6.5 KiB
6.5 KiB
id | title | challengeType | isRequired | videoUrl | localeTitle |
---|---|---|---|---|---|
5a24c314108439a4d4036179 | Create a Controlled Form | 6 | false | 创建受控表格 |
Description
input
和textarea
等某些元素的内部状态,这使得它们成为受控组件。这也适用于其他表单元素,包括常规HTML form
元素。 Instructions
MyForm
组件设置为带有提交处理程序的空form
。提交表单时将调用提交处理程序。我们添加了一个提交表单的按钮。您可以看到它的type
设置为submit
表明它是控制表单的按钮。在form
添加input
元素并设置其value
和onChange()
属性, onChange()
一个挑战。然后,您应该完成handleSubmit
方法,以便将组件状态属性submit
设置为本地state
的当前输入值。 注意:您还必须在提交处理程序中调用event.preventDefault()
,以防止将刷新网页的默认表单提交行为。最后,在form
之后创建一个h1
标记,该form
从组件的state
呈现submit
值。然后,您可以键入表单并单击按钮(或按Enter键),您应该看到您的输入呈现给页面。 Tests
tests:
- text: <code>MyForm</code>应该返回一个包含<code>form</code>和<code>h1</code>标记的<code>div</code>元素。表单应包含<code>input</code>和<code>button</code> 。
testString: 'assert((() => { const mockedComponent = Enzyme.mount(React.createElement(MyForm)); return (mockedComponent.find("div").children().find("form").length === 1 && mockedComponent.find("div").children().find("h1").length === 1 && mockedComponent.find("form").children().find("input").length === 1 && mockedComponent.find("form").children().find("button").length === 1) })(), "<code>MyForm</code> should return a <code>div</code> element which contains a <code>form</code> and an <code>h1</code> tag. The form should include an <code>input</code> and a <code>button</code>.");'
- text: <code>MyForm</code>的状态应该使用<code>input</code>和<code>submit</code>属性初始化,两者都设置为空字符串。
testString: 'assert(Enzyme.mount(React.createElement(MyForm)).state("input") === "" && Enzyme.mount(React.createElement(MyForm)).state("submit") === "", "The state of <code>MyForm</code> should initialize with <code>input</code> and <code>submit</code> properties, both set to empty strings.");'
- text: 输入<code>input</code>元素应该更新组件状态的<code>input</code>属性。
testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); return waitForIt(() => mockedComponent.state("input"))}; const _2 = () => { mockedComponent.find("input").simulate("change", { target: { value: "TestInput" }}); return waitForIt(() => ({ state: mockedComponent.state("input"), inputVal: mockedComponent.find("input").props().value }))}; const before = await _1(); const after = await _2(); assert(before === "" && after.state === "TestInput" && after.inputVal === "TestInput", "Typing in the <code>input</code> element should update the <code>input</code> property of the component's state."); }; '
- text: 提交表单应该运行<code>handleSubmit</code> ,它应该将<code>submit</code>属性设置为等于当前输入的状态。
testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); mockedComponent.setState({submit: ""}); mockedComponent.find("input").simulate("change", {target: {value: "SubmitInput"}}); return waitForIt(() => mockedComponent.state("submit"))}; const _2 = () => { mockedComponent.find("form").simulate("submit"); return waitForIt(() => mockedComponent.state("submit"))}; const before = await _1(); const after = await _2(); assert(before === "" && after === "SubmitInput", "Submitting the form should run <code>handleSubmit</code> which should set the <code>submit</code> property in state equal to the current input."); };'
- text: <code>h1</code>标头应该从组件的状态呈现<code>submit</code>字段的值。
testString: 'async () => { const waitForIt = (fn) => new Promise((resolve, reject) => setTimeout(() => resolve(fn()), 250)); const mockedComponent = Enzyme.mount(React.createElement(MyForm)); const _1 = () => { mockedComponent.setState({ input: "" }); mockedComponent.setState({submit: ""}); mockedComponent.find("input").simulate("change", {target: {value: "TestInput"}}); return waitForIt(() => mockedComponent.find("h1").text())}; const _2 = () => { mockedComponent.find("form").simulate("submit"); return waitForIt(() => mockedComponent.find("h1").text())}; const before = await _1(); const after = await _2(); assert(before === "" && after === "TestInput", "The <code>h1</code> header should render the value of the <code>submit</code> field from the component's state."); }; '
Challenge Seed
class MyForm extends React.Component {
constructor(props) {
super(props);
this.state = {
input: ",
submit: "
};
this.handleChange = this.handleChange.bind(this);
this.handleSubmit = this.handleSubmit.bind(this);
}
handleChange(event) {
this.setState({
input: event.target.value
});
}
handleSubmit(event) {
// change code below this line
// change code above this line
}
render() {
return (
<div>
<form onSubmit={this.handleSubmit}>
{ /* change code below this line */ }
{ /* change code above this line */ }
<button type='submit'>Submit!</button>
</form>
{ /* change code below this line */ }
{ /* change code above this line */ }
</div>
);
}
};
After Test
console.info('after the test');
Solution
// solution required