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Python.Engineering Wiki Javascript Each Function

Javascript Each Function

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Michael Zippo Michael Zippo 04.11.2021

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jQuery each () is a concise way to iterate through DOM elements. The Each () Method is designed to be called on the target jQuery object. A jQuery object is an object that contains one or more DOM elements and has access to jQuery methods. Not only will each () have fewer errors, it is easier to manipulate multiple DOM elements.

jQuery each () requires a callback function - a function passed to another function that will be executed later. In the callback function is access to the index number of the element and to the element itself. You will find a more complete analysis of the callback functions.

Applying each () is as simple as any JavaScript loop, but there is little room for potential confusion. We will clarify these points and examine the syntax. At the end of this guide, there will be step-by-step code examples to see the different ways to apply jQuery each ().

What is jQuery each ()?

jQuery each is a loop process for the jQuery library. It works like a JavaScript loop by iterating over DOM elements. jQuery each () requires a callback function, and inside the callback function is where the DOM elements can be manipulated.

While inside the body of the callback function, conditional statements can be used to modify some of the selected items. The conditional statements are so ... then in JavaScript. This provides a deeper level of control over exactly how items are changed.

Syntax jQuery each ()

jQuery each can be invoked in two ways. First, as a method called on a selected item. The callback function accepts up to two optional arguments: index and value. Index is the index number of the current item . If the current element were first in the list, the index number would return 0.

the value argument refers to the current element. It is important to note that in order to concatenate a method to the value we need to wrap the value in a jQuery selector. we put all of this in abstract code so that we can break down the syntax detail .

here we choose each

Remember that [object Object] is a string representation of an object. This means that we need to call a method to extract the exact value we want. In the above case , we are using the text () method to reveal the text attribute of the object. Read more on [object object] to get an idea of ‚Äã‚Äãwhat exactly came back .

The above example stores the index number followed by the text attribute for each

writing this way saves the text of the current

guide covers the details of direction functions.

Examples jQuery each ()

Let ’s expand the syntax examples above and add some attributes. Let’s start with a basic HTML rendering of a list of colors belonging to different classes.

This makes all text elements in the DOM First, we’ll start by just saving the text to the console using the direction functions and a traditional function.

Selecting only elements is returned .

We have the same results, but using the this keyword.

we can use an anonymous function - an unnamed function, like callback. Again , it returns red, purple, and blue text. It should be noted that even though the directing functions have some jQuery functionality, it is recommended to use the traditional functional notation for jQuery callbacks.

We now know how to iterate through a collection of articles. Now let’s have some fun color and change!

< style> .colorSelect {color: blue; } {.Green color: green; }

Following the color list page , we added some classes to the