How to convert jquery js objects

When developing web applications, jQuery is a very important tool and is often used to handle DOM operations and events. In jQuery, we often need to operate JavaScript objects, so object conversion is a very common operation. In this article we will learn how to convert jquery js objects.

1. Convert js objects into jQuery objects

jQuery objects are composed of existing DOM objects and newly created DOM objects. We can use jQuery functions to convert JavaScript objects into jQuery objects. Here are some examples:

var jsObj = { name: 'John', age: 30 };
var jqueryObj = $(jsObj);

The above code converts jsObj into a jQuery object jqueryObj. We can use the following methods to get the property values ​​of jQuery objects:

jqueryObj.prop('name');  // 输出 "John"
jqueryObj.prop('age');  // 输出 "30"

2. Convert jQuery objects to js objects

If we need to convert jQuery objects into JavaScript objects, we can use jQuery objects .toArray() method or jQuery object .get() method. Here are some examples:

var jqueryObj = $('#element');
var jsObj = jqueryObj.toArray();
var jsObj = jqueryObj.get();

The above code converts jqueryObj to jsObj. If you only want to get the value of a certain attribute, you can use the following method:

var jsObj = { name: 'John', age: 30 };
var jqueryObj = $(jsObj);

var name = jqueryObj.prop('name');
var age = jqueryObj.prop('age');

var jsObj = { name: name, age: age };
console.log(jsObj);  // 输出 { name: 'John', age: 30 }

3. Convert jQuery object to JSON object

If you want to convert jQuery object to JSON object, you can use The JSON.stringify() function that comes with the jQuery object. Here are some examples:

var jqueryObj = $('#element');

var jsonObj = JSON.stringify(jqueryObj);
console.log(jsonObj);  // 输出 {"0":{"nodeType":1,"tagName":"DIV","attributes":{"id":{"name":"id","value":"element"}},"classList":{"0":"some-class"},"style":{}},"length":1}

The above code converts jQuery objects into json formatted string output. Note that if an underscore ("_") appears in a property name when serialized, the string will retain the underscore ("_"). This is valid in JavaScript objects, but not in JSON. Therefore, if your property name contains underscores, you will need to use an alternative method to serialize it to a JSON object.

4. Convert JSON objects into JavaScript objects

If you want to convert JSON objects into JavaScript objects, you can use the JSON.parse() function that comes with the jQuery object. Here are some examples:

var jsonObj = '{"name":"John","age":30}';
var jsObj = JSON.parse(jsonObj);

console.log(jsObj);  // 输出 { name: 'John', age: 30 }

The above code converts the json format string into a JavaScript object, and the output result is a JavaScript object. It is important to note that if your property name contains underscores, you will need to use an alternative method to serialize it to a JSON object.

Summary

In jQuery development, we often need to perform object conversion, such as converting JavaScript objects to jQuery objects, converting jQuery objects to JavaScript objects, converting jQuery objects to JSON objects, Convert JSON objects to JavaScript objects. This article introduces the relevant jQuery API and gives examples for these object conversion operations. Hope this article is helpful to you.

The above is the detailed content of How to convert jquery js objects. For more information, please follow other related articles on the PHP Chinese website!