String conversion jquery object

In front-end development, we often need to manipulate DOM elements to achieve various effects. jQuery is a powerful and convenient library that can easily select and manipulate DOM elements, making front-end development easier. However, when we get a piece of HTML code or text string from the server side, how to convert it into a jQuery object?

This article will introduce how to use jQuery to convert a string into a jQuery object, and provide code examples for two common scenarios.

Method 1: Use the $() function

jQuery provides a commonly used function $(), which allows us to select DOM elements in the form of strings and return a jQuery object. Therefore, we can use this function to convert a string into a jQuery object.

The following is a simple example:

var str = "<div>hello world</div>";
var $div = $(str);  // 将字符串转换为jQuery对象
$("body").append($div);  // 将$div插入到body标签中

In this example, we first create a string containing HTML code and assign it to the variable str. Next, the string is converted into a jQuery object $div through the $() function. Finally, use the append() function to insert the $div into the body tag.

It should be noted that when using the $() function to convert a string into a jQuery object, the string we pass to the $() function must be a legal HTML code, otherwise an error will be thrown.

Method 2: Use parseHTML() function

In addition to the $() function, jQuery also provides a parseHTML() function for parsing a string into an array of DOM elements and returning A jQuery object. The implementation of this function is relatively complex, but it can handle some challenging HTML codes, such as special characters, self-closing tags, etc.

The following is an example:

var str = "<div>hello world</div>";
var domArray = $.parseHTML(str);  // 将字符串解析为DOM元素数组
var $div = $(domArray[0]);  // 将DOM元素转换为jQuery对象
$("body").append($div);  // 将$div插入到body标签中

In this example, we first parse the string into an array of DOM elements through the parseHTML() function and assign it to the variable domArray. Since the parseHTML() function returns an array of DOM elements, we need to manually convert it to a jQuery object.

It should be noted that the parseHTML() function may automatically delete some special characters, such as spaces, newlines, etc., when parsing a string. If we need to retain these characters, we can use the following code:

var str = "<div>hello world</div>";
var domArray = $.parseHTML(str, true);  // 保留特殊字符
var $div = $(domArray[0]);  // 将DOM元素转换为jQuery对象
$("body").append($div);  // 将$div插入到body标签中

In this example, we passed in the second parameter true when calling the parseHTML() function, which means to retain special characters. In this way, when parsing a string into an array of DOM elements, the parseHTML() function will retain special characters such as spaces and newlines.

Summary

In front-end development, we often need to convert strings into jQuery objects to facilitate the manipulation of DOM elements. jQuery provides the $() function and parseHTML() function to help us easily implement this conversion process. It is necessary to choose the appropriate function to process strings according to specific scenarios to ensure the reliability and efficiency of the code.

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