我有这个表单,我想发送这些值。我知道我们必须使用<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
来存储数据,但它如何用于setState()
?
以下是代码:
input type="hidden"
答案 0 :(得分:5)
对于你的所有问题,答案都很复杂。
首先,它取决于任务:如果您只想在表单提交时向服务器发送异步请求,则不需要使用Component
状态。以下是documentation相关部分的链接。并使用refs访问输入数据。
class FormComponent extends React.Component {
constructor(props) {
super(props);
this.onSubmit = this.onSubmit.bind(this);
}
onSubmit(e) {
e.preventDefault();
// Send your ajax query via jQuery or Axios (I prefer Axios)
axios.get('your_url', {
params: {
action: this.actionInput.value,
email: this.emailInput.value,
password: this.passwordInput.value,
}
})
.then(function (response) {
console.log(response);
})
.catch(function (error) {
console.log(error);
});
}
render() {
return (
<form onSubmit={this.onSubmit}>
<input type="hidden" name="action" value="login"
ref={(input) => { this.actionInput = input }} />
<input type="email" name="email_user" placeholder="Email"
ref={(input) => { this.emailInput = input }}/>
<input type="password" name="password_user" placeholder="Mot de passe"
ref={(input) => { this.passwordInput = input }}/>
<button type="submit">Login</button>
</form>
);
}
}
答案 1 :(得分:1)
回答你的问题:
由于您知道如何使用组件的状态,因此您可以将值设置为:<input type='text' value={this.state.foo} />
或甚至通过道具传递<input type='hidden' value={this.props.foo} />
您根本不需要序列化任何内容。使用组件的本地状态甚至是Redux或Flux等状态容器来选择适当的数据。看看这个相当简单的例子:
var SuperForm = React.createClass({
getInitialState() {
return {
name: 'foo',
email: 'baz@example.com'
};
},
submit(e){
e.preventDefault();
console.log("send via AJAX", this.state)
},
change(e,key){
const newState = {};
newState[key] = e.currentTarget.value;
this.setState(newState)
},
render: function() {
return (
<div>
<label>Name</label>
<input
onChange={(e) => this.change(e,'name')}
type="text"
value={this.state.name} />
<label>Email</label>
<input
onChange={(e) => this.change(e,'email')}
type="text"
value={this.state.email} />
<button onClick={this.submit}>Submit</button>
</div>
);
}});
AJAX是一组Web开发技术,而Axios是一个JavaScript框架。您可以使用jQuery,Axios甚至是vanilla JavaScript。
答案 2 :(得分:0)
所有数据都可以存储在React的状态下,但是如果您仍然需要在表单上进行输入,则可以执行以下操作:
const handleSubmit = e => {
e.preventDefault();
const inputs = Object.values(e.target)
.filter(c => typeof c.tagName === 'string' && c.tagName.toLowerCase() === 'input')
.reduce((acc, curr) => ({ ...acc, [curr.name]: curr.value }), {});
setFormVals({ ...formVals, ...inputs });
}
请参见下面的演示
const Demo = () => {
const [formValues] = React.useState({});
const handleSubmit = e => {
e.preventDefault();
const inputs = Object.values(e.target)
.filter(c => typeof c.tagName === 'string' && c.tagName.toLowerCase() === 'input')
.reduce((acc, curr) => ({ ...acc, [curr.name]: curr.value }), {});
console.log(inputs);
}
return (
<form onSubmit={handleSubmit}>
<input name="name" placeholder="Name" value={formValues.name} />
<input name="email" placeholder="Email" value={formValues.email} />
<input name="hiddenInput" value="hiddenValue" type="hidden" />
<button type="submit">Submit</button>
</form>
);
}
ReactDOM.render(<Demo />, document.getElementById('demo'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.0/umd/react-dom.production.min.js"></script>
<div id="demo"></div>
如果知道所需的输入内容,则可以执行以下操作:
const Demo = () => {
const formRef = React.useRef(null);
const [formValues, setFormValues] = React.useState({});
const handleChange = e => {
setFormValues({
...formValues,
[e.target.name]: e.target.value,
});
}
const handleSubmit = e => {
e.preventDefault();
setFormValues({ ...formValues, hiddenInput: formRef.current.hiddenInput.value });
}
return (
<form onSubmit={handleSubmit} ref={formRef}>
<input name="name" placeholder="Name" value={formValues.name} onChange={handleChange} />
<input name="email" placeholder="Email" value={formValues.email} onChange={handleChange} />
<input name="hiddenInput" value="hiddenValue" type="hidden" />
<button type="submit">Submit</button>
<pre>{JSON.stringify(formValues, null, 2)}</pre>
</form>
);
}
ReactDOM.render(<Demo />, document.getElementById('demo'));
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/17.0.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/17.0.0/umd/react-dom.production.min.js"></script>
<div id="demo"></div>