我正在实现一个非常简单的React登录页面。我从以下组件Account开始。
var Account = React.createClass({
getInitialState: function() {
return {
showSignUp: false,
showLogin: true
}
},
update: function(data) {
this.setState(data);
},
render: function() {
if(this.state.showSignUp) {
return <SignUp/>
}
else {
return <Login update={this.update}/>
}
}
});
正如预期的那样,登录组件被显示并呈现如下内容:
return (
<div>
<p><input type="text" placeholder={Language.languagePack.account.username} onChange={this.usernameChange}/></p>
<p><input type="password" placeholder={Language.languagePack.account.password} onChange={this.passwordChange}/></p>
<p><a onClick={this.performLogin}>{Language.languagePack.account.login}</a></p>
<p><a onClick={this.handleSignUp}>{Language.languagePack.account.signUp}</a></p>
<p>{failedMessage}</p>
</div>
)
这一切都很正常。应用程序通过onChange钩子接收到更改。如果用户点击“注册”,则会调用以下代码:
handleSignUp: function() {
this.props.update({showSignUp: true, showLogin: false})
},
这会调用Account类中的update方法,该方法会更新状态并导致重新渲染。这就是使其切换到SignUp组件的原因。
return (
<div id="signUp">
<p><input type="text" placeholder={Language.languagePack.account.username} onChange={this.usernameChange} /></p>
<p><input type="password" placeholder={Language.languagePack.account.password} onChange={this.passwordChange} /></p>
<p><input type="email" placeholder={Language.languagePack.account.email} onChange={this.emailChange} /></p>
<p><a onClick={this.handleSignUp}>{Language.languagePack.account.signUp}</a></p>
</div>
)
由于某种原因,这里没有触发任何事件。onChange或onClick似乎未被注册。我认为这与我的实现有关,根据状态更改切换组件来呈现不同的组件。我的问题是,为什么会发生这种情况,我在React中哪个部分存在误解导致了这种情况?
完整的类
登录组件
var Login = React.createClass({
getInitialState: function() {
return {
username: '',
password: '',
failed: false
}
},
usernameChange: function(event) {
this.setState({
username: event.target.value,
failed: false
});
},
passwordChange: function(event) {
this.setState({
password: event.target.value,
failed: false
});
},
performLogin: function() {
var username = this.state.username;
var password = this.state.password;
console.log("Attempting login with username " + username + " and password " + password);
var _this = this;
Api.login(username, password, function(response) {
_this.props.update({user: response, loggedIn: true});
},
function(response) {
_this.setState({failed: true});
})
},
handleSignUp: function() {
this.props.update({showSignUp: true, showLogin: false})
},
render: function() {
var failedMessage = null;
if(this.state.failed) {
failedMessage = <div className="failed-auth">{Language.languagePack.account.invalidCredentials}</div>;
}
return (
<div>
<p><input type="text" placeholder={Language.languagePack.account.username} onChange={this.usernameChange}/></p>
<p><input type="password" placeholder={Language.languagePack.account.password} onChange={this.passwordChange}/></p>
<p><a onClick={this.performLogin}>{Language.languagePack.account.login}</a></p>
<p><a onClick={this.handleSignUp}>{Language.languagePack.account.signUp}</a></p>
<p>{failedMessage}</p>
</div>
)
}
});
注册组件
var SignUp = React.createClass({
getInitialState : function() {
return {
username: '',
password: '',
email: ''
}
},
usernameChange: function(event) {
this.setState({
username: event.target.value
});
},
passwordChange: function(event) {
this.setState({
password: event.target.value
});
},
emailChange: function(event) {
this.setState({
email: event.target.value
});
},
handleSignUp : function() {
var username = this.state.username;
var password = this.state.password;
var email = this.state.email;
console.log("Signing up with username=" + username + " and password=" + password + "and email=" + email);
},
handleLogin : function() {
console.log("Fired!");
},
render: function () {
return (
<div id="signUp">
<p><input type="text" placeholder={Language.languagePack.account.username} onChange={this.usernameChange} /></p>
<p><input type="password" placeholder={Language.languagePack.account.password} onChange={this.passwordChange} /></p>
<p><input type="email" placeholder={Language.languagePack.account.email} onChange={this.emailChange} /></p>
<p><a onClick={this.handleSignUp}>{Language.languagePack.account.signUp}</a></p>
</div>
)
}
});