In my React project, I need to add rows dynamically.
I code I use to do it as follows
let Para=GetPara();
React.createElement("p", { style: { color: "black" } }, Para[0]),
React.createElement("p", { style: { color: "black" } }, Para[1])
In the above code Para is populated by a ajax function which returns an array I would like to do it dynamically like
function GetPara() {
return (
for (let index = 0; index < Para.length; index++) {
React.createElement("p", {style: {color: "black"}}, Para[i])
}
}
But In the above function I can't seem to return a react element. I also tried
function GetPara() {
let teststr = "";
for (let index = 0; index < Para.length; index++) {
teststr += React.createElement("p", , Para[i]);
}
return (teststr);
}
If I use the above method the value is returned is string and appears as
"<p>test1</p><p>test2</p>"
Based on the answer I changed the code below but i still don't get the values
and get the following error Uncaught (in promise) TypeError: B.setState is not a function
const Questions = (props) => {
let Qvalues = [];
GetData().then((response => {
if (response) {
QuestionValues = response;
if (QuestionValues && QuestionValues.length > 0) {
console.log(QuestionValues.length);
for (let index = 0; index < QuestionValues.length; index++) {
let Qoptions = QuestionValues[index]["Options"].split(',').map(function (val)
{ return { key: val, text: val };
}
);
Qvalues.push(<div className={styles.FormRow}>
<p>Qoptions[0] </p>
<p>Qoptions[1] </p>
</div>);
};
};
};
this.setState({QuestionValues:Qvalues}); console.log(Qvalues);
})).then(res => {
return (
<div >
{ this.state.QuestionValues&& Qvalues}
</div>
)
});
return (
<div >
{Qvalues}
</div>
)
public render(): React.ReactElement<IEProps> {
return
<div>
<div className={styles.container}>
<Header></Header>
<Questions></Questions>
<Footer></Footer>
</div>
</div>
}
Finally i mananged to fix the issue with valuable answers from Zayco and gopigorantala.
My solution is as follows
public componentDidMount() {
let Qvalues = [];
GetData().then((response => {
if (response) {
QuestionValues = response;
if (QuestionValues && QuestionValues.length > 0) {
console.log(QuestionValues.length);
for (let index = 0; index < QuestionValues.length; index++) {
let Qoptions = QuestionValues[index]["Options"].split(',').map(function (val) { return { key: val, text: val }; });
Qvalues.push(<div className={styles.FormRow}>
<p>Qoptions[0] </p>
<p>Qoptions[1] </p>
</div>);
};
};
this.setState({ QuestionValues: Qvalues });
};
}))
}
public render(): React.ReactElement < IEProps > {
const Questions = (props) => {
return (
<div>
{this.state.QuestionValues}
</div>)
}
return
<div>
< div className = { styles.container } >
<Header></Header>
<Questions></Questions>
<Footer></Footer>
</div >
</div >
}
Provided that your api call returns an array of strings this should work.
import React, { Component } from 'react';
import { View, Text } from 'react-native';
class Questions extends Component {
state = {
questionValues: null,
};
componentDidMount() {
GetData().then(response => {
if (response) {
if (response.length > 0) {
this.setState({
questionValues: response,
});
}
}
});
}
renderQuestions = () => this.state.questionValues.map(q => <Text key={q}>{q}</Text>);
render() {
if (!this.state.questionValues) return <Text>Here you can return a custom loading component</Text>;
return <View>{this.renderQuestions()}</View>;
}
}
export default Questions;