[英]React - conditionally not send data key in form submission
我正在嘗試如果選中復選框,則忽略onSubmit
值,從而消除了對特定標簽/輸入的需求。 如果我選中indefinite runTime
框, runTimeSeconds
不再需要在有效負載中發送runTimeSeconds
鍵,這是在handleSubmit方法本身中完成的嗎?
提交表單后,選中此復選框,它仍在發送runTimeSeconds
鍵,並且仍在發送默認狀態值。
這是一個復制問題的沙箱: https : //codesandbox.io/s/5vvpj40rqk
import React from "react";
import ReactDOM from "react-dom";
import "./styles.css";
class Params extends React.Component {
constructor(props) {
super(props);
this.state = {
windowLengthSeconds: 1,
runTimeSeconds: 1,
indefiniteCheckbox: false
};
this.handleChange = this.handleChange.bind(this);
}
handleChange = e => {
this.setState({ [e.target.name]: e.target.value });
this.props.handleChange(e);
console.log([e.target.value]);
const value =
e.target.type === "checkbox" ? e.target.checked : e.target.value;
this.setState({
[e.target.name]: value
});
};
render() {
const { indefiniteCheckbox } = this.state;
return (
<div className="params-boxes">
<div className="checkbox">
<label>Indefinite runTime:</label>
<input
type="checkbox"
name="indefiniteCheckbox"
value={this.state.indefiniteCheckbox}
onChange={this.handleChange}
/>
</div>
{!indefiniteCheckbox && (
<div>
<label>runTimeSeconds:</label>
<input
type="number"
name="runTimeSeconds"
value={this.state.runTimeSeconds}
onChange={this.handleChange}
placeholder="1"
min="1"
required
/>
</div>
)}
<div>
<label>windowLengthSeconds:</label>
<input
type="number"
name="windowLengthSeconds"
value={this.state.windowLengthSeconds}
onChange={this.handleChange}
placeholder="1"
min="1"
step="1"
required
/>
</div>
</div>
);
}
}
class App extends React.Component {
constructor(props) {
super(props);
this.state = {
runtimeSeconds: 1,
windowLengthSeconds: 1,
indefiniteCheckbox: false
};
}
handleChange = ({ target: { name, value } }) => {
this.setState({ [name]: value });
console.log([name, value]);
};
handleSubmit = e => {
e.preventDefault();
data: JSON.stringify({
parameters: {
"stream.runtime.seconds": this.state.runTimeSeconds,
"stream.window.length.seconds": this.state.windowLengthSeconds
}
});
console.log(this.state);
};
render() {
return (
<form onSubmit={this.handleSubmit}>
<div>
<div>
<fieldset>
<legend>Parameters</legend>
<div>
<Params handleChange={this.handleChange} />
</div>
</fieldset>
</div>
</div>
<div className="btn-group">
<span className="input-group-btn">
<button
className="btnSubmit"
handleSubmit={this.handleSubmit}
type="submit"
>
Submit
</button>
<button
className="btnReset"
handleCancel={this.handleCancel}
type="reset"
onClick={() => {
alert(
"Are you sure you want to cancel? Doing so will reset this page."
);
}}
>
Cancel
</button>
</span>
</div>
</form>
);
}
}
const rootElement = document.getElementById("root");
ReactDOM.render(<App />, rootElement);
您有2個選擇。
如果通過使用三元條件選中了復選框,則可以將數據變量設置為undefined
。 在另一種情況下,將發送輸入中給出的時間:
handleSubmit = e => {
e.preventDefault();
const data = JSON.stringify({
parameters: {
"stream.runtime.seconds": !this.state.indefiniteCheckbox ? this.state.runTimeSeconds : undefined,
"stream.window.length.seconds": this.state.windowLengthSeconds
}
});
};
或者,您可以在單獨的變量中創建有效負載,並在條件匹配時從中刪除所需的值:
handleSubmit = e => {
e.preventDefault();
const parameters = {
"stream.runtime.seconds": this.state.runTimeSeconds,
"stream.window.length.seconds": this.state.windowLengthSeconds
}
if (!this.state.indefiniteCheckbox) delete parameters['stream.runtime.seconds']
const data = JSON.stringify({ parameters });
};
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