When a user opens a webpage, full webpage’s contents are downloaded and interpreted in a single go. This allows the browser to store the web page, however there’s no assurance that all of the downloaded content would be visible by the users. The website which loads the content at one go consumes more bandwidth & memory and it becomes a complete waste when user leaves the page from between. Nowadays we see the websites whose content are loaded gradually once we reach at that place instead of loading at single go. There are numerous ideas, options and recommendations for enhancing the load time of the website, and one of these is Lazy Loading.
A very simple concept for lazy loading is: Don’t load something until you really need it.
Lazy loading is a technique that allows a developer to define which segments of a system should not be loaded by default into storage when a program is initiated. Generally the initial program and all its dependent component are loaded at the same time. However, in lazy loading, dependents are only loaded when they are individually requested. Adding lazy loading in the website increases the loading speed, save bandwidth, and provides an uninterrupted browsing session. Lazy loading in AngularJS can be accomplished with minimal efforts & it provides significant improvement in the user experience.
There are four different approaches to execute lazy loading in your website.
Lazy Initialization: With this objects are set to null and every request for the object first checks for null and, if true, object gets loaded into it and returned.
Virtual Proxy: Herein objects are created with the same interface as the genuine object and when requested, it loads the data of the genuine object into it.
Value Holder: With this objects are created with an assigned worth and when asked for, the real data is given to it.
Ghost Object: It is the object which is loaded in the partial state. This object might be empty or it might contain some fields like ID. When the user attempts to access those fields which are not loaded at that instance the ghost object initializes itself.
Benefits of Lazy Loading
Lazy loading strikes a balance between enhancing content movement and streamlining the end client’s experience.
- Takes less time in loading the page or application hence it decrease the ratio of user leaving the website from mid. significantly enhances overall user experience.
- Unnecessary execution of SQL queries is avoided.
- Business has lower asset costs due to less consumption of bandwidth and memory since the content is just conveyed when the visitor demands it.
Developing web content is an essential part of creating a customer experience. Dynamically loading resources allow the user to explore more content without moving over to different pages or waiting for their browsers to refresh.
When implemented well, lazy loading provides very good benefit in latest technologies like AngularJS. Keeping the loading logic into separate services and using naming custom helps developers to integrate easily while working on different projects. Using lazy loading technique with AngularJS development is definitely a sure shot way to add value to performance & user experience for your web presence.