Ionic4组件-菜单:必须具有"content"元素才能侦听其上的拖动事件

本文介绍了Ionic4组件-菜单:必须具有"content"元素才能侦听其上的拖动事件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有以下代码:

<!doctype html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="ie=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Ionic 4 - Menu</title>
<link rel="stylesheet" href="https://unpkg.com/@ionic/[email protected]/css/ionic.bundle.css" />
<script src="https://unpkg.com/@ionic/[email protected]/dist/ionic.js"></script>
<script>
window.addEventListener('load', event => {
    document.querySelector('.button_details').addEventListener('click', (event) => {
        document.querySelector('.menu_main').toggle();
    });
});
</script>
</head>
<body>

    <ion-menu class="menu_main" side="start">
        <ion-header>
            <ion-toolbar color="secondary">
                <ion-title>Left Menu</ion-title>
            </ion-toolbar>
        </ion-header>
        <ion-content padding>
            Hello World!
        </ion-content>
    </ion-menu>
    <ion-menu-controller></ion-menu-controller>

    <ion-card style="display:inline-block;width:300px">
        <ion-card-header>
            <ion-card-title>Hello World</ion-card-title>
        </ion-card-header>
        <div style="padding:10px 10px;text-align:right;">
            <ion-button color="primary" class="button_details">Details</ion-button>
        </div>
    </ion-card>

</body>

</html>

它工作正常，但有一个例外::页面加载时，控制台上出现以下错误:

It works fine with one exception: when the page loads, there is the following error on the console:

Error: "Menu: must have a 'content' element to listen for drag events on."

这里有CodePen.io:

https://codepen.io/anon/pen/qJgEzZ/?editors= 1011

下面，您可以在StackOverflow上尝试此处的代码:

And below you can try the code right here on StackOverflow:

window.addEventListener('load', event => {
	document.querySelector('.button_details').addEventListener('click', (event) => {
		document.querySelector('.menu_main').toggle();
	});
});

<script src="https://unpkg.com/@ionic/[email protected]/dist/ionic.js"></script>
<link href="https://unpkg.com/@ionic/[email protected]/css/ionic.bundle.css" rel="stylesheet"/>
	<ion-menu class="menu_main" side="start">
		<ion-header>
			<ion-toolbar color="secondary">
				<ion-title>Left Menu</ion-title>
			</ion-toolbar>
		</ion-header>
		<ion-content padding>
			Hello World!
		</ion-content>
	</ion-menu>
	<ion-menu-controller></ion-menu-controller>

	<ion-card style="display:inline-block;width:300px">
		<ion-card-header>
			<ion-card-title>Hello World</ion-card-title>
		</ion-card-header>
		<div style="padding:10px 10px;text-align:right;">
			<ion-button color="primary" class="button_details">Details</ion-button>
		</div>
	</ion-card>

关于如何解决此问题的任何想法?这里缺少什么?

Any idea on how to solve this problem? What is it missing here?

请问我的CodePen.io用正确的代码分叉吗?

Could you please fork my CodePen.io with a proper code?

谢谢！

推荐答案

如果需要代码: 使用content-id="content"和离子含量id="content"

if you want the code: use content-id="content" and on ion-content id="content"

<ion-menu class="menu_main" side="start" content-id="content">
        <ion-header>
            <ion-toolbar color="secondary">
                <ion-title>Left Menu</ion-title>
            </ion-toolbar>
        </ion-header>
        <ion-content padding>
            Hello World!
        </ion-content>
    </ion-menu>
    <ion-menu-controller></ion-menu-controller>

    <ion-content id="content">
     <ion-card style="display:inline-block;width:300px">
        <ion-card-header>
            <ion-card-title>Hello World</ion-card-title>
        </ion-card-header>
        <div style="padding:10px 10px;text-align:right;">
            <ion-button color="primary" class="button_details">Details</ion-button>
        </div>
    </ion-card>
</ion-content>

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