Reactjs 我是新的反应,当我点击提交按钮时,什么都没有发生?
这是代码强> 实际上,这是一个非常新的反应,我正在处理一个项目,该项目即将列出待办事项,但在执行此操作时,我一直在渲染列表项中输入字段的输出。如果有其他解决方案,如没有列表组,这将是非常有益的 我在哪里犯了真正的错误请有人看看这个 提前谢谢Reactjs 我是新的反应,当我点击提交按钮时,什么都没有发生?,reactjs,onsubmit,Reactjs,Onsubmit,这是代码 实际上,这是一个非常新的反应,我正在处理一个项目,该项目即将列出待办事项,但在执行此操作时,我一直在渲染列表项中输入字段的输出。如果有其他解决方案,如没有列表组,这将是非常有益的 我在哪里犯了真正的错误请有人看看这个 提前谢谢 import React, { Component, Fragment } from "react"; class MainPage extends Component { state = { data: "" };
import React, { Component, Fragment } from "react";
class MainPage extends Component {
state = { data: "" };
handleChange = (e) => {
e.preventDefault();};
handleSubmit = (e) => {
e.preventDefault();
this.setState({ data: e.target.value });
};
render() {
const mystyle = {
padding: "16px 16px 16px 60px",
textAlign: "start",
fontSize: "24px",
fontFamily: 'Helvetica Neue", Helvetica, Arial, sans-serif',
width: "500px",
};
return (
<Fragment>
<h1 className="display-1 text-center" style={{ color: "#f7c6c6" }}>
todos
</h1>
<form className="todo-form" onSubmit={this.handleSubmit}>
<input
type="text"
onChange={this.handleChange.bind(this)}
className="new-todo shadow-lg p-3 mb-5 bg-white rounded"
style={mystyle}
placeholder="What needs to be done?"
/>
<button className="btn btn-primary btn-sm ml-3">Submit</button>
<ul className="list-group">
<li
className="list-group-item disabled p-3 mb-5 w-50 p-3 mx-auto "
style={{ width: "200px", fontSize: "24px" }}
>
{this.state.data}
</li>
</ul>
</form>
</Fragment>
);}}
import React,{Component,Fragment}来自“React”;
类主页扩展组件{
状态={data::};
handleChange=(e)=>{
e、 preventDefault();};
handleSubmit=(e)=>{
e、 预防默认值();
this.setState({data:e.target.value});
};
render(){
常量mystyle={
填充:“16px 16px 16px 60px”,
textAlign:“开始”,
字体大小:“24px”,
fontFamily:“Helvetica Neue”,Helvetica,Arial,无衬线,
宽度:“500px”,
};
返回(
待办事项
提交
-
{this.state.data}
);}}
导出默认主页;从“React”导入React,{Component,Fragment};
import React, { Component, Fragment } from "react";
class MainPage extends Component {
state = { data: "" };
handleSubmit = (e) => {
e.preventDefault();
alert(data)
};
render() {
const mystyle = {
padding: "16px 16px 16px 60px",
textAlign: "start",
fontSize: "24px",
fontFamily: 'Helvetica Neue", Helvetica, Arial, sans-serif',
width: "500px",
};
return (
<Fragment>
<h1 className="display-1 text-center" style={{ color: "#f7c6c6" }}>
todos
</h1>
<form className="todo-form" onSubmit={this.handleSubmit}>
<input
type="text"
onChange={(e) => this.setState({data: e.target.value})}
className="new-todo shadow-lg p-3 mb-5 bg-white rounded"
style={mystyle}
placeholder="What needs to be done?"
/>
<button className="btn btn-primary btn-sm ml-3">Submit</button>
<ul className="list-group">
<li
className="list-group-item disabled p-3 mb-5 w-50 p-3 mx-auto "
style={{ width: "200px", fontSize: "24px" }}
>
{this.state.data}
</li>
</ul>
</form>
</Fragment>
);}}
类主页扩展组件{
状态={data::};
handleSubmit=(e)=>{
e、 预防默认值();
警报(数据)
};
render(){
常量mystyle={
填充:“16px 16px 16px 60px”,
textAlign:“开始”,
字体大小:“24px”,
fontFamily:“Helvetica Neue”,Helvetica,Arial,无衬线,
宽度:“500px”,
};
返回(
待办事项
this.setState({data:e.target.value})
className=“新todo shadow lg p-3 mb-5 bg白色圆形”
style={mystyle}
占位符=“需要做什么?”
/>
提交
-
{this.state.data}
);}}
像这样尝试:
state = { data: "", FinalDataValue:"" };
handleChange = (e) => {
e.preventDefault();
this.setState({ data: e.target.value });};
handleSubmit = (e) => {
e.preventDefault();
this.setState({ FinalDataValue:this.state.data });};
在render in列表中,按如下方式编写:
<li
className="list-group-item disabled p-3 mb-5 w-50 p-3 mx-auto "
style={{ width: "200px", fontSize: "24px" }}
>
{this.state.FinalDataValue}
</li>
{this.state.FinalDataValue}
您的代码中存在一些问题:
type=“submit”
onSubmit
,但它没有e.target.value
,您需要在onHandleChage
import React, { Component, Fragment } from "react";
class MainPage extends Component {
state = { data: [], input: "" };
handleChange = (e) => {
e.preventDefault();
this.setState({ input: e.target.value });
};
handleSubmit = (e) => {
e.preventDefault();
this.setState({ data: [...this.state.data, this.state.input], input: "" });
};
render() {
const mystyle = {
padding: "16px 16px 16px 60px",
textAlign: "start",
fontSize: "24px",
fontFamily: 'Helvetica Neue", Helvetica, Arial, sans-serif',
width: "500px"
};
return (
<Fragment>
<h1 className="display-1 text-center" style={{ color: "#f7c6c6" }}>
todos
</h1>
<form className="todo-form" onSubmit={this.handleSubmit}>
<input
type="text"
onChange={this.handleChange.bind(this)}
value={this.state.input}
className="new-todo shadow-lg p-3 mb-5 bg-white rounded"
style={mystyle}
placeholder="What needs to be done?"
/>
<button className="btn btn-primary btn-sm ml-3" type="submit">
Submit
</button>
<ul className="list-group">
{this.state.data.map((data, i) => {
return (
<li
className="list-group-item disabled p-3 mb-5 w-50 p-3 mx-auto "
style={{ width: "200px", fontSize: "24px" }}
key={"todo-" + i}
>
{data}
</li>
);
})}
</ul>
</form>
</Fragment>
);
}
}
export default function App() {
return (
<div className="App">
<MainPage />
</div>
);
}
import React,{Component,Fragment}来自“React”;
类主页扩展组件{
状态={data:[],输入:'};
handleChange=(e)=>{
e、 预防默认值();
this.setState({input:e.target.value});
};
handleSubmit=(e)=>{
e、 预防默认值();
this.setState({data:[…this.state.data,this.state.input],输入:“”);
};
render(){
常量mystyle={
填充:“16px 16px 16px 60px”,
textAlign:“开始”,
字体大小:“24px”,
fontFamily:“Helvetica Neue”,Helvetica,Arial,无衬线,
宽度:“500px”
};
返回(
待办事项
提交
{this.state.data.map((数据,i)=>{
返回(
-
{data}
);
})}
);
}
}
导出默认函数App(){
返回(
);
}
下面是演示:尝试将type=“submit”添加到您的按钮我尝试过了,效果非常好!非常感谢!
state = { data: [], input: "" };
import React, { Component, Fragment } from "react";
class MainPage extends Component {
state = { data: [], input: "" };
handleChange = (e) => {
e.preventDefault();
this.setState({ input: e.target.value });
};
handleSubmit = (e) => {
e.preventDefault();
this.setState({ data: [...this.state.data, this.state.input], input: "" });
};
render() {
const mystyle = {
padding: "16px 16px 16px 60px",
textAlign: "start",
fontSize: "24px",
fontFamily: 'Helvetica Neue", Helvetica, Arial, sans-serif',
width: "500px"
};
return (
<Fragment>
<h1 className="display-1 text-center" style={{ color: "#f7c6c6" }}>
todos
</h1>
<form className="todo-form" onSubmit={this.handleSubmit}>
<input
type="text"
onChange={this.handleChange.bind(this)}
value={this.state.input}
className="new-todo shadow-lg p-3 mb-5 bg-white rounded"
style={mystyle}
placeholder="What needs to be done?"
/>
<button className="btn btn-primary btn-sm ml-3" type="submit">
Submit
</button>
<ul className="list-group">
{this.state.data.map((data, i) => {
return (
<li
className="list-group-item disabled p-3 mb-5 w-50 p-3 mx-auto "
style={{ width: "200px", fontSize: "24px" }}
key={"todo-" + i}
>
{data}
</li>
);
})}
</ul>
</form>
</Fragment>
);
}
}
export default function App() {
return (
<div className="App">
<MainPage />
</div>
);
}