[英]Foreach inside a foreach while appending to results div
我有 json 信息(如下所示)。 我可以輕松打印教室名稱和級別。 但我不知道如何循環通過學生將其打印出來。 我不確定如何在 foreach 循環中執行 foreach 循環。 我的 HTML 不是一成不變的,如果需要可以稍微改變一下。
<div id="results">
<div class="classroom">
<div class="cr-name">Name: maths class</div>
<div class="cr-level">Level: 4</div>
<div class="students">
<div class="student">john 19</div>
<div class="student">Mike 34</div>
<div class="student">Billy 19</div>
</div>
</div><br>
<div class="classroom">
<div class="cr-name">Name: English class</div>
<div class="cr-level">Level: 2</div>
<div class="students">
<div class="student">Sam 24</div>
<div class="student">Timmy 32</div>
<div class="student">John 19</div>
<div class="student">Paul 54</div>
</div>
</div>
</div><br>
json 數據如下所示:
[
{
"classroom": "maths class",
"students": [
{
"name": "john",
"age": 20
},
{
"name": "Mike",
"age": 34
},
{
"name": "Billy",
"age": 19
}
],
"level": 4
},
{
"classroom": "English class",
"students": [
{
"name": "Sam",
"age": 24
},
{
"name": "Timmy",
"age": 32
},
{
"name": "John",
"age": 19
},
{
"name": "Paul",
"age": 54
}
],
"level": 2
}
]
我的 HTML:
<div id="results">
</div>
我的 Javascript (其中數據是上面的 json 信息):
if(typeof data !== 'undefined' && data.length > 0) {
data.forEach((myclass, idx) => {
$("#results").append(`
<div class="classroom">
<div class="cr-name">Name: ${data.classroom}</div>
<div class="cr-level">Level: ${data.level}</div>
</div><br>
`);
});
}
將學生數組和.map
每個項目放入 HTML 字符串,例如<div class="student">john 19</div>
,然后將它們連接在一起:
const data = [ { "classroom": "maths class", "students": [ { "name": "john", "age": 20 }, { "name": "Mike", "age": 34 }, { "name": "Billy", "age": 19 } ], "level": 4 }, { "classroom": "English class", "students": [ { "name": "Sam", "age": 24 }, { "name": "Timmy", "age": 32 }, { "name": "John", "age": 19 }, { "name": "Paul", "age": 54 } ], "level": 2 } ] data.forEach(({ classroom, level, students }) => { $("#results").append(` <div class="classroom"> <div class="cr-name">Name: ${classroom}</div> <div class="cr-level">Level: ${level}</div> <div class="students"> ${ students.map(({ name, age }) => `<div class="student">${name} ${age}</div>`).join('') } </div> </div><br> `); });
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <div id="results"></div>
那是如果輸入數據是可信的。 如果不可信,直接編寫這樣的 HTML 字符串可能會導致任意代碼執行。 如果這是您需要防止的事情,請確保首先刪除所有<>
括號:
name.replace(/[<>]/g, '')
age.replace(/[<>]/g, '')
希望它會幫助你。
if(typeof data !== 'undefined' && data.length > 0) {
data.forEach((myclass, idx) => {
studentsMath = myclass.students;
studentsMath.forEach((val, id) => {
$("#results").append(`
<div class="classroom">
<div class="cr-name">Name: ${val.name}</div>
<div class="cr-level">Level: ${myclass.level}</div>
</div><br>
`);
})
});
}
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