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我正在構建一個表單 - 用戶在移動到下一個屏幕之前需要回答的一系列問題(單選按鈕)。對於字段驗證,我使用yup(npm包)和redux作爲狀態管理。反應 - 檢查元素是否在DOM中可見
對於一個特定的場景/組合,新的屏幕(div)顯示要求確認(複選框),然後用戶才能繼續。我只想在顯示時應用此複選框的驗證。
如何檢查元素(div)是否使用React顯示在DOM中?
我認爲這樣做的方式是將varibale'isScreenVisible'設置爲false,如果條件滿足,我會將狀態更改爲'true'。
我正在做檢查並在_renderScreen()中將'isScreenVisible'設置爲true或false,但由於某種原因它會進入無限循環。
我的代碼:
class Component extends React.Component {
constructor(props) {
super(props);
this.state = {
formisValid: true,
errors: {},
isScreenVisible: false
}
this.FormValidator = new Validate();
this.FormValidator.setValidationSchema(this.getValidationSchema());
}
areThereErrors(errors) {
var key, er = false;
for(key in errors) {
if(errors[key]) {er = true}
}
return er;
}
getValidationSchema() {
return yup.object().shape({
TravelInsurance: yup.string().min(1).required("Please select an option"),
MobilePhoneInsurance: yup.string().min(1).required("Please select an option"),
Confirmation: yup.string().min(1).required("Please confirm"),
});
}
//values of form fields
getValidationObject() {
let openConfirmation = (this.props.store.Confirmation === true)? 'confirmed': ''
return {
TravelInsurance: this.props.store.TravelInsurance,
MobilePhoneInsurance: this.props.store.MobilePhoneInsurance,
Confirmation: openConfirmation,
}
}
setSubmitErrors(errors) {
this.setState({errors: errors});
}
submitForm() {
var isErrored, prom, scope = this, obj = this.getValidationObject();
prom = this.FormValidator.validateSubmit(obj);
prom.then((errors) => {
isErrored = this.FormValidator.isFormErrored();
scope.setState({errors: errors},() => {
if (isErrored) {
} else {
this.context.router.push('/Confirm');
}
});
});
}
saveData(e) {
let data = {}
data[e.target.name] = e.target.value
this.props.addData(data)
this.props.addData({
Confirmation: e.target.checked
})
}
_renderScreen =() => {
const {
Confirmation
} = this.props.store
if(typeof(this.props.store.TravelInsurance) !== 'undefined' && typeof(this.props.store.MobilePhoneInsurance) !== 'undefined') &&
((this.props.store.TravelInsurance === 'Yes' && this.props.store.MobilePhoneInsurance === 'No') ||
(this.props.store.TravelInsurance === 'No' && this.props.store.MobilePhoneInsurance === 'Yes')){
this.setState({
isScreenVisible: true
})
return(
<div>
<p>Please confirm that you want to proceed</p>
<CheckboxField
id="Confirmation"
name="Confirmation"
value={Confirmation}
validationMessage={this.state.errors.Confirmation}
label="I confirm that I would like to continue"
defaultChecked={!!Confirmation}
onClick={(e)=> {this.saveData(e)} }
/>
</FormLabel>
</div>
)
}
else{
this.setState({
isScreenVisible: false
})
}
}
render(){
const {
TravelInsurance,
MobilePhoneInsurance
} = this.props.store
return (
<div>
<RadioButtonGroup
id="TravelInsurance"
name="TravelInsurance"
checked={TravelInsurance}
onClick={this.saveData.bind(this)}
options={{
'Yes': 'Yes',
'No': 'No'
}}
validationMessage={(this.state.errors.TravelInsurance) ? this.state.errors.TravelInsurance : null }
/>
<RadioButtonGroup
id="MobilePhoneInsurance"
name="MobilePhoneInsurance"
checked={MobilePhoneInsurance}
onClick={this.saveData.bind(this)}
options={{
'Yes': 'Yes',
'No': 'No'
}}
validationMessage={(this.state.errors.MobilePhoneInsurance) ? this.state.errors.MobilePhoneInsurance : null }
/>
this._renderScreen()
<ButtonRow
primaryProps={{
children: 'Continue',
onClick: e=>{
this.submitForm();
}
}}
</div>
)
}
}
const mapStateToProps = (state) => {
return {
store: state.Insurance,
}
}
const Insurance = connect(mapStateToProps,{addData})(Component)
export default Insurance