* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
200 lines
4.4 KiB
Markdown
200 lines
4.4 KiB
Markdown
---
|
||
id: 587d7fae367417b2b2512be5
|
||
title: 将 JSON 数据转换为 HTML
|
||
challengeType: 6
|
||
forumTopicId: 16807
|
||
dashedName: convert-json-data-to-html
|
||
---
|
||
|
||
# --description--
|
||
|
||
现在你从 JSON API 获取了数据,可以在 HTML 中显示它们了。
|
||
|
||
既然 cat photo 对象都保存在数组里,你可以使用 `forEach` 方法来遍历它们。当你拿到每个对象时,你就可以修改 HTML 元素了。
|
||
|
||
首先,通过 `let html = "";` 声明一个 html 变量。
|
||
|
||
接着,遍历 JSON,将用 `strong` 标签包裹的键名和后面跟着值的 html 元素添加给变量。当循环结束后渲染它。
|
||
|
||
这是执行此操作的代码:
|
||
|
||
```js
|
||
let html = "";
|
||
json.forEach(function(val) {
|
||
const keys = Object.keys(val);
|
||
html += "<div class = 'cat'>";
|
||
keys.forEach(function(key) {
|
||
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
|
||
});
|
||
html += "</div><br>";
|
||
});
|
||
```
|
||
|
||
**注意:** 在本挑战中,你需要给页面添加新的 HTML 元素,不能依赖 `textContent` 方法,这个方法容易遭受跨站脚本攻击,可以用 `innerHTML` 来完成挑战。
|
||
|
||
# --instructions--
|
||
|
||
添加一个 `forEach` 循环来遍历 JSON 数据,并创建 HTML 元素以显示它。
|
||
|
||
以下是一个 JSON 示例:
|
||
|
||
```json
|
||
[
|
||
{
|
||
"id":0,
|
||
"imageLink":"https://s3.amazonaws.com/freecodecamp/funny-cat.jpg",
|
||
"altText":"A white cat wearing a green helmet shaped melon on its head. ",
|
||
"codeNames":[ "Juggernaut", "Mrs. Wallace", "Buttercup"
|
||
]
|
||
}
|
||
]
|
||
```
|
||
|
||
# --hints--
|
||
|
||
你的代码应该将数据保存在 `html` 变量中。
|
||
|
||
```js
|
||
assert(code.match(/html\s+?(\+=|=\shtml\s\+)/g));
|
||
```
|
||
|
||
你的代码应该使用 `forEach` 方法来遍历 API 中的 JSON 数据。
|
||
|
||
```js
|
||
assert(code.match(/json\.forEach/g));
|
||
```
|
||
|
||
你的代码应该用 `strong` 标签包裹键名。
|
||
|
||
```js
|
||
assert(code.match(/<strong>.+<\/strong>/g));
|
||
```
|
||
|
||
# --seed--
|
||
|
||
## --seed-contents--
|
||
|
||
```html
|
||
<script>
|
||
document.addEventListener('DOMContentLoaded', function(){
|
||
document.getElementById('getMessage').onclick = function(){
|
||
const req = new XMLHttpRequest();
|
||
req.open("GET",'/json/cats.json',true);
|
||
req.send();
|
||
req.onload = function(){
|
||
const json = JSON.parse(req.responseText);
|
||
let html = "";
|
||
// Add your code below this line
|
||
|
||
|
||
// Add your code above this line
|
||
document.getElementsByClassName('message')[0].innerHTML = html;
|
||
};
|
||
};
|
||
});
|
||
</script>
|
||
|
||
<style>
|
||
body {
|
||
text-align: center;
|
||
font-family: "Helvetica", sans-serif;
|
||
}
|
||
h1 {
|
||
font-size: 2em;
|
||
font-weight: bold;
|
||
}
|
||
.box {
|
||
border-radius: 5px;
|
||
background-color: #eee;
|
||
padding: 20px 5px;
|
||
}
|
||
button {
|
||
color: white;
|
||
background-color: #4791d0;
|
||
border-radius: 5px;
|
||
border: 1px solid #4791d0;
|
||
padding: 5px 10px 8px 10px;
|
||
}
|
||
button:hover {
|
||
background-color: #0F5897;
|
||
border: 1px solid #0F5897;
|
||
}
|
||
</style>
|
||
|
||
<h1>Cat Photo Finder</h1>
|
||
<p class="message box">
|
||
The message will go here
|
||
</p>
|
||
<p>
|
||
<button id="getMessage">
|
||
Get Message
|
||
</button>
|
||
</p>
|
||
```
|
||
|
||
# --solutions--
|
||
|
||
```html
|
||
<script>
|
||
document.addEventListener('DOMContentLoaded', function(){
|
||
document.getElementById('getMessage').onclick = function(){
|
||
const req = new XMLHttpRequest();
|
||
req.open("GET",'/json/cats.json',true);
|
||
req.send();
|
||
req.onload = function(){
|
||
const json = JSON.parse(req.responseText);
|
||
let html = "";
|
||
// Add your code below this line
|
||
json.forEach(function(val) {
|
||
var keys = Object.keys(val);
|
||
html += "<div class = 'cat'>";
|
||
keys.forEach(function(key) {
|
||
html += "<strong>" + key + "</strong>: " + val[key] + "<br>";
|
||
});
|
||
html += "</div><br>";
|
||
});
|
||
// Add your code above this line
|
||
document.getElementsByClassName('message')[0].innerHTML = html;
|
||
};
|
||
};
|
||
});
|
||
</script>
|
||
|
||
<style>
|
||
body {
|
||
text-align: center;
|
||
font-family: "Helvetica", sans-serif;
|
||
}
|
||
h1 {
|
||
font-size: 2em;
|
||
font-weight: bold;
|
||
}
|
||
.box {
|
||
border-radius: 5px;
|
||
background-color: #eee;
|
||
padding: 20px 5px;
|
||
}
|
||
button {
|
||
color: white;
|
||
background-color: #4791d0;
|
||
border-radius: 5px;
|
||
border: 1px solid #4791d0;
|
||
padding: 5px 10px 8px 10px;
|
||
}
|
||
button:hover {
|
||
background-color: #0F5897;
|
||
border: 1px solid #0F5897;
|
||
}
|
||
</style>
|
||
|
||
<h1>Cat Photo Finder</h1>
|
||
<p class="message">
|
||
The message will go here
|
||
</p>
|
||
<p>
|
||
<button id="getMessage">
|
||
Get Message
|
||
</button>
|
||
</p>
|
||
```
|