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App:mounted hooks in apps in detail

Popularity：722 ℃/2024-10-05 11:58:42

title: app:mounted hooks in apps in detail
date: 2024/10/5
updated: 2024/10/5
author: cmdragon

excerpt:
The app:mounted hook plays an important role in the lifecycle of a Vue application, providing timing for execution after a component has been mounted. By utilizing this hook wisely, we can improve the interactivity, user experience, and performance optimization of the component. Ensuring robustness and cleanup mechanisms in its internal code will bring significant improvements to your Vue application.

categories:

  • front-end development

tags:

  • app:mounted
  • life cycle
  • Vue Applications
  • DOM operations
  • Component Rendering
  • hook function

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  1. summarize
  2. Detailed description of the app:mounted hook
    • 2.1 Definition and role of hooks
    • 2.2 timing of call
    • 2.3 Return Values and Exception Handling
  3. Specific use examples
    • 3.1 Execute the logic after the component is rendered
    • 3.2 Third-party library initialization
  4. application scenario
  5. Best practices in real-world development
  6. caveat
  7. key point
  8. exercise question
  9. summarize

1. General

app:mounted is a lifecycle hook in a Vue application that is called as soon as the Vue instance is mounted in the DOM. Running this hook marks the completion of the initial rendering of the component, and is therefore particularly suitable for executing applications that rely on the
DOM logic.

2. Detailed description of app:mounted hooks

2.1 Definition and role of hooks

app:mounted Hooks allow developers to perform a number of actions immediately after a Vue instance has been properly mounted to the DOM. Such operations typically include:

  • Get the live size of a DOM element
  • Perform animation initialization
  • Handling UI-related plugin initialization

2.2 Timing of calls

  • Execution environment: This hook is only executed on the client side. This means that it will not be triggered when running on the server side.
  • timing of mounting: This hook is called when the Vue instance has been created and mounted, i.e. after it has started rendering the DOM. This is the best time to execute logic that involves DOM manipulation or requires real-time updates.

2.3 Return Values and Exception Handling

app:mounted There will be no return value, but rather it will be used to execute the block of code that needs to be run. If an exception is thrown inside this hook, it may interrupt subsequent execution, so there is a need to ensure that the code is robust.

3. Specific examples of use

3.1 Executing Logic after Component Rendering

You can utilize theapp:mounted Hooks access the DOM elements of components after they have been rendered and perform some logic.

// plugins/
export default defineNuxtPlugin({
    hooks: {
        'app:mounted'() {
            const element = ('.my-element');

            // For example, get the width of the element and export it
            if (element) {
                ('Element width:', );
            }
        }
    }
});

In this example, we get the.my-element class of a DOM element and outputs its width on the console.

3.2 Initialization of third-party libraries

app:mounted It can also be used as an initialization of third-party libraries. For example, to initialize the charting library after the application is mounted:

// plugins/
import Chart from '';

export default defineNuxtPlugin({
    hooks: {
        'app:mounted'() {
            const ctx = ('myChart').getContext('2d');
            const myChart = new Chart(ctx, {
                type: 'bar',
                data: {
                    labels: ['Red', 'Blue', 'Yellow', 'Green', 'Purple', 'Orange'],
                    datasets: [{
                        label: '# of Votes',
                        data: [12, 19, 3, 5, 2, 3],
                        backgroundColor: [
                            'rgba(255, 99, 132, 0.2)',
                            'rgba(54, 162, 235, 0.2)',
                            'rgba(255, 206, 86, 0.2)',
                            'rgba(75, 192, 192, 0.2)',
                            'rgba(153, 102, 255, 0.2)',
                            'rgba(255, 159, 64, 0.2)',
                        ],
                        borderColor: [
                            'rgba(255, 99, 132, 1)',
                            'rgba(54, 162, 235, 1)',
                            'rgba(255, 206, 86, 1)',
                            'rgba(75, 192, 192, 1)',
                            'rgba(153, 102, 255, 1)',
                            'rgba(255, 159, 64, 1)',
                        ],
                        borderWidth: 1
                    }]
                },
                options: {
                    scales: {
                        y: {
                            beginAtZero: true
                        }
                    }
                }
            });
        }
    }
});

In this example, we initialize a simple bar chart after the DOM finishes mounting.

4. Application scenarios

  1. Dynamic style or layout handling: Adjusts the layout according to the initial state of the DOM element (e.g. width, height).
  2. event binding: Bind custom event listeners to the component's DOM elements.
  3. third-party repository: Initialization of third-party libraries that require DOM, such as charting libraries, map tools, etc.

5. Best practices in practical development

  1. Avoiding blockages:: Avoid as much as possible theapp:mounted Time-consuming operations are performed within hooks to maintain a good user experience.
  2. conditional logic: Ensure that DOM elements are checked for existence and availability before accessing them.
  3. Liquidation of resources: If an event is bound or a timer is created, make sure that the component is not destroyed until the component is destroyed (e.g., thebeforeDestroy (hooks) when cleaning.

6. Cautions

  • asynchronous request: Inapp:mounted When initiating asynchronous requests within, state management and data handling must be done to avoid undefined state.
  • beta (software): Ensure that DOM-dependent functionality is well tested for differences in performance across browsers or environments.

7. Key points

  • app:mounted is an important lifecycle hook that only executes on the client.
  • For performing DOM-related operations after component initialization.
  • Attention needs to be paid to handling exceptions and ensuring that resources are cleared in a timely manner.

8. Exercise questions

  1. Dynamic Style Adjustment: Write a plug-in to theapp:mounted The CSS styles of a component are adjusted to the size of the window in the
  2. event listener:: Utilizationapp:mounted Adds a click event listener to a specific element and prints information about it when clicked.
  3. redrawing table: Implement a feature that redraws the chart and displays the updated data when the window size changes.

9. Summary

app:mounted Hooks play an important role in the lifecycle of a Vue application, providing timing for execution after a component has been mounted. By utilizing this hook wisely, we are able to improve the interactivity, user experience, and performance optimization of the component. Ensuring robustness and cleanup mechanisms in its internal code will provide a great opportunity for your
Vue apps bring significant enhancements.

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