activateFocus
MDCTextFieldFoundation
在为框架创建组件时使用 with 。在您的情况下,您似乎正在尝试以编程方式聚焦 MDC 文本字段,因此请改用该focus
方法。
const field = mdc.textField.MDCTextField.attachTo(document.querySelector('.mdc-text-field'));
field.focus();
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Material TextField</title>
<link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:300,400,500,700">
<link href="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.css" rel="stylesheet">
<script src="https://unpkg.com/material-components-web@latest/dist/material-components-web.min.js"></script>
</head>
<body>
<label class="mdc-text-field mdc-text-field--filled">
<span class="mdc-text-field__ripple"></span>
<input class="mdc-text-field__input" type="text">
<span class="mdc-floating-label">Hint text</span>
<span class="mdc-line-ripple"></span>
</label>
</body>
</html>
顺便说一句,如果您希望 TextField 自动关注页面加载,那么您可以将该autofocus
属性添加到input
html 中的元素。