[英]The items in the DOM are added multiple times
我遇到了一個問題,每次添加元素時,它都會自我倍增(例如,如果購物車中有 1 個元素,下次單擊時它將再添加 2 個,如果有 3 個元素,它將再添加 3 個,如果 6,它會增加 4),這是一個大問題,請幫忙!
我的js代碼:
let pList = document.getElementById("productList");
const addDrip = () => {
let Drip, localObj, tObj;
Drip = {
name: "Traditional Drip",
type: "normal",
price: "2.00",
imgSrc: "images/c5.png"
};
localObj = localStorage.getItem("Drip");
if(!localObj) tObj = [];
else tObj = JSON.parse(localObj);
tObj.push(Drip)
localStorage.setItem("Drip", JSON.stringify(tObj));
for(let i = 0;i < tObj.length;i++){
let htmlDrip = `
<div class="productDiv">
<p>${tObj[i].name}</p>
<p>${tObj[i].type}</p>
<p>${tObj[i].price}$</p>
<img src="${tObj[i].imgSrc}">
</div>
`
document.getElementById("productList").innerHTML += htmlDrip;
}
}
我的 html 部分:
<div class="cList">
<img src="images/c5.png"class = "tDrip">
<h1 class="Type">Traditional Drip</h1>
<button id="tAdd"onclick="addDrip()">Add Traditional Drip</button>
</div>
<div id = productList></div>
在添加新項目時,您實際上並不需要遍歷數組。 您可以先從localStorage
獲取項目
HTML:
<div class="cList">
<img src="images/c5.png" class="tDrip">
<h1 class="Type">Traditional Drip</h1>
<button id="tAdd" onclick="addDrip()">Add Traditional Drip</button>
</div>
<div id="productList"></div>
腳本:
const pList = document.getElementById("productList");
let localObj = JSON.parse(localStorage.getItem("Drip"));
const parseItems = () => {
if (!localObj) localObj = [];
for (let i = 0; i < localObj.length; i++) {
let htmlDrip = `
<div class="productDiv">
<p>${localObj[i].name}</p>
<p>${localObj[i].type}</p>
<p>${localObj[i].price}$</p>
<img src="${localObj[i].imgSrc}">
</div>
`;
pList.innerHTML += htmlDrip;
}
}
parseItems();
const addDrip = () => {
let Drip;
Drip = {
name: "Traditional Drip",
type: "normal",
price: "2.00",
imgSrc: "images/c5.png"
};
if (!localObj) localObj = [];
localObj.push(Drip);
localStorage.setItem("Drip", JSON.stringify(localObj));
let htmlDrip = `
<div class="productDiv">
<p>${Drip.name}</p>
<p>${Drip.type}</p>
<p>${Drip.price}$</p>
<img src="${Drip.imgSrc}">
</div>
`;
pList.innerHTML += htmlDrip;
}
這是因為您的陣列已經從 localstorage 獲得了滴水更新,只需用它替換您的 JS 代碼,它就會以您想要的方式工作。
let pList = document.getElementById("productList");
const addDrip = () => {
let Drip, localObj, tObj;
Drip = {
name: "Traditional Drip",
type: "normal",
price: "2.00",
imgSrc: "images/c5.png"
};
localObj = localStorage.getItem("Drip");
console.log(localObj,"Local object")
if(!localObj) {
tObj = [];
tObj.push(Drip)
}else {
tObj = JSON.parse(localObj);
console.log(tObj,"T object")
}
localStorage.setItem("Drip", JSON.stringify(tObj));
for(let i = 0;i < tObj.length;i++){
let htmlDrip = `
<div class="productDiv">
<p>${tObj[i].name}</p>
<p>${tObj[i].type}</p>
<p>${tObj[i].price}$</p>
<img src="${tObj[i].imgSrc}">
</div>
`
document.getElementById("productList").innerHTML += htmlDrip;
}
}
你只需要在你的數組為空時推送。 試一試它會起作用的。
注意:您也可以查看演示。 刷新就清除localstorage。 https://www.w3schools.com/code/tryit.asp?filename=GS7FA0970MF3
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