How to get json value with jquery

As a Javascript library, Jquery is very powerful and flexible in processing JSON data. In this article, we will explore how to use Jquery to get JSON values.

Introduction to JSON
JSON (JavaScript Object Notation) is a lightweight data exchange format that exists in text format. It is not only easy for humans to read, but also easy for machines to parse and generate. JSON has the following characteristics:

• It is similar to JavaScript’s object literal syntax
• It is a plain text format and has a hierarchical structure similar to XML
• Can be read and generated by any programming language

Generally, the value of JSON can be the following data types:

• Number (integer or floating point number)
• String (in double quotes)
• Logical value (true or false)
• Array (in brackets [])
• Object (in Curly brackets {})
• null

In Jquery, you can use the $.parseJSON() or $().parseJSON() method to convert JSON data into a Javascript object. Using this method, you can access the properties of a Javascript object.

The following is an example of JSON:

{

"name": "John Smith",
"age": 30,
"city": "New York"

}

This JSON contains three attributes: name, age and city. Now let's see how to get the values ​​of these properties in Jquery.

Use Jquery to get the JSON attribute value

We can get the JSON attribute value in the following ways:

1. Use dot notation:

You can use a Dot notation to access the properties of a JSON object. Here is an example:

var obj = {"name": "John Smith", "age": 30, "city": "New York"};
console.log(obj.name ); //"John Smith"

2. Use square bracket notation:

You can use square bracket notation to access the properties of the JSON object. Here is an example:

var obj = {"name": "John Smith", "age": 30, "city": "New York"};
console.log(obj[" name"]); //"John Smith"

Where, if the attribute name contains spaces or other special characters, they must be enclosed in parentheses.

3. Use the .each() iterator: The

$().each() method is a very useful tool that can be used to traverse a set of elements and operate on them. It can be used to iterate over the properties of an object when processing JSON data.

The following is an example:

var obj = {"name": "John Smith", "age": 30, "city": "New York"};
$ .each(obj, function(key, value) {

console.log(key + ": " + value);

});

This will iterate over each property of the object and then output their key-value pairs.

Summary

In this article, we introduced how to get values ​​from JSON data using Jquery. We can use dot notation or square bracket notation to access the properties of the JSON object, or we can use the .each() iterator to iterate the properties of the object. This is a powerful feature of Jquery that makes it very convenient to process and manipulate JSON data.

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