Posts

Understanding ReactJS lifecycle methods

The React lifecycle method helps us in adding logic during different phases of component rendering.
Let us look at the various lifecyle methods of ReactJS and understand when they will be triggered during the component render.

Do remember that the below listed lifecycle methods is only applicable to class based components and not for functional components.


constructor()
This is the first method that is triggered during the component's lifecycle, this method is usually used to initialize state or to make API calls before showing it to the user also note that
this method is called only once during the entire lifecycle of the component.

render()
 This is the most important method of class component. If we fail to write this method react will thrown an error it is a must have method in any class component this method primary purpose is to return the UI or the JSX we plan to render on the browser. This method is triggered after the constructor call and every time there is a change in the c…

What are Directives in Angular JS

Directives allows us to create custom HTML elements and to manipulate DOM(Document Object Model).
There are three type of directives

1. Component directive
    Creates custom HTML elements or templates

2. Structural directives
    Allows us to add or remove elements on the DOM. ex: nGFor,ngIF

3. Attribute directives
    allows us to attached event listeners or style properties on elements

to create a directive we will have to import it from @angular/core and define a selector once done we will have to add a reference to it on app.module.ts


How to remove plus and minus characters from input type number

Here is a solution on how to remove the plus and minus characters from the input type number and retain the existing value of the input field excluding the plus and minus symbols, i have used jquery for this hack this can also be achieved with plain javascript.

Here is the code snippet which removes the plus and minus signs from number field


See the Pen BxqXep by Purushothaman (@purush97k) on CodePen.

HTML5 | LocalStorage

HTML5 LocalStorage a feature that's been added to HTML5 specification, which enables storing data on clients machine, which can be retrieved and manipulated for future use unless the user clears the cache from browsers.

Though we can store data there is a limitation as in how much we can store, the current max size of storing is 5Mb, which is quite a big amount, lets look how to store  and retrieve data on client's machine

Storing data:
To store data we use the native localStorage.setItem(key,value) method which expects two arguments as shown the key and the value like so:
localStorage.setItem('user_name','purush');

Retrieving Data:
To Retrieve data we use the native localStorage.getItem(key) method which expects one argument as shown which is the key, lets retrieve the previously stored data
localStorage.getItem('user_name');
this will return 'purush'

Clearing Data:
To remove or clear stored data we can use either localStorage.removeItem(key) to…

Remove Scrollbars from syntaxhighlighter

Image
It's easy to remove the scrollbars that's generated by the syntax highlighter plugin  go to the CSS file you using provided in the plugin for example" shCoreDefault.css" or the cutom css theme file you're using.
and find class

.syntaxhighlighter and comment or remove
overflow: auto !important;

that's it the scrollbar's that's created by the plugin is gone and you'll get the default scroll bars of the browser window

CSS Sprites | What are They?

Image
CSS Sprites most web developers should have heard this term, so what is it ?.
CSS Sprite bunch of other images transformed into one Big Image. The origin of the term "sprites" comes from old school computer graphics and the video game industry.

Adding Sprites to our websites helps with webpage performance, since the webpage has to make only one request to the server, which will fetch the Sprite (the Big image) which includes all the other images that you want to use in your webpage. since the server makes only one request your page will load a lot faster compared to conventional way of linking each images separately.

Here is a demo on how to use CSS Sprites. further more there a many Sprite generators online to create CSS Sprites all you have to do is upload a bunch of images to these Online tools and they will generate the Sprite for you.







As you see above the are two images called "Signup image" and "Signup confirmation image"  are made into one Big Image …

HTML5 Semantic Tags | What do they mean

HTML markup has changed a lot especially when the WHATWG introduced semantic tags.  
Semantic Tags? What do they mean. The Semantic Markup helps Humans and Machines to Interpret the HTML markup in a more meaningful way. Which helps the HTML markup to be structured in a more meaningful way. remember adding semantic tags to your HTML5 markup wont change the apperance of your page, but it Gives more meaning to your Markup.  
Here is a list of few HTML5 semantic tags.

<section>  </section><article>  </article><header>    </header><nav>          </nav><aside>      </aside><footer>    </footer>As you see above the above tags wont make our web pages pretty but it gives more meaning to the markup.

How CSS3 Works

CSS works with HTML, but it’s not HTML. It’s a different language altogether. While HTML provides structure to a document by organizing information into headers, paragraphs, bulleted lists, and so on, CSS works hand-in-hand with the web browser to make HTML look good. For example, you might use HTML to turn a phrase into a top-level heading, indicating that it introduces the content on the rest of the page. However, you’d use CSS to format that heading with, say, big and bold red type and position it 50 pixels from the left edge of the window. In CSS, that text formatting comprises a style—a rule describing the appearance of a particular portion of a web page. A style sheet is a set of these styles. You can also create styles specifically for working with images. For instance, a style can align an image along the right edge of a web page, surround the image with a colorful border, and place a 50-pixel margin between the image and the surrounding text. Once you’ve created a style, you…

jQuery Resources | Support and tutorial help

jQuery has a number of Official and Nonofficial websites and Online resources dedicated to it. Where you’ll find information like tutorials, plugins download’s and more. It here will be sharing a few of these website which valuable for jQuery lovers.
·Jquery.com ·Jqueryui.com ·Jquery4u.com ·Smashingmagazine.com ·Jqueryplugins ·Visualjquery.com ·Jqueryvideo casts ·marcgrabanski.com ·digital-web.com
forgive me if I have missed out any other useful resources . do comment about any other resources so that I’ll add them to existing resources.

Login form | Using CSS3

Image
Here is an awesome demo of a login form, which makes good use of CSS3 and HTML5. In this demo, i have made extensive use of gradients, text-shadows and box-shadows to achieve a beautiful and modern looking login form. The design of this login form was originally taken for codrops.com, hope you'll like and use this login form in your projects.
ViewDemo |  Download Source