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[purposecode]

How to loop through an array in Javascript?

1)- What is an array?

An array is a variable in JavaScript used to store data. Arrays are used when we have a large list of data and we want to store it to access it one by one.

For more information about arrays, how to create them in JavaScript and how to add, remove elements and join multiple arrays please check the following tutorial: https://purpose-code.com/javascript-arrays-how-and-what/

2)- How to loop through an array?

1)- For loop

To loop through an array the 1st common method is to use the for loop method.

The for loop method will run through the elements of the array, but it does not look for the element itself, but for its index/position in the array.

Let’s take an example to see how for loop works exactly.

To continue reading you can check the complete article below:

https://purpose-code.com/how-to-loop-through-an-array-in-javascript/

[rehman-coding]

. Thanks for your support😃❤ . #web #htmlcss #html5 #css3code #js #webdeisgn #javascript #javascriptdeveloper #webdesigner #websitedesign #website #programming #code #coding #100daysofcode #reactjs #bootstrap #webdeveloper #webdevelopment #wordpress #python #java #frontend #backenddeveloper #fullstackdeveloper #developerslife https://www.instagram.com/p/CNfjOtigKHC/?igshid=3j10cvzzel3o

[rehman-coding]

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[ui-development]

JAVA FULL STACK MARATHALLI CERTFICATION TRAINING

[joysupermans-blog]

Simple Tricks! To Find Overflow In The Web Page [Just 1 Second]

Sometimes we get overflow in the x-axis direction of a web element or Section ( SELECTOR ). But we can not find which this element or page section getting overflowing. We call the overflow “Hidden Horizontal Overflow”.

[codehemu]

10 Velocity JS Animation Library [Velocity.JS]

Collection of free HTML and CSS Velocity JavaScript Library Animation examples from Codepen and other resources.

[purposecode]

What’s the difference between absolute and relative positioning in CSS?

absolute and relative position properties are used a lot in CSS and seem to be doing the same work, which is positioning an element in the page. But in reality, they’re different.

In this tutorial we’ll see how each one of these properties work.

1)-First difference

a)- absolute position

Let’s just take a simple html page that contains 4 <div></div> tags one inside another. These <div></div> tags have a width, height and a background-color.

The HTML code will be:

And the CSS code is:

the display flex property is just to center the boxes vertically one inside another. So at the end we’ll have:

Now let’s apply the position absolute to the small blue box, which means box 4.

So the CSS code becomes:

If you refresh the browser you will not see anything changed. Why? Because the absolute position needs top, bottom, left and right values.

let’s position this blue box at the top left corner of the green box. For that we’ll set the top and left to 0px and see what will happen.

The CSS code will be:

So in the browser we’ll have:

Wow, what’s this! This is not what we want at all ! Why did the blue box move to the top left corner of the page instead of the top left corner of the green box ?

Well, it is because when applying the absolute position to an element, It positions itself to the closest parent that has already its position set.

Here in this example, none of the 3 remaining boxes (light blue, red, green) have their position set. The default position that they have is unset.

So the small blue box did not find any parent element to position itself to, so what it did it positioned itself to the body.

Now, if there was a parent element with a specific position already set, let’s say the position of the green box (which means box3) is set to absolute:

We would have had the results wanted:

Let’s say now that we want to position the blue box to the red box, so we will add the absolute position to the red box (box 2) and remove it from the green box. Because if we keep the absolute position in the green box as well, the small blue box will position itself to the the closest parent it finds that has the absolute position.

So the code will be:

In the browser we’ll have:

b)- relative position

Now let’s change the position type of the blue box and set it this time to relative instead of absolute. Also let’s give it a top value of 10px and a left value of 20px.

So in the browser we’ll have:

As you have probably noticed, the blue box this time positioned itself to its origin, and not to a certain parent element as with absolute position. And this is the difference between absolute and relative positioning.

You can add absolute or relative position to any parent box you want, this will not affect the positioning of the small blue box.

Because relative position cares only about the origin of the element, and not about a certain parent element position like absolute position does.

2)- Second difference

a)- absolute position

Now let’s take 3 boxes, or 3 <div></div> tags that will be aligned one next to another. Each box has a background-color:

To continue reading check my tutorial:

https://purpose-code.com/absolute-and-relative-positions-whats-the-difference/

[purposecode]

CSS margin and padding: What are they and how do we use them?

If you’re new to CSS or have used it for a little while you might have heard the words margin and padding but aren’t quite sure what they mean, or how to use them in your website.

Both properties are used to provide extra space or a gap. But what is the difference between them if they both provide space?

This tutorial will explain how these elements are used and how do they help in your website design.

1)- Margin property

margin is a CSS property that adds space between the elements.

If you have many elements on your website, and would like to add some space between them and position them differently, you use margin property to do that.

Let’s see some examples:

a)- margin-top

Let’s say that we have 2 <div></div> elements with the same width and the same height, one has a background-color of blue and the other a background-color of red.

So in the browser they look like this:

As you can see, they are on the top of each other. There is no space between them.

If we want to add some space between them one of the properties we can use is margin-top.

margin-top is a CSS property that adds some space between the top edge of the element and the bottom edge of the element before it.

in this example, if we add a margin-top to the red <div></div> then it will add space between the top edge of the red <div></div> and the bottom edge of the blue <div></div>.

In other words, it is the red <div></div> that will shift a little bit down because a space will be added to the top.

Let’s add a margin-top of 20 px.

At the end we’ll have:

So now as you can see, a 20px space is added between both elements.

margin-top is a space that is always added between the element and the one before this element.

b)- margin-bottom

margin-bottom property adds some space between the bottom edge of an element and the element after it.

If we add a margin-bottom value to the blue <div></div>, then a space will be added at the bottom of the <div></div> pushing the red <div></div> to go a little bit down.

Let’s add a margin-bottom value of 60px to the blue <div></div>.

So we’ll have at the end:

Both margin-top and margin-bottom add some space between elements, but one adds space between the top edge of an element and the bottom edge of the element before it (margin-top) and the other adds space between the bottom edge of the element and the element after it(margin-bottom).

margin-top and margin-bottom add space vertically between elements.

c)- margin-left

Now let’s take 2 simple pictures, one picture of a cat and one picture of a dog.

let’s display them on the browser and resize them by giving them a width of 20%.

In the browser they look like this:

As you have probably noticed, these pictures are aligned one next to another. There is no space between them.

To add some space we can add the margin-left CSS property.

margin-left adds space on the left of an element. For example here if we add a margin-left to the dog image we will have some space on the left of the dog image, and the dog image will be shifted to the right.

Let’s add a margin-left value of 150px.

So in the browser we’ll have:

And here you are, now there is a space of 150px between both images.

d)- margin-right

To add some space and push the dog picture to the right, we could have also used margin-right property instead of margin-left.

But this time, we would have applied margin-right property to the cat picture, because we want the dog picture to be pushed to the right. So we need space to be added between the 2 pictures for the dog picture to be pushed to the right. And margin-right adds space on the right of an element.

If we apply margin-right to the dog picture, then we will not notice anything, as the space will be added to the right of the picture and next to the dog picture there isn’t any other element to be pushed.

Let’s add a margin-right value of 200px.

So in the browser we’ll have:

Both margin-left and margin-right add space between elements. margin-left adds space on the left of an element and margin-right on the right.

margin-left and margin-right both add space horizontally between elements.

e)- margin shorthand

For an element, if we want to add some space on the left and the right, or at the top and the bottom, or maybe on the left and the right and the top and the bottom at the same time, instead of using margin-left, margin-right, margin-top and margin-bottom individually, we can combine them in one CSS property that is margin.

For example, let’s say that we want to add some space on the left and the top of the dog picture:

First, let’s display them in block to make one picture below another:

So the pictures will be aligned vertically like this:

Now let’s add some space on the left and the top of the dog picture:

We can write the code like this:

But this can be a little bit long and as we are lazy we will use margin property instead. So the code will be:

What does it mean? Simply the first value of the margin 150px represents space added at the top of an element, in other words it represents the margin-top property. The next value 0px represents the space that will be added on the right, in other words margin-right property. The next value 0px represents the space that will be added at the bottom, and by now you know that it represents margin-bottom property. And finally the last value 300px is the space that will be added on the left of an element, or should I say margin-left property.

So in the browser we’ll have:

To read more check the following tutorial: 

https://purpose-code.com/css-margin-and-padding-what-are-they-and-how-do-we-use-them/