9+ Jquery Each 使い方 Ideas

【高校英語】 each / every の使い方② （5分） YouTube from www.youtube.com

Introduction

JQuery is a popular JavaScript library that simplifies HTML document traversing, event handling, and animation. One of its most useful functions is the "each" method. In this tutorial, we'll teach you how to use JQuery each and help you understand its application in a real-world scenario.

What is JQuery Each?

JQuery Each is a method that allows you to iterate over a collection of elements and perform a function on each element. It is usually used when you want to perform the same operation on multiple elements. The method is flexible and can be used with a variety of data types, including arrays and objects.

Using JQuery Each

To use JQuery Each, you first need to select the elements you want to iterate over. You can do this using a JQuery selector. Once you have your selection, you can call the each method and pass in a function that will be executed for each element. For example, let's say you have a list of items that you want to loop through and apply some styling. Here's how you can do it using JQuery Each: ```javascript $( "li" ).each(function() { $( this ).addClass( "highlight" ); }); ``` In this example, we're selecting all the "li" elements on the page and adding a "highlight" class to each one.

Passing Arguments to the Function

You can also pass arguments to the function that is executed for each element. The first argument is the index of the element, while the second argument is the element itself. For example, let's say you have a list of items that you want to loop through and log to the console. Here's how you can do it using JQuery Each: ```javascript $( "li" ).each(function( index, element ) { console.log( index + ": " + $( element ).text() ); }); ``` In this example, we're logging the index and text of each "li" element to the console.

Real-World Scenario: Creating a Dynamic Table

Now that you understand how to use JQuery Each, let's apply it to a real-world scenario. In this example, we're going to create a dynamic table using JQuery Each. ```html

Name	Age	City

``` First, we create an empty table with three columns: Name, Age, and City. ```javascript var people = [ { name: "John Doe", age: 30, city: "New York" }, { name: "Jane Doe", age: 25, city: "Los Angeles" }, { name: "Bob Smith", age: 50, city: "Chicago" } ]; ``` Next, we create an array of objects representing people with their name, age, and city. ```javascript $.each(people, function(index, person) { var row ="" + person.name + "" + person.age + "" + person.city + ""; $("#myTable tbody").append(row); }); ``` Finally, we use JQuery Each to loop through the array of people and create a new row for each person in the table. We append each row to the table body.

Conclusion

JQuery Each is a powerful method that allows you to iterate over a collection of elements and perform a function on each element. It is useful in many scenarios, including creating dynamic tables, applying styling to multiple elements, and logging data to the console. We hope this tutorial has helped you understand how to use JQuery Each and its application in a real-world scenario.