AngularJS --> ng-view 不加载 js
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【中文标题】AngularJS --> ng-view 不加载 js【英文标题】：AngularJS --> ng-view not loading js 【发布时间】：2022-01-24 00:46:59 【问题描述】：当 day1.js 脚本加载到索引中并且如果 html 模板中的某个 sn-p 粘贴到文件中时，该代码有效，但是当我使用 ng-view 切换到页面时它不起作用使用相同的代码。我的 day1 控制器中没有任何内容。在这一点上我很迷茫，希望能得到一些见解。
我不断收到错误
day1.js:5 Uncaught TypeError: Cannot read properties of null (reading 'addEventListener')
这是我的索引：
<!-- Takes in an input.txt and counts how many times the numbers increase and decrease -->
<!DOCTYPE html>
<html ng-app="adventOfCode">
<head>
<title>Home</title>
<link rel="stylesheet" href="style.css" />
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.8/angular.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.7.8/angular-route.min.js"></script>
<meta name="vieport" content="width=device-width initial scale=1" />
</head>
<body>
<header><h2>Website Header</h2></header>
<div class="column">
<div class="links">
<a href="#/home">Home</a><br />
<a href="#/day1">Day 1</a><br />
<a href="#/day2">Day 2</a><br />
</div>
</div>
<!-- Where the pages change -->
<div ng-view></div>
<!-- Code only works as intended when this div is pasted here -->
<div>
<input type="file" />
<textarea name="" id="" cols="30" rows="10"></textarea>
</div>
<!-- End of pasted code -->
<footer><h3>Website footer lalalala</h3></footer>
<script>
var app = angular
.module("adventOfCode", ["ngRoute"])
.config(function ($routeProvider, $locationProvider)
//inject $locationProvider service
$locationProvider.hashPrefix(""); // add configuration
$routeProvider
.when("/home",
template: "About Us",
)
.when("/day1",
templateUrl: "views/day1.html",
controller: "day1Controller",
)
.when("/day2",
templateUrl: "views/day2.html",
controller: "day2Controller",
);
);
</script>
<!-- Controllers -->
<script src="js/controllers/day1Controller.js"></script>
<script src="js/controllers/day2Controller.js"></script>
<!-- My scripts -->
<script src="js/day1.js"></script>
</body>
</html>` 这是我正在尝试运行的 javascript (day1.js)：
//selecting the input and textarea elements and saving them to variables
let input = document.querySelector("input");
let textarea = document.querySelector("textarea");
input.addEventListener("change", () =>
//returns an array of File objects
let files = input.files;
if (files.length == 0) return;
//getting the first File object
const file = files[0];
//creating a FileReader
let reader = new FileReader();
reader.onload = (e) =>
var index = 0;
var lastLine = "";
var currentLine = "";
var increased = 0;
var decreased = 0;
var results = [];
const file = e.target.result;
console.log("inside onload");
/**We are using split() function and passing regex pattern /\r\n|\n/ as a parameter. This will generate an array of lines and we are storing that in the lines variable. */
const lines = file.split(/\r\n|\n/);
console.log("split the lines");
/**-------------- Our Workspace -------------- */
lines.forEach((line) =>
if (index === 0)
lastLine = line;
console.log(line + "-->" + index);
index++;
else
currentLine = line;
if (currentLine > lastLine)
console.log(line + " --> " + index + " :increased");
increased++;
else if (currentLine < lastLine)
console.log(line + " --> " + index + " :decreased");
decreased++;
else
console.log(line + " --> " + index);
index++;
lastLine = currentLine;
);
console.log("Number of inputs: " + index);
console.log("How many times the inputs increased: " + increased); //1582 is too low
console.log("How many times the inputs decreased: " + decreased);
document.getElementById("increase").innerHTML =
"How many times the inputs increased: " + increased;
document.getElementById("decrease").innerHTML =
"How many times the inputs decreased: " + decreased;
results = slidingWindow(lines, 3);
document.getElementById("increase_").innerHTML =
"How many times the inputs increased: " + results[0];
document.getElementById("decrease_").innerHTML =
"How many times the inputs decreased: " + results[1];
document.getElementById("Index").innerHTML = "Number of inputs: " + index;
/**We are using the join() method to join all lines by a newline character (\n). This will return a string and we are setting that string as the value of the textarea element. */
textarea.value = lines.join("\n");
console.log("joined the lines");
;
reader.onerror = (e) => alert(e.target.error.name);
reader.readAsText(file);
);
function slidingWindow(linesArray, windowSize)
if (windowSize < 0 || windowSize > linesArray.length) return null;
let currentSum = 0;
let lastSum = 0;
let increased = 0;
let decreased = 0;
let results = [];
for (let i = 0; i < linesArray.length; i++)
currentSum += parseInt(linesArray[i]);
if (i >= windowSize - 1)
if ((lastSum === 0) && (currentSum > lastSum))
console.log(currentSum + " --> " + i + " :no change");
else if (currentSum > lastSum)
console.log(currentSum + " --> " + i + " :increased");
increased++;
else if (currentSum < lastSum)
console.log(currentSum + " --> " + i + " :decreased");
decreased++;
else if ((currentSum = lastSum))
console.log(currentSum + " --> " + i + " :no change");
lastSum = currentSum;
currentSum -= linesArray[i - (windowSize - 1)];
return (results = [increased, decreased]);
这里是 day1.html，我想用它来运行 day1.js：
<div>
<input type="file">
<textarea name="" id="" cols="30" rows="10"></textarea>
</div>
<div>
<h3>Increase or Decrease</h3>
<h2 id="increase"></h2>
<h2 id="decrease"></h2>
<h3>Sliding window</h3>
<h2 id="increase_"></h2>
<h2 id="decrease_"></h2>
<h3 id="Index"></h3>
</div>【问题讨论】：
在加载该视图之前元素不存在。建议您使用 angularjs 更改事件侦听器并在控制器内运行代码 【参考方案1】：你必须使用容器来放置你的视图。ng-视图是一个像占位符一样工作的指令。它创建一个占位符，可以根据配置放置相应的视图。
<div class="container">
<div class="row">
<div class="col-sm-12">
<div class="nav">
<a href="#home" class="button">Home</a>
<a href="#about" class="button">About</a>
</div>
</div>
</div>
</div>
<div class="container">
<div ng-view=""></div>
</div>
【讨论】：
【参考方案2】：我的问题是我的 index.html 中没有 Jquery 库。没有它，ng-view 加载时不会执行脚本。
【讨论】：
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