/
decision-tree-container.js
113 lines (101 loc) · 3.59 KB
/
decision-tree-container.js
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import React, { useState, useEffect, useRef } from 'react';
import PropTypes from 'prop-types'
import { useDebouncedCallback } from 'use-debounce';
import smoothscroll from 'smoothscroll-polyfill';
import Layer from './layer/layer';
const PPLDecisionTree = (props) => {
const [selectedAnswers, setSelectedAnswers] = useState([{ "answer": props.data, layerCount: 0 }]);
const [layerCount, setLayerCount] = useState(1);
const resultRef = useRef(null);
const PPLlayerRef = useRef(null);
const [showResults, setShowResults] = useState(false);
const [delayShowResults] = useDebouncedCallback(
() => {
setShowResults(true);
},
600
);
const handleClick = (answer, layerLevel) => {
setLayerCount(layerCount + 1);
let newSelectedAnswers = selectedAnswers;
if (selectedAnswers.length >= (layerLevel + 1)) {
// if this is selecting an answer at an earlier level than what we've already selected
// cut out the later level answers and results
newSelectedAnswers = selectedAnswers.slice(0, layerLevel);
setShowResults(false);
}
setSelectedAnswers([...newSelectedAnswers, { answer, layerCount }]);
};
const results = selectedAnswers.filter((selectedAnswer) => (selectedAnswer.answer.result))
.map((a) => a.answer.result);
if (selectedAnswers.length >= 1 && results.length >= 1) {
// for screen reader accessibility. Bug in one of the major screen reader providers that reads the result before the rest of the layer options
delayShowResults();
}
const scrollToSection = () => {
let whichToScroll = null;
smoothscroll.polyfill();
if (showResults) {
whichToScroll = resultRef;
} else if (selectedAnswers.length >= 1) {
whichToScroll = PPLlayerRef;
}
if (whichToScroll !== null && whichToScroll.current !== null) {
whichToScroll.current.scrollIntoView({ behavior: 'smooth', block: 'start' });
}
};
useEffect(scrollToSection, [selectedAnswers, showResults]);
return (
<div>
{
selectedAnswers.map((selectedAnswer, index) => {
const isLastItem = index + 1 === selectedAnswers.length;
return selectedAnswer.answer.subquestion &&
(
<div className="dt-section-outer" key={selectedAnswer.layerCount}>
<form>
<div className="dt-section-inner" ref={isLastItem ? PPLlayerRef : null}>
<Layer
question={selectedAnswer.answer.subquestion.question}
answers={selectedAnswer.answer.subquestion.answers}
index={index + 1}
layerCount={selectedAnswer.layerCount}
onClick={handleClick}
moreInfo={selectedAnswer.answer.subquestion.moreInfo}
heading={selectedAnswer.answer.subquestion.heading}
/>
</div>
</form>
</div>
);
})
}
<section aria-live="polite" aria-atomic="true">
{
showResults && results.length > 0 && (
<div ref={resultRef} data-test="results">
<h2>{props.resultsHeader}</h2>
{
results.map((result, index) => (
<div key={index}>
<div>
<p dangerouslySetInnerHTML={{ __html: result.text }} />
</div>
</div>
))
}
</div>
)
}
</section>
</div>
)
}
PPLDecisionTree.propTypes = {
data: PropTypes.shape({
question: PropTypes.string,
answers: PropTypes.array
}).isRequired,
resultsHeader: PropTypes.string
}
export default PPLDecisionTree