js convert jquery object array object array

In front-end development, we often use two languages, JavaScript and jQuery, which have advantages in different scenarios. But in the actual development process, we often need to convert between the two languages. Among them, one of the more common questions is how to convert JavaScript arrays or objects into jQuery object arrays or object arrays. This article will systematically introduce how to perform this conversion.

First of all, we need to know that JavaScript array is a very common data type. It can store any type of data, and we can perform a series of operations such as sorting, filtering, and mapping on it. The jQuery object array is an array composed of multiple jQuery objects. Each jQuery object is an object created by a selector that references a DOM document element. In practical applications, we may need to convert JavaScript arrays into jQuery object arrays, or JavaScript objects into jQuery object arrays.

Below we will introduce the specific steps of these two conversions respectively.

1. Convert JavaScript array to jQuery object array

Suppose we have a JavaScript array that contains multiple DOM elements. We can convert it to jQuery object array:

var arr = [document.getElementById('id1'), document.getElementById('id2'), document.getElementById('id3')];
var $arr = $(arr); // 将JavaScript数组转换为jQuery对象数组

In the above code, we first obtain multiple DOM elements through JavaScript arrays, and then use jQuery's selector to encapsulate them into a jQuery object array. So we can use arrays to operate on these DOM elements in native JavaScript, or we can use jQuery arrays to operate on them.

2. Convert JavaScript object to jQuery object array

Another conversion method is to convert JavaScript object to jQuery object array. This conversion method is relatively common and is often used for data processing and DOM operations. The following are the specific steps to convert JavaScript objects into jQuery object arrays:

var obj = [
    {name: 'A', value: 1},
    {name: 'B', value: 2},
    {name: 'C', value: 3}
];
var $obj = $.map(obj, function (item) {
    return $('<div>').addClass(item.name).text(item.value)[0];
});

In the above code, we first define an array of JavaScript objects, each object contains two attributes, namely name and value. Next, we converted the object array through jQuery's map method, converted each object into a jQuery object, and set certain styles and text on it. Finally, add these jQuery objects to the $j object array.

It is worth noting that since the map method returns an array rather than a jQuery object, we also need to convert these elements into an array of jQuery objects through the first jQuery method.

In actual development, we may combine multiple methods to convert different data. For example, we can convert server data to JavaScript data types after getting it. Then, convert the JavaScript array or object to a jQuery object array. This is used to implement data binding and operations. This approach is generally called data binding or the MVVM pattern and is a very useful development technique.

Summary:

This article explains how to convert a JavaScript array or object to a jQuery object array or object array. The two conversion methods are suitable for different scenarios, and developers can choose according to actual needs. At the same time, understanding these conversion methods will also help developers better understand and master the characteristics of JavaScript and jQuery.

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