我有一个登录表单的提交按钮,默认情况下处于禁用状态。我想在用户输入有效的用户名/密码时启用它。有很多使用 AngularJS、JQuery 和其他基础设施的示例,但我想知道一种使用 Material Design Lite 来实现这一点的简洁方法。我当前的代码是:
class FrontPage extends Component {
constructor(props, context) {
super(props, context);
this.state = { email: '', password: '' };
}
handleEmailChange() {
this.setState({email: e.target.value})
}
handlePasswordChange() {
this.setState({password: e.target.value})
}
render() {
return(
<form className="frontpage" onSubmit={this.handleLogin}>
<div className="content-grid mdl-grid">
<div className="mdl-cell mdl-textfield mdl-js-textfield">
<input className="mdl-textfield__input" id="email" type="email" value={this.state.email} onChange={this.handleEmailChange}/>
<label className="mdl-textfield__label" htmlFor="email">email...</label>
<span className="mdl-textfield__error">Input is not an email address!</span>
</div>
<div className="mdl-cell mdl-textfield mdl-js-textfield">
<input className="mdl-textfield__input" id="password" type="password" pattern="[A-Z,a-z,0-9\?@\$%&\*\-_=+! ~\.,\/\\]*" value={this.state.password} onChange={this.handlePasswordChange}/>
<label className="mdl-textfield__label" htmlFor="password">password...</label>
<span className="mdl-textfield__error">Input can only contain letters, numbers, and some special characters!</span>
</div>
<div classname="mdl-cell">
<button className="mdl-button mdl-button--raised mdl-button--colored mdl-js-ripple-effect" type="submit" name="login" disabled>Login</button>
</div>
</div>
</form>
)
}
}
最佳答案
<button id='loginBtn' className="mdl-button mdl-button--raised mdl-button--colored mdl-js-ripple-effect" type="submit" name="login" disabled>Login</button>
<script>
function Enable() {
var loginBtn = document.getElementById('loginBtn');
loginBtn.removeAttribute("disabled");
componentHandler.upgradeElement(loginBtn);
}
function Disable() {
var loginBtn = document.getElementById('loginBtn');
loginBtn.setAttribute("disabled","");
componentHandler.upgradeElement(loginBtn);
}
</script>
关于forms - 如何在 Material Design Lite 中根据表单内容启用/禁用提交按钮?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35778569/