Vanilla JS / HTML / CSS-我打开模式弹出窗口-输入字段应获得自动聚焦

问题描述

1. 我的项目中有一个模态，当单击按钮时弹出：

        <div class="modal modal-visually-hidden">
            <h3 class="modal__header">Оставить отзыв</h3>
            <button name="Close the window" class="modal__close-button">x</button>
            <div class="modal__form-container">
                <form id="modal__form" action="#">
                    <label for="modal__form--name">Пожалуйста,заполните поле</label>
                    <input id="modal__form--name" type="text" placeholder="Имя" required> <!--this is the field needed to autofocus on modal open event-->
                    <input id="modal__form--qualities" type="text" placeholder="Достоинства">
                    <input id="modal__form--drawbacks" type="text" placeholder="Недостатки">
                    <input id="modal__form--submit" class="global-hover" type="submit" value="оставить отзыв">
                </form>
            </div>

1. 这是弹出模式的按钮：

                    <div class="Feedback__button-container">
                        <button name="Leave a Feedback" id="Feedback__button" class="Feedback__button">оставить отзыв</button> 
                    </div>

1. 我使用以下JS来显示弹出窗口：

const activatePopupButton = document.querySelector('#Feedback__button');    
        const commentPopup = document.querySelector('.modal');
        const closePopupButton = document.querySelector('.modal__close-button');
        const nameInputField = document.querySelector('#modal__form--name'); /* I select the field for further autofocus */


        closePopupButton.addEventListener('click',function() {
            commentPopup.classList.add('modal-visually-hidden');
            document.querySelector('body').style.overflow = 'visible';
        });



        activatePopupButton.addEventListener('click',function() {
            commentPopup.classList.remove('modal-visually-hidden');
            nameInputField.autofocus = true;     /*this line should autofocus the field in question*/
            console.log(nameInputField.autofocus);
            document.querySelector('body').style.overflow = 'hidden';
        });

使用样式为display：none;的类'.modal-visually-hidden'隐藏模块。 当按下按钮时，将显示弹出窗口，并且第一个字段应该与行名InputField.autofocus = true对齐。 但这不会。我在做什么错了？

解决方法

Tick属性将输入集中在页面加载上。 DOM加载后无法设置。相反，请尝试以下操作：

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Lock_Test_2
{
    public partial class Form1 : Form
    {
        Timer timer1;

        readonly object lockObj = new object();

        public Form1()
        {
            InitializeComponent();

            Button button1 = new Button();
            button1.Location = new Point(100,100);
            button1.Size = new Size(187,67);
            button1.Text = "button1";
            button1.Click += button1_Click;
            Controls.Add(button1);

            timer1 = new Timer();
            timer1.Tick += timer1_Tick;
        }

        private void button1_Click(object sender,EventArgs e)
        {
            timer1.Enabled = true;
        }

        private void timer1_Tick(object sender,EventArgs e)
        {
            lock (lockObj)
            {
                MessageBox.Show("Entered the lock!");
                MessageBox.Show("Exiting the lock...");
            }
        }
    }
}