问题
i am developing a form in reactjs using formik plugin plugin link. when i submit form i am getting text fields values but dropdown values are coming empty...
this is my dropdown select
<div className="form-group">
<Field component="select" id="category" name="category" value={this.state.value} className={"form-control"} onChange={ this.handleChange }>
<option value="lokaler">Lokaler</option>
<option value="jobb">Jobb</option>
<option value="saker-ting">Saker & ting</option>
<option value="evenemang">Evenemang</option>
</Field>
</div>
handle submit function
export default withFormik({
enableReinitialize: true,
mapPropsToValues({ category }) {
return {
category: category || ''
}
},
handleSubmit(values, { setStatus, setErrors }){
console.log("data is this: ");
console.log(values); //here i am getting all form fields values except select value returning empty value
console.log("category: "+values.category);// here i always get empty value but not getting selected value
}
i am getting all text fields values in handle submit function but i am not able to get dropdown selected value....kindly tell me how to get dropdown select value in handle submit function ?
回答1:
I also faced this problem yesterday. My problem was to submit form that contains ant design dropdown. I finally make it work after hours of:
- revisiting the Formik Docs
- watch Andrew Mead's video Better React Form with Formik again.
- also viewing Jared Palmer's Working with 3rd-party inputs #1: react-select
The doc said you need to set onChange, onBlur events to setFieldValue, setFieldTouched props respectively like 3rd-party input example:
<MySelect
value={values.topics}
onChange={setFieldValue}
onBlur={setFieldTouched}
error={errors.topics}
touched={touched.topics}
/>
So to my problem, I need to change a bit:
<Select
{...field}
onChange={(value) => setFieldValue('fruitName', value)}
onBlur={()=> setFieldTouched('fruitName', true)}
value={values.fruitName}
...
>
...
</Select>
Hope this will help.
Here is my CodeSandbox
回答2:
A more robust way to handle select components whilst using Formik would be to also use Jed Watsons react-select component. The two work together nicely and abstract away a lot of the boilerplate you would normally need to implement to get the component working seamlessly with Formik.
I have forked a simple example from Jared Palmer's react-select / Formik example on codesandbox and adjusted it to reflect your code above.
import "./formik-demo.css";
import React from "react";
import { render } from "react-dom";
import { withFormik } from "formik";
import Select from "react-select";
import "react-select/dist/react-select.css";
const options = [
{ value: "lokaler", label: "Lokaler" },
{ value: "jobb", label: "Jobb" },
{ value: "saker-ting", label: "Saker & ting" },
{ value: "evenemang", label: "Evenemang" }
];
const MyForm = props => {
const {
values,
handleChange,
handleBlur,
handleSubmit,
setFieldValue
} = props;
return (
<form onSubmit={handleSubmit}>
<label htmlFor="myText" style={{ display: "block" }}>
My Text Field
</label>
<input
id="myText"
placeholder="Enter some text"
value={values.myText}
onChange={handleChange}
onBlur={handleBlur}
/>
<MySelect value={values.option} onChange={setFieldValue} />
<button type="submit">Submit</button>
</form>
);
};
class MySelect extends React.Component {
handleChange = value => {
// this is going to call setFieldValue and manually update values.topcis
this.props.onChange("option", value);
};
render() {
return (
<div style={{ margin: "1rem 0" }}>
<label htmlFor="color">Select an Option </label>
<Select
id="color"
options={options}
onChange={this.handleChange}
value={this.props.value}
/>
</div>
);
}
}
const MyEnhancedForm = withFormik({
mapPropsToValues: props => ({
myText: "",
option: {}
}),
handleSubmit: (values, { setSubmitting }) => {
console.log(values);
}
})(MyForm);
const App = () => <MyEnhancedForm />;
render(<App />, document.getElementById("root"));
There are a few gotchas, you have to include the react select css for the component to display properly
import "react-select/dist/react-select.css";
the function mapPropsToValues option field should be initialised to an object
mapPropsToValues: props => ({
myText: "",
option: {}
Finally here is a link to the codesandbox example
来源:https://stackoverflow.com/questions/50343914/how-to-receive-select-value-in-handlesubmit-function-with-formik-react-js