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JavaScript can send network requests to the server and load JSON. JS does this using something called AJAX. AJAX stands for Asynchronous JavaScript and XML. JS has an API, fetch, to GET(receive) and POST(send) information to the server.You can use fetch to GET JSON data in the following way −Exampleconst URL = 'https://jsonplaceholder.typicode.com/todos/1' // Send a GET request without any data to the server fetch(URL, {method: "GET"}) // Get the JSON data from the raw response .then(res => res.json()) // Print the result .then(console.log)OutputThis will give the output −{ "userId": 1, "id": 1, "title": "delectus ... Read More
The query string is made up of query parameters and used to send data to the server. This part of the URL is optional. It needs to be constructed by the developer. This can be done using a native method called encodeURIComponent.The encodeURIComponent() function encodes a Uniform Resource Identifier (URI) component by replacing each instance of certain characters by one, two, three, or four escape sequences representing the UTF-8 encoding of the characterUsing the new ES6 format, objects can be query string encoded in the following way −Examplelet obj = { name: 'John', age: 25, city: 'Chicago' ... Read More
lodash and underscore are both utility libraries that make JavaScript easier by providing utils that make working with arrays, numbers, objects, strings, etc. much easier. These libraries are great for −Iterating arrays, objects, & stringsManipulating & testing valuesCreating composite functionsThey are both functional libraries. Lo-Dash is a fork of Underscore, and still follows Underscore’s API enough to allow it to serve as a drop-in replacement. But under the hood, it’s been completely rewritten, and it’s also added a number of features and functions that Underscore does not provide.Lo-Dash was created to provide more consistent cross-environment iteration support for arrays, strings, ... Read More
Backbone is an MV* framework while jQuery is a DOM toolkit.With Backbone, you represent data as Models, which can be created, validated, destroyed, and saved to the server. Whenever a UI action causes an attribute of a model to change, the model triggers a "change" event; all the Views that display the model's state can be notified of the change so that they are able to respond accordingly, re-rendering themselves with the new information.While jQuery is a solid API for querying the DOM with support for event handling, deferred objects, and animations. It is best suited for things like querying ... Read More
Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backward-compatible version of JavaScript in current and older browsers or environments. Babel's plugins allow you to use the new syntax, right now without waiting for browser support.The main reasons to use babel JS are −Syntax transformation(Latest JS syntax to backward-compatible syntax.)Polyfill features that are missing in your target environment (through @babel/polyfill)Source code transformations (code modes)
Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backward-compatible version of JavaScript in current and older browsers or environments. Babel's plugins allow you to use the new syntax, right now without waiting for browser support.The main reasons to use babel JS are −Syntax transformation(Latest JS syntax to backward-compatible syntax.)Polyfill features that are missing in your target environment (through @babel/polyfill)Source code transformations (code modes)
The only hard dependency(without which backbone js won't work at all) is Underscore.js. Underscore is a JavaScript library that provides a whole mess of useful functional programming helpers without extending any built-in objects.There are other dependencies required as you proceed to use more advanced features of backbone.js. For example,Libraries for RESTful persistence(Backbone.sync)History support via Backbone.RouterDOM manipulation with Backbone.View or Jquery
The BackboneJS gives a structure to the web applications that allows separating business logic and user interface logic.The architecture of BackboneJS contains the following modules -HTTP RequestThe HTTP client sends an HTTP request to a server in the form of a request message where web browsers, search engines, etc., acts like HTTP clients. The user requests for a file such as documents, images, etc., using the HTTP request protocol.RouterIt is used for routing the client-side applications and connects them to actions and events using URLs. It is a URL representation of the application's objects. This URL is changed manually by ... Read More
Backbone is an MVC framework for the frontend. With Backbone, you represent data as Models, which can be created, validated, destroyed, and saved to the server. Whenever a UI action causes an attribute of a model to change, the model triggers a "change" event; all the Views that display the model's state can be notified of the change so that they are able to respond accordingly, re-rendering themselves with the new information.Backbone gives structure to web applications by providing models with key-value binding and custom events, collections with a rich API of enumerable functions views with declarative event handling, and ... Read More
The parseInt function available in JavaScript has the following signature −parseInt(string, radix);Where the parameters are the following −string − The value to parse. If this argument is not a string, then it is converted to one using the ToString method. Leading whitespace in this argument is ignored.radix − An integer between 2 and 36 that represents the radix (the base in mathematical numeral systems) of the string.If the radix parameter is omitted, JavaScript assumes the following −If the string begins with "0x", the radix is 16 (hexadecimal)If the string begins with "0", the radix is 8 (octal). This feature is ... Read More