在 stackoverflow 上查了几个问题，但无法解决错误。 目的是修改 html 并将其添加到读取 JSON 结构的主文档中。
Uncaught TypeError: Cannot read property 'appendChild' of undefined
更新 1:-
- 拼写错误已更正，并在代码中标记。
- Defer 是在 head 部分的脚本加载时引入的，这可以确保在脚本开始执行之前加载整个文档。
这里我尝试读取 JSON，然后循环遍历其内容以添加到我的主 html 文档中。
var json={
"fruit":[
{
"fruitname":"Apple",
"location":"data/png/apple.png",
"quantity":"25",
"price":"2"
},
{
"fruitname":"Mango",
"location":"data/png/mango.png",
"quantity":"35",
"price":"3"
}
]
};
//var cards = document.getElementsByClassName("content"); -- corrected typo
var cards = document.getElementById("content");
var fruits = json.fruit;
//alert(fruits.length);
//alert(fruits[1].fruitname);
for (var i = 0; i < fruits.length; i++) {
var cardelement=document.createElement('div');
cardelement.className = 'card';
// alert(cardelement);
cards.appendChild(cardelement);
var object = document.createElement('div');
object.className = 'object';
// alert(object);
cardelement.appendChild(object);
var image = document.createElement('img');
image.setAttribute("src", fruits[i].location);
object.appendChild(image);
var objectback = document.createElement('div');
objectback.className = 'object-back';
cardelement.appendChild(objectback);
var backfruit = document.createElement('div');
backfruit.className = 'back-fruit';
backfruit.innerHTML = fruits[i].fruitname;
objectback.appendChild(backfruit);
var backprice = document.createElement('div');
backprice.className = 'back-price';
backprice.innerHTML = fruits[i].price + "$ per unit";
objectback.appendChild(backprice);
var backquantity = document.createElement('div');
backquantity.className = 'back-quantity';
backquantity.innerHTML = "In Stock " + fruits[i].quantity + " units";
objectback.appendChild(backquantity);
}*
{
margin: 0 0;
border: none;
text-align:center
}
#header
{
background-color: #F44336;
font-family: 'Bungee Shade', cursive;
font-size: 30px;
height: 20%
}
#footer
{
font-family: 'Roboto', sans-serif;
position: fixed;
height: 80%;
width: 100%
}
#content
{
width: 75%;
height: 100%;
border-right: thick solid #F44336;
float: left;
text-align: left;
overflow: scroll
}
#cart
{
background-color:#3F51B5;
width: 25%;
border-bottom: thick dashed #F44336;
float: right
}
.card
{
display:inline-block;
width: 100px;
height: 100px;
margin: 40px;
padding: 20px;
box-shadow: -1px 9px 20px 4px #000000;
border: 5px solid #F44336;
border-radius: 26px 26px 26px 26px;
transition: all .2s ease-in-out
}
.object .object-back
{
display:block;
position:static
}
.object-back
{
display: none
}
.object img
{
height: 100px;
width: 100px
}
.back-fruit
{
font-size: 20px;
padding-bottom: 5px;
margin-bottom: 10px;
border-bottom: thin solid
}
.back-price
{
font-size: 12px;
padding-bottom: 5px
}
.back-quantity
{
font-size: 10px;
padding-bottom: 10px
}
.back-pluscart
{
font-size: 15px;
background-color: #F44336;
width: auto
}
.back-pluscart img
{
height: 30px;
width: 30px
}
.card:hover
{
box-shadow: -1px 9px 46px 11px #000000
}
.card:hover .object
{
display: none
}
.card:hover .object-back
{
display:inline-block;
opacity: 1
}<!DOCTYPE html>
<html>
<head>
<title> The Shopkeeper </title>
<link href="https://fonts.googleapis.com/css?family=Bungee+Shade" rel="stylesheet">
<link href="https://fonts.googleapis.com/css?family=Roboto" rel="stylesheet">
<link rel = "stylesheet" type = "text/css" href = "style/style.css" />
<script type="text/javascript" src="logic/core.js" defer></script>
<meta name="viewport" content="width=device-width">
</head>
<body>
<div id="base">
<div id="header">
<h1> Fruitkart </h1>
</div>
<div id="footer">
<div id="content">
<!--
<div class="card">
<div class="object">
<img src="data/png/apple.png" />
</div>
<div class="object-back">
<div class="back-fruit">Apple</div>
<div class="back-price">2$ per unit</div>
<div class="back-quantity">In Stock 25 pieces </div>
<div class="back-pluscart"> <img src="data/png/cart.png" /> </div>
</div>
</div>
-->
</div>
<div id="cart">
django
is a big boy
</div>
</div>
</div>
</body>
</html>最佳答案
为什么内容未定义
您尝试通过 ClassName 获取内容
var cards = document.getElementsByClassName("content")[0];
但是在您的 html 中找到内容:
<div id="content">
请注意，ID 是内容。将其更改为 class="content" 或将之前的代码更改为 document.getElementByID("content");
关于javascript - 我正在尝试使用 Javascript 读取示例 json 动态插入一段 html 代码，但无法这样做，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/41628310/