3. React

  • 3.1. React tutorial

    React is a JAVASCRIPT library for building user interfaces. React...
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  • 3.2. React installation

    React can be downloaded and used directly, and many learning examples are provided in the download package. T...
    2024-03-15 23:00:03 UTC
  • 3.3. React element rendering

    Elements are the smallest units that make up a React application and are used to describe what is output on the screen...
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  • 3.4. React JSX

    React use JSX instead of regular JavaScript. JSX is a JavaScript syntax extension that...
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  • 3.5. React component

    In this section we will discuss how to use components to make our application easier to manage. Next, let’s p...
    2024-03-15 23:00:03 UTC
  • 3.6. React State

    React treats components as a state machine (State Machines). Achieve different states by interacting with the user, an...
    2024-03-15 23:00:03 UTC
  • 3.7. React Props

    state and props the main difference is that props ...
    2024-03-14 23:00:04 UTC
  • 3.8. React event handling

    React element event handling and DOM elements are similar. But there ...
    2024-03-15 23:00:03 UTC
  • 3.9. React conditional rendering

    In React can create different components to encapsulate the various behaviors you need. You ...
    2024-03-14 23:00:04 UTC
  • 3.10. React list & Keys

    We can use JavaScript’s map() method to create a list. 3.10.1. ...
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  • 3.11. React component API

    In this section we will discuss the React component API. We will explain the following seven methods: ...
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  • 3.12. React component life cycle

    In this section we will discuss the life cycle of React components. The lifecycle of a component can be divid...
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  • 3.13. React constructor() method

    constructor() : The format of the method is as follows: constructor(props) ...
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  • 3.14. React getDerivedStateFromProps () method

    getDerivedStateFromProps() the format of the method is as follows: static getDeri...
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  • 3.15. React render() method

    The render() format of the method is as follows: ReactDOM.render(element, cont...
    2024-03-14 23:00:03 UTC
  • 3.16. React componentDidMount() method

    The componentDidMount() format of the method is as follows: componentDidMount(...
    2024-03-14 23:00:03 UTC
Principles, Technologies, and Methods of Geographic Information Systems  102

In recent years, Geographic Information Systems (GIS) have undergone rapid development in both theoretical and practical dimensions. GIS has been widely applied for modeling and decision-making support across various fields such as urban management, regional planning, and environmental remediation, establishing geographic information as a vital component of the information era. The introduction of the “Digital Earth” concept has further accelerated the advancement of GIS, which serves as its technical foundation. Concurrently, scholars have been dedicated to theoretical research in areas like spatial cognition, spatial data uncertainty, and the formalization of spatial relationships. This reflects the dual nature of GIS as both an applied technology and an academic discipline, with the two aspects forming a mutually reinforcing cycle of progress.