Backbone. Angular. Using HTML5 Drag And Drop To Create A Shopping Cart. The release of HTML5 introduced native Drag and Drop functionality to modern web-browsers. This means it is now possible to have movable elements on screen without the aid of frameworks like jQuery. This week we’ll be taking advantage of the drag and drop functionality to create a basic shopping cart. The basic functionality we’ll cover, will be adding an item to the cart and if it already exists updating the quantity and totals. Getting Started The first thing we’ll need is a basic structure for our cart and a list of products. To the product list, on each item I’m going to add a custom data-* attribute for the price.
Making Life Easy Since this is a pure JavaScript tutorial, we won’t have access to the event shortcuts of jQuery (or other frameworks). Function addEvent(element, event, delegate ) { if (typeof (window.event) ! The first event that we are going to use is the readystatechange event. AddEvent(document, 'readystatechange', function() { if ( document.readyState ! Querying The DOM. Drag and Drop Interaction Ideas with jQuery & CSS3. Tutorial: Handle browser events using jQuery JavaScript framework. Handling events in today web browser is a bit difficult part as different browser handles events in a different way. Hence to overcome these cross browser problems, one can leverage the Event handling APIs of jQuery. jQuery is a small JavaScript library that provides a vast number of APIs to handle different browser events and effects and a lot more.
Read more about handling User interface Effects in Browser using JavaScript. In this tutorial we will explore different API’s of jQuery to handle different browser events. Page Load event ready( fn ) This is the basic of all the event type that jQuery supports. Event Handling bind(type, data, fn) You may want to bind a handler to one or more event (click/double click etc) for any element. Trigger( event, data ) Trigger an event on every matched element. Triggered events aren’t limited to browser-based events, you can also trigger custom events registered with bind.
Interaction Helper Events Other Events helper blur( ) blur( fn ) change( fn ) jQuery AJAX Tutorial, Example: Simplify Ajax development with jQuery. jQuery, the JavaScript library provides some powerful set of jQuery AJAX API’s to handle AJAX requests. The normal way of making AJAX calls using JavaScript is a bit odd as you have to first create an XMLHttpRequest object that depends on the browser and then make an AJAX call.
Also sending a form data using AJAX is also bit difficult if we use normal JavaScript approach of calling AJAX. jQuery provides simple yet powerfull functions which have extended the JavaScript AJAX methods and provide more flexible way. Let us see different ways of doing AJAX things in jQuery. GET Request method using jQuery Load a remote page using HTTP GET request method. This is an easy way to send a simple GET request to a server. jQuery.get( url, [data], [callback], [type] ) POST Request method using jQuery Sending post method is also very easy with jQuery. jQuery.post( url, [data], [callback], [type] ) Get JSON using jQuery jQuery.getJSON( url, [data], [callback] ) AJAX Start/End using jQuery serialize()
Object-Oriented programming with JavaScript. OO Concept in JavaScript. Object-Oriented programming is one of the widely used programming paradigm that uses abstraction to create model based on real world. It is a model organized around “objects” rather than “actions” and data rather than logic. Historically, a program has been viewed as a logical procedure that takes input data, processes it, and produces output data. Object-oriented programming (OOP) uses “objects” – data structures consisting of datafields and methods – and their interactions to design applications and computer programs. Each object can be seen as a tiny machine which is responsible for the set of task assign to it. Today, many popular programming languages (such as Java, JavaScript, C#, C++, Python, PHP etc) support object-oriented programming (OOP). JavaScript has strong object-oriented programming capabilities.
Although there is differences in object-oriented capability of javascript compared to other languages. Terminology Class: Defines the characteristics of the Object. 5 Ways that CSS and JavaScript Interact That You May Not Know About. CSS and JavaScript: the lines seemingly get blurred by each browser release. They have always done a very different job but in the end they are both front-end technologies so they need do need to work closely. We have our .js files and our .css, but that doesn't mean that CSS and JS can't interact more closely than the basic JavaScript frameworks will allow. Here are five ways that JavaScript and CSS work together that you may not know about! Get Pseudo-Element Properties with JavaScript We know that we can get basic CSS style values for an element with the style property, but what about pseudo-element properties? Var color = window.getComputedStyle( document.querySelector('.element'), ':before').getPropertyValue('color'); var content = window.getComputedStyle( document.querySelector('.element'), ':before').getPropertyValue('content'); You can see how I access the content property value in my blog post about Device State Detection.
ClassList API Add and Remove Rules Directly to Stylesheets. Front-end Style Guides. We all know that feeling: some time after we launch a site, new designers and developers come in and make adjustments. They add styles that don’t fit with the content, use typefaces that make us cringe, or chuck in bloated code. But if we didn’t leave behind any documentation, we can’t really blame them for messing up our hard work. To counter this problem, graphic designers are often commissioned to produce style guides as part of a rebranding project.
A style guide provides details such as how much white space should surround a logo, which typefaces and colours a brand uses, along with when and where it is appropriate to use them. Design guidelines Some design guidelines focus on visual branding and identity. Some guidelines go further, encompassing a whole experience, from the visual branding to the messaging, and the icon sets used. The BBC’s Global Experience Language. Code standards documents We can make a similar argument for code. The front-end developer’s style guide Easier to test.