Question

我正在开发一个chrome扩展程序，该扩展程序会将HTML中的标识符提取到var中，并且该var将用于填写表单字段。

我尝试用Js完成此操作。但在控制台中收到以下错误：

“未捕获的TypeError：无法将属性'value'设置为null”

    <input type="text" name="currId" placeholder="Current ID" id="searchInput">

    someId = "some-thing-nice

    <!--somehow, the line below was throwing the error with the /value. reddit,stack overflow, and random googling confirmed that I was calling an ID that did not exist in the html/ But it definetly did exist. -->
    document.getElementById("searchInput").value = someId;
    var webID = (document.getElementById("searchInput").value = someId;
    console.log(someId);

我最终实现了jquery。

//this Id is polled from another piece of code and passed to the var someID
var someId = "some-thing-nice";
//sets the property with the id searchInput to the var above
$("#searchInput").val(someId);
//this code can be commented out. currSomeId was to be used to validate the copy
var currsomeId = $("#searchInput").val(someId);
window.alert($("#searchInput").val());

<!DOCTYPE html>
<html lang="en" dir="ltr">

<head>
  <meta charset="utf-8">
  <!-- Latest compiled and minified CSS -->
  <link rel="stylesheet" href="chrome-extension.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script type="text/javascript" src="chrome-extension.js"></script>
  <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
  <title>Chrome Extension</title>
</head>

<body>
  <div class="container">
    <h1 class="application-heading">someID Extension</h1>
    <hr>
    <p class="program-desc">Some Text</p>
      <!-- this field to be populated -->
    <input type="text" name="currWebID" placeholder="Current someID" id="searchInput">
      <!-- This field to be clicked when the id is populated. -->
    <input type="button" name="submit" id="searchButton" value="Search" role="Search">
  </div>
</body>

</html>

最终比赛将是：

填充searchInput字段
然后单击searchBtn以将其重定向到包含有关someId信息的URL

注意：奇怪的是，当我将Js手动输入到浏览器控制台中并将其输入到StackOverflow Code功能中时，Js可以很好地执行。页面加载时，我只是无法获得运行的代码。

jQuery。在控制台中执行，但与HTML

最终比赛将是：

0 个答案: