![](/img/trans.png)
[英]Uncaught (in promise) TypeError: Cannot set property 'innerHTML' of null
[英]Uncaught (in promise) TypeError: Cannot set property 'innerHTML' of null - I can see value in console.log()
該項目的目標是開發一個 Web 應用程序,可用於從https://api.github.com/users獲取用戶並列出他們的詳細信息和 repo 信息。 我的add_user_repos()
函數中的forEach()
有問題。 該功能適用於第一次點擊,但不適用於第二次點擊。 下面是我的網絡應用程序代碼。 我收到一個錯誤:
Uncaught (in promise) TypeError: Cannot set property 'innerHTML' of null'
錯誤可以位於粘貼的末尾,評論旁邊<== ERROR HERE
我使用過console.log(repo.name)
並打印出來。
對問題或我的代碼的任何反饋將不勝感激,提前致謝。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Title</title>
<link rel="stylesheet" href="problem_3.css">
</head>
<body>
<div class="center">
<div class="section">
<form name="search_bar">
<label for="search"></label>
<input id="search" type="text" name="search" placeholder="Username">
<button type="button" onclick="search_user()">Search</button>
</form>
</div>
</div>
<div>
<div class="container">
<h1>User Profile</h1>
<div class="wrapper">
<div id="picture">
<!-- image -->
</div>
<div id="user_info">
<table>
<tr>
<th>Name: </th>
<td id="name"></td>
</tr>
<tr>
<th>Username: </th>
<td id="username"></td>
</tr>
<tr>
<th>Email: </th>
<td id="email"></td>
</tr>
<tr>
<th>Locations: </th>
<td id="location"></td>
</tr>
<tr>
<th>Number of gists: </th>
<td id="gists"></td>
</tr>
</table>
</div>
</div>
</div>
</div>
<div class="container">
<h1>User Repos</h1>
<div class="wrapper">
<div id="user_repos">
<div class="user_repos">
<table id="repo">
<tr>
<th>Name: </th>
<td id="name0"></td>
</tr>
<tr>
<th>Description: </th>
<td id="desc0"></td>
</tr>
<tr>
<th>Name: </th>
<td id="name1"></td>
</tr>
<tr class="row">
<th>Description: </th>
<td id="desc1"></td>
</tr>
<tr>
<th>Name: </th>
<td id="name2"></td>
</tr>
<tr class="row">
<th>Description: </th>
<td id="desc2"></td>
</tr>
<tr>
<th>Name: </th>
<td id="name3"></td>
</tr>
<tr class="row">
<th>Description: </th>
<td id="desc3"></td>
</tr>
<tr>
<th>Name: </th>
<td id="name4"></td>
</tr>
<tr class="row">
<th>Description: </th>
<td id="desc4"></td>
</tr>
</table>
</div>
</div>
</div>
</div>
</body>
<script>
function search_user(){
const url = 'https://api.github.com/users/';
const name = document.forms["search_bar"]["search"].value;
get_user_details(name);
async function get_user_details(input){
const headers = {
//token
}
const resp = await fetch(url + input, {
"method": "GET",
"headers":headers
});
const data = await resp.json();
addData(data);
}
function addData(data) {
const user_name = document.getElementById("name");
const user_username = document.getElementById("username");
const user_email = document.getElementById("email");
const user_location = document.getElementById("location");
const user_picture = document.getElementById("picture");
const user_gists = document.getElementById("gists");
const pic = new Image();
pic.src = data.avatar_url;
user_picture.appendChild(pic);
user_name.innerHTML = data.name;
console.log(data.name);
user_username.innerHTML = data.login;
user_email.innerHTML = data.email;
user_location.innerHTML = data.location;
user_gists.innerHTML = data.public_gists;
get_user_repos(data.login);
async function get_user_repos(username) {
const resp = await fetch(url + username + "/repos");
const repo_data = await resp.json();
add_user_repos(repo_data);
}
function add_user_repos(repos) {
// counter used to find if more than 5 repos are added
let counter = 0;
const repo_div = document.getElementById("user_repos");
repos.forEach((repo) => {
let repo_name = document.getElementById("name" + counter);
let repo_desc = document.getElementById("desc" + counter);
// if more than 5 repo names/desc are added
if (counter > 4) {
const create_repo_name = document.createElement("p");
const create_desc = document.createElement("p");
create_repo_name.innerHTML = "<b>Name: </b>" + repo.name;
create_desc.innerHTML = "<b>Description: </b>" + repo.description;
create_desc.setAttribute("class", "row");
repo_div.appendChild(create_repo_name);
repo_div.appendChild(create_desc);
// add scrolling
document.getElementById("user_repos").style.overflow = "auto";
} else {
repo_name.innerHTML = repo.name; // <== ERROR HERE
repo_desc.innerHTML = repo.description;
repo_name.setAttribute("id", "row" + counter);
repo_desc.setAttribute("id", "desc" + counter);
counter++;
}
})
}
}
}
</script>
</html>
TypeError: Cannot set property 'innerHTML' of null'
該問題與repo_name
變量有關,而不是repo.name
。
document.getElementById("name" + counter);
返回空值
您應該確保"name" + counter
存在於您的 DOM 中。
而不是將節點元素設置為具有“行”+ 計數器的 id
repo_name.setAttribute("id", "row" + counter);
將其設置為具有“名稱”+ 計數器的 ID
repo_name.setAttribute("id", "name" + counter);
因此,在接下來的搜索中,您將再次能夠在 DOM 中找到該元素。
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.