hash algorithom to choose for new application: https://www.owasp.org/index.php/Password_Storage_Cheat_Sheet Argon2[*7] is the winner of the pass
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摘要：One thing that we can do is to add styles directly to HTML elements that live within our component. However, in this lesson we see that style classes
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摘要：Angular has a very robust security model. Dynamically inserted html, style or url values into the DOM open up possibilities for attackers to compromis
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摘要：Line charts are often used to plot temporal data, like a stock price over time. In this lesson we’ll see how to use D3 APIs to create our own simplifi
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摘要：We will learn how to make use of the ngStyle directive to directly add multiple style attributes to a DOM element as a style property. We’ll also lear
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摘要：Firebase cloud functions is similar to AWS lambda or serverless. You can deploy you code which wrote in Node.js and deploy to firebase. It can respons
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摘要：In this styled-components lesson, we set a "primary color" within a UI "theme" object. We make this theme accessible to all components by wrapping our
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摘要：It it recommeded that when deals with form component, we can create a container component to hold state, and then create a stateless component to enpo
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摘要：Scatter plots, sometimes also known as bubble charts, are another common type of visualization. They’re extremely versatile thanks to their ability to
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摘要：When you occured this problem, check few things: 2. About translations, sometime angular-translate also have problems with that:
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摘要：From Anuglar v4 above, we are able to using 'as' with async pipe. This allow as using 'new variable' instead of subscribe to observable. We also able
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摘要：Column and bar charts are staples of every visualization library. They also make a great project for combining the essential pieces of D3 like selecti
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摘要：We cannot directly store user password in the database. What need to do is creating a hashed & salted string which reperstanting the user password. Th
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摘要：For example, when we open a form, we want to see all the inputs fields comes into one by one. Code for html: So we add a animation to the container ca
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摘要：Making SVGs responsive is unfortunately not as simple as adding some media queries. This lesson introduces the viewBox attribute, which is used to con
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摘要：Most charts aren’t complete without axes to provide context and labeling for the graphical elements being displayed. This lesson introduces D3’s APIs
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摘要：You can’t add axes to a chart if you don’t make room for them. To that end, the D3 community has adopted a simple convention for defining margin sizes
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摘要：Most of D3’s native selection APIs also return the selection (or a new selection), to enable multiple method calls to be chained together. Since the c
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摘要：Data visualizations are a lot more interesting when they’re interactive. Whether it’s clicks, roll overs, or drags, it makes things more compelling, a
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摘要：A simple store implemenet: Using this store in AuthService: Using Reactive approach in app.component.ts:
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摘要：Config AngularFire, we need database and auth module from firebase. For the SharedModule: We use forRoot method to register our AuthSerivce, so there
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摘要：Most of the time, your components respond to events that occur within the component tree by defining their own handler or by accepting a handler defin
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摘要：SVG is a great output format for data visualizations because of its scalability, but it comes with some idiosyncrasies and unique challenges. In this
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摘要：It’s time to live up to D3’s true name and potential by integrating some real data into your visualization. This lesson introduces the fundamental con
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摘要：Automate all the things!! Automation is crucial for increasing the quality and productivity. In this lesson we will learn how to automate the deployme
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摘要：Being able to intercept HTTP requests is crucial in a real world application. Whether it is for error handling and logging or for injecting authentica
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摘要：In this lesson, we see how we can apply styles globally with the "injectGlobal" helper method in styled-components. This method allows us to apply sty
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摘要：In this lesson, we remove the mapping between a React component and the styles applied to it via classnames. We write our styles directly within the c
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摘要：Change is good, but creating from scratch is even better. This lesson shows you how to create DOM elements from D3 and insert them into your document
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摘要：Once you can get hold of DOM elements you’re ready to start changing them. Whether it’s changing colors, labels, or even link destinations, this lesso
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摘要：Before you can create dazzling data driven documents, you need to know how D3 accesses the DOM. This lesson will show you the ins and outs of accessin
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