인프런 커뮤니티 질문&답변
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main.js 적용내용 강좌에서 에러가 나서 문의 드려요~
해결된 질문
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(() => {
let yOffset = 0; //window.pageyOffset
let prevScrollHeight = 0; // 현재 스크롤 위치(yOffset)보다 이전에 위치한 스크롤 섹션들의 스크롤 높이값의 합
let currentScene = 0; // 현재 활성화된(눈 앞에 보고있는) 씬(scroll-section)
let enterNewScene = false; //새로운 scene이 시작된 순간
const sceneInfo = [
{
// 0
type:'sticky',
heightNum:5,//브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight :0,
objs:{
container: document.querySelector('#scroll-section-0'),
messageA: document.querySelector('#scroll-section-0 .main-message.a'),
messageB: document.querySelector('#scroll-section-0 .main-message.b'),
messageC: document.querySelector('#scroll-section-0 .main-message.c'),
messageD: document.querySelector('#scroll-section-0 .main-message.d'),
},
values:{
messageA_opacity_in: [0, 1, { start: 0.1, end: 0.2 }],
messageB_opacity_in: [0, 1, { start: 0.3, end: 0.4 }],
messageC_opacity_in: [0, 1, { start: 0.5, end: 0.6 }],
messageD_opacity_in: [0, 1, { start: 0.7, end: 0.8 }],
messageA_translateY_in: [20, 0, { start: 0.1, end: 0.2 }],
messageB_translateY_in: [20, 0, { start: 0.3, end: 0.4 }],
messageC_translateY_in: [20, 0, { start: 0.5, end: 0.6 }],
messageD_translateY_in: [20, 0, { start: 0.7, end: 0.8 }],
messageA_opacity_out: [1, 0, { start: 0.25, end: 0.3 }],
messageB_opacity_out: [1, 0, { start: 0.45, end: 0.5 }],
messageC_opacity_out: [1, 0, { start: 0.65, end: 0.7 }],
messageD_opacity_out: [1, 0, { start: 0.85, end: 0.9 }],
messageA_translateY_out: [0, -20, { start: 0.25, end: 0.3 }],
messageB_translateY_out: [0, -20, { start: 0.45, end: 0.5 }],
messageC_translateY_out: [0, -20, { start: 0.65, end: 0.7 }],
messageD_translateY_out: [0, -20, { start: 0.85, end: 0.9 }]
}
},
{
// 1
type:'normal',
heightNum:5,//브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight :0,
objs:{
container:document.querySelector('#scroll-section-1')
}
},
{
// 2
type:'sticky',
heightNum:5,//브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight :0,
objs:{
container: document.querySelector('#scroll-section-2'),
messageA: document.querySelector('#scroll-section-2 .a'),
messageB: document.querySelector('#scroll-section-2 .b'),
messageC: document.querySelector('#scroll-section-2 .c'),
pinB: document.querySelector('#scroll-section-2 .b .pin'),
pinC: document.querySelector('#scroll-section-2 .c .pin'),
},
values:{
messageA_translateY_in: [20, 0, { start: 0.15, end: 0.2 }],
messageB_translateY_in: [30, 0, { start: 0.6, end: 0.65 }],
messageC_translateY_in: [30, 0, { start: 0.87, end: 0.92 }],
messageA_opacity_in: [0, 1, { start: 0.25, end: 0.3 }],
messageB_opacity_in: [0, 1, { start: 0.6, end: 0.65 }],
messageC_opacity_in: [0, 1, { start: 0.87, end: 0.92 }],
messageA_translateY_out: [0, -20, { start: 0.4, end: 0.45 }],
messageB_translateY_out: [0, -20, { start: 0.68, end: 0.73 }],
messageC_translateY_out: [0, -20, { start: 0.95, end: 1 }],
messageA_opacity_out: [1, 0, { start: 0.4, end: 0.45 }],
messageB_opacity_out: [1, 0, { start: 0.68, end: 0.73 }],
messageC_opacity_out: [1, 0, { start: 0.95, end: 1 }],
pinB_scaleY: [0.5, 1, { start: 0.6, end: 0.65 }],
pinC_scaleY: [0.5, 1, { start: 0.87, end: 0.92 }]
}
},
{
// 3
type:'sticky',
heightNum:5,//브라우저 높이의 5배로 scrollHeight 세팅
scrollHeight :0,
objs:{
container:document.querySelector('#scroll-section-3'),
canvasCaption:document.querySelector('.canvas-caption')
},
valeus:{
canvasCaption_opacity: [ 0, 1, { start: 0, end: 0 } ],
canvasCaption_translateY: [ 20, 0, { start: 0, end: 0 } ]
}
},
]
function setLayout(){
//각 스크롤 섹션의 높이 세팅
for(let i =0 ; i<sceneInfo.length; i++){
if(sceneInfo[i].type==='sticky'){
sceneInfo[i].scrollHeight = sceneInfo[i].heightNum * window.innerHeight;
}else if(sceneInfo[i].type==='normal'){
sceneInfo[i].scrollHeight = sceneInfo[i].objs.container.offsetHeight;
}
sceneInfo[i].objs.container.style.height =`${sceneInfo[i].scrollHeight}px`;
}
console.log(sceneInfo);
yOffset = window.pageYOffset;
let totalScrollHeight =0;
for(let i =0;i<sceneInfo.length;i++){
totalScrollHeight += sceneInfo[i].scrollHeight;
if(totalScrollHeight >= yOffset){
currentScene =i;
break;
}
}
document.body.setAttribute('id',`show-scene-${currentScene}`);
}
function calcValues(values, currentYOffset){
let rv;
const scrollHeight = sceneInfo[currentScene].scrollHeight;
const scrollRatio = currentYOffset / sceneInfo[currentScene].scrollHeight;
if(values.length===3){
//start
const partScrollStart = values[2].start * scrollHeight;
const partScrollEnd = values[2].end * scrollHeight;
const partScrollHeight = partScrollEnd - partScrollStart;
if(currentYOffset >= partScrollStart && currentYOffset <= partScrollEnd){
rv = (currentYOffset-partScrollStart)/partScrollHeight * (values[1]-values[0])+values[0];
}else if(currentYOffset <partScrollStart){
rv = values[0];
}else if(currentYOffset >partScrollEnd){
rv = values[1];
}
}else{
//end
rv = scrollRatio* (values[1]-values[0])+values[0];
}
return rv;
}
function playAnimation(){
const objs = sceneInfo[currentScene].objs;
const values = sceneInfo[currentScene].values;
const currentYOffset = yOffset - prevScrollHeight;
const scrollHeight = sceneInfo[currentScene].scrollHeight;
const scrollRatio = currentYOffset / scrollHeight;
// console.log(currentScene);
switch (currentScene){
case 0:
if(scrollRatio <= 0.22){
//in
objs.messageA.style.opacity = calcValues(values.messageA_opacity_in,currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_in,currentYOffset)}%, 0)`;
}else{
//out
objs.messageA.style.opacity = calcValues(values.messageA_opacity_out,currentYOffset);
objs.messageA.style.transform = `translate3d(0, ${calcValues(values.messageA_translateY_out,currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.42) {
// in
objs.messageB.style.opacity = calcValues(values.messageB_opacity_in, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageB.style.opacity = calcValues(values.messageB_opacity_out, currentYOffset);
objs.messageB.style.transform = `translate3d(0, ${calcValues(values.messageB_translateY_out, currentYOffset)}%, 0)`;
}
if (scrollRatio <= 0.62) {
// in
objs.messageC.style.opacity = calcValues(values.messageC_opacity_in, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_in, currentYOffset)}%, 0)`;
} else {
// out
objs.messageC.style.opacity = calcValues(values.messageC_opacity_out, currentYOffset);
objs.messageC.style.transform = `translate3d(0, ${calcValues(values.messageC_translateY_out, currentYOffset)}%, 0)`;
}
break;
case 1:
// console.log('1 play');
break;
case 2:
// console.log('2 play');
break;
case 3:
// console.log('3 play');
break;
}
}
function scrollLoop(){
enterNewScene= false;
prevScrollHeight = 0;
for(let i=0;i<currentScene;i++){
prevScrollHeight += sceneInfo[i].scrollHeight;
}
if(yOffset > prevScrollHeight + sceneInfo[currentScene].scrollHeight){
enterNewScene=true;
currentScene++;
document.body.setAttribute('id',`show-scene-${currentScene}`)
}
if(yOffset < prevScrollHeight){
enterNewScene=true;
if(currentScene === 0) return;//브라우저 바운스 효과 방지
currentScene--;
document.body.setAttribute('id',`show-scene-${currentScene}`)
}
if(enterNewScene) return;
playAnimation();
}
window.addEventListener('scroll', () =>{
yOffset=(window.pageYOffset);
scrollLoop();
})
// window.addEventListener('DOMContentLoaded',setLayout);
window.addEventListener('load',setLayout);
window.addEventListener('resize',setLayout);
})()
0.62 scrollRatio 에서 에러가 나서 문의 드려요.
main.js:187 Uncaught TypeError: Cannot read property 'style' of null
