A single-page application is a web application or website that does not need to reload pages and work in a browser. When you interact with the spa, you simply scroll or click an image to update a few elements. If you want to learn to build a single-page application, you can take the web front-end training, and you can do it in a short time, so you can learn this skills more efficiently。
What techniques are used in single-page applications
Technologies allow browsers to keep single pages even when applications require server communications。
1. DI don't know what you're talking about
HTML authors can use element id to hide or display different parts of HTML documents. Then, using css, the author can use the "#target" selector to show only the part of the page that the browser navigates。
2. JavasCript frame
Web browser javasThe cript framework and library use single-page application (spa) principles such as knockout. Js, ember. Js, extjs, angularjs, meteor. Js, react, vue. Js and svelte, with the exception of extjs。
Angularjs is a complete client framework. Angularjs's template relies on two-way ui data binding. In short, data binding can be defined as the automatic process of updating the view whenever the model changes and upgrading the model whenever the view changes。
Ember. Js is a web application framework based on the model-view-controler software architecture model. It allows developers to construct scalable single-page applications by incorporating best practices and common practices into the framework, which provides a rich object model, automatically updates the template supported by handlebars. Js, announcer two-way data binding and router for managing the application status. There is much learning and use of the ember. Js framework in the web front-end training, a comprehensive system curriculum, closed learning, instructional instruction in front of professional teachers, with fewer curves in learning。
Extjs is another client framework that allows developers to build a mvc application. It has its event system, window and layout management, as well as several ui components (grids, table cells, dialogue box windows, etc.). An application developed using extjs can run independently (state in browser) or with a server (rest api is an example used to serve its internal storage)。
Meteor. Js is a whole house (customer-server) javas created for spaCript framework. It is characterized by easier binding of data than reactjs, angular or ember. It uses distributed data protocols and distribution subscriptions to automatically copy changes in client data in real time, ultimately reducing the ability of developers to prepare any synchronized code. The overall responsiveness ensures that each layer from the database to the template is automatically upgraded as required. In addition, ecosystem packages such as server rendering address the challenge of the search engine optimization (seo)。
React is a javas to build a user interfaceCript library. It is handled by instagram, facebook and the community of individual developers. React uses a new language, the combination of HTML (subset of HTML) and js. React with redux (javas)It provides state management functions (with several other libraries) and allows developers to create complex applications. To learn how to use the react library, we can enroll for the web front-end training, the theoretical course and the practical project, and these skills will soon be available。
Vue. Js is a javas for the user interfaceCript framework. Vue developers also provide vuex for state management。
3. Ajax
It allows access to json or xml data using walk-in requests to servers. Unlike the declarative approach of some spa frameworks, ajax is used and javas is used on websitesCript or javasCript library (including jquery) uses dom and performs HTML element editing. Ajax has been further promoted through libraries such as jquery, which provides a simpler syntax and regulates the behaviour of ajax between different browsers, which are historically different。
4. Websocket
Websockets is a two-way real-time customer-server communication technology and an element of HTML5. For real-time communications, they are better used than ajax in terms of simplicity and performance。
5. Events from the server
The server send events (sse) is a technology that servers can create data communications with browser clients. Once the initial connection is established, the event stream will remain open until the client closes. Sse is transmitted through traditional http and has multiple functions missing from websocket design, such as event id, automatic reconnection and the ability to send any event. Access to the web-based front-end training is the best option for learning about spa technology at the entry level, and it will help you to develop it as quickly as possible。
6. Browser plugin
Although this method is out of date, it can also be used to perform walk-through moves to servers using browser plugins such as flash, silverlight or java applet。
Data transfer (ajax, xml and json)
Requests for servers usually lead to the return of original data (e. G. Json or xml) or new HTML. If the server returns javasCript, the HTML on the client will update some parts of the dom area. When returning raw data, usually use client javasThe cript xml/(xsl) process (in the case of json, it is a template) decodes the original data as HTML, which will later be used to update parts of the dom。
7. Server structure
L streamline server system structure
The function of the web server has evolved from a spa transmission logic from the server to the client to a pure data api or web service. In some processes, this structural change has been referred to as a “simplified server system structure” to emphasize that complexity has shifted from servers to clients, ultimately reducing the complexity of the system as a whole. Learning from the web front-end training will enable you to learn a lot of spa development knowledge and skills, provide instruction in front of experienced professional lecturers, deal with problematic problems in real time, and learn quickly and effectively。
L thick server system structure
The server keeps the critical state in the memory of the client status of the page. In this way, when any request (usually user-operated) reaches the server, the server sends the appropriate javasCript and/or HTML, with substantive changes to keep the client up to date with expectations (usually part of adding/updated/deleting the client dom)。
At the same time, the server will be upgraded. Most logic is performed on the server and HTML is usually generated on the server. In some respects, servers simulate web browsers, accept events and implement incremental changes in server status that are automatically disseminated to clients。
This approach requires more server memory and server processing, but the advantage is to simplify the development of models because
1 (a) applications are usually fully encoded on servers
2,b) data from servers and ui status are transmitted in the same storage space without the need to customize client/server communication bridges。
In the web front-end training, theoretical courses + practical projects are taught together to deepen the knowledge acquired, build project experience and gain rapid advancement。
L thick non-state server system structure
This is a version of the state server method. Client page via ajax requests that data describing its current status be transmitted to the server, using which the server is able to re-establish the client status of the part of the page that has to be modified and to develop key data or codes (e. G. Json or javas)Cript), the data or codes return to the client to obtain a new state, usually changing the dom tree of the page to encourage the requested client activity。
This approach requires more data transfer to the server and may require additional computing resources to partially or completely re-establish the client page status on the server. At the same time, the technology is easy to expand as there is no data on each client page on the server. Therefore, ajax requests can be sent to different server nodes without a session data sharing or server connection。
Summary
Demand for single-page application development is increasing. An excellent user experience is provided by using a dynamic rewriting of the current page or web application instead of loading the entire new page from the server. In addition, it reduces opportunities for disruption of user travel, which is critical for web applications, particularly in digital commerce. Reducing the delay between existing pages makes the website behaves like a desktop application and provides a more fluid and comfortable experience. Students interested in the development of single-page applications can attend the web front-end training, and a few months of learning will enable them to acquire the knowledge and skills of a comprehensive system and quickly take up positions。
