[英]Javascript 'click' button only works once than have to refresh page
所以我在這個交互式網格上工作並設置它,所以當我單擊一個按鈕時,網格 div 會根據選擇的按鈕更改背景顏色。 我的問題是我只能單擊每個按鈕一次,然后在刷新頁面之前它無法工作。 我該如何解決這個問題,以便可以根據需要多次更改顏色?
HTML
<!DOCTYPE html>
<html>
<head>
<title> Claudias Etch-A-Sketch</title>
<link rel= "stylesheet" href="style.css">
</head>
<body>
<section class="back">
<h1><center> Claudia Etch-A-Sketch!</center></h1>
</section>
<section>
<div>
<button class="Black">Black</button>
<button class="Random">Random Color</button>
<button class="Clear">Clear Board</button>
</div>
</section>
<section>
<div id = "container"> </div>
</section>
</body>
<script src ="javascript.js"> </script>
</html>
爪哇腳本
const container = document.getElementById("container");
const btn= document.querySelector('button');
let y = document.querySelectorAll('button');
y.forEach(button => {
button.addEventListener('click', () => {
let choice = button.innerHTML;
switch (choice) {
case "Random Color":
random();
break;
case "Black":
blackchange();
break;
case "Clear Board":
reset();
break;
}
});
})
function blackchange() { const bb = container.addEventListener('mouseover', e=> e.target.classList.add('black'))};
function random() {
const rr= container.addEventListener('mouseover', e=> e.target.classList.add('random'))
};
function reset () { const rr= container.addEventListener('mouseover', e => e.target.classList.add('reset'))};
function makeRows(rows, cols) {
container.style.setProperty('--grid-rows', rows);
container.style.setProperty('--grid-cols', cols);
for (c = 0; c < (rows * cols); c++) {
let cell = document.createElement("div")
container.appendChild(cell).className = "griditem"
};
};
makeRows(16, 16);
您的主要問題是您不斷在容器上添加mouseover
事件偵聽器,並且您的單元格最終同時具有random
和black
類。 然后,嘗試添加一個或另一個不會改變任何內容。 您需要刪除其他顏色的類並僅應用您想要的類。
您還可以通過只添加一次mouseover
事件偵聽器並使用此事件處理程序將使用的顏色變量來使您的生活更輕松。
試試下面的演示:
const container = document.getElementById("container"); const buttons = document.querySelectorAll('button'); let cells = []; let selectedColor = null; buttons.forEach(button => { button.addEventListener('click', () => { switch (button.id) { case "black-btn": selectColor('black'); break; case "random-btn": selectColor('random'); break; case "clear-btn": reset(); break; } }); }) container.addEventListener('mouseover', e => { if (selectedColor !== null) { e.target.classList.remove('black', 'random'); e.target.classList.add(selectedColor); } }); function reset() { cells.forEach(cell => cell.classList.remove('black', 'random')); } function selectColor(color) { selectedColor = color; buttons.forEach(button => { button.classList[button.id === `${color}-btn` ? 'add' : 'remove']('active'); }); } function makeRows(rows, cols) { container.style.setProperty('--grid-rows', rows); container.style.setProperty('--grid-cols', cols); for (c = 0; c < (rows * cols); c++) { let cell = document.createElement("div"); cells.push(cell); container.appendChild(cell).className = "griditem"; }; }; makeRows(16, 16);
body { font-family: Arial, Helvetica, sans-serif; } h1 { font-size: 16px; } button.active { box-shadow: 0 0 3px #882ac6; } #container { background: #eee; display: grid; height: 150px; width: 150px; grid-template-columns: repeat(16, 1fr); } .griditem.black { background: black; } .griditem.random { -webkit-animation: random 3s infinite; animation: random 3s infinite; } @keyframes random { 0% { background-color: purple; } 15% { background-color: red; } 30% { background-color: yellow; } 45% { background-color: green; } 60% { background-color: blue; } 75% { background-color: orange; } 100% { background-color: purple; } }
<h1>Claudia Etch-A-Sketch!</h1> <div> <button id="black-btn">Black</button> <button id="random-btn">Random Color</button> <button id="clear-btn">Clear Board</button> </div> <div id="container"></div>
你忘記了你對頁面所做的一切都必須清理干凈,否則你所做的事情的影響仍然存在。
設置新的mouseover
功能時,需要先使用removeEventListener
刪除舊的mouseover
功能。 在添加新類之前,您還需要通過鼠標懸停來刪除用戶過去可能已添加到元素的其他類。
試試這個:
const container = document.getElementById("container"); const btn = document.querySelector('button'); let y = document.querySelectorAll('button'); y.forEach(button => { button.addEventListener('click', () => { let choice = button.innerHTML; switch (choice) { case "Random Color": random(); break; case "Black": blackchange(); break; case "Eraser": reset(); break; } }); }); var currentMouseoverFunction = function() {}; function blackchange() { container.removeEventListener('mouseover', currentMouseoverFunction); currentMouseoverFunction = function(e) { e.target.classList.remove('random'); e.target.classList.remove('reset'); e.target.classList.add('black'); }; container.addEventListener('mouseover', currentMouseoverFunction); }; function random() { container.removeEventListener('mouseover', currentMouseoverFunction); currentMouseoverFunction = function(e) { e.target.classList.remove('black'); e.target.classList.remove('reset'); e.target.classList.add('random'); }; container.addEventListener('mouseover', currentMouseoverFunction); }; function reset() { container.removeEventListener('mouseover', currentMouseoverFunction); currentMouseoverFunction = function(e) { e.target.classList.remove('black'); e.target.classList.remove('random'); e.target.classList.add('reset'); }; container.addEventListener('mouseover', currentMouseoverFunction); }; function makeRows(rows, cols) { container.style.setProperty('--grid-rows', rows); container.style.setProperty('--grid-cols', cols); for (c = 0; c < (rows * cols); c++) { let cell = document.createElement("div"); container.appendChild(cell).className = "griditem"; }; }; makeRows(16, 16);
#container{ width:160px; height:160px; margin-top:10px; background:#eee; } #container div { float:left; height: 10px; width: 10px; } .black { background: black; } .random { background: pink; } .reset { background: transparent; }
<section class="back"> <h1> <center> Claudia Etch-A-Sketch!</center> </h1> </section> <section> <div> <button class="Black">Black</button> <button class="Random">Random Color</button> <button class="Clear">Eraser</button> </div> </section> <section> <div id="container"> </div> </section>
我添加了自己的簡單 CSS 用於測試目的,因為我無法訪問您的 CSS。
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