模板文字 function 中的 If 语句

Question

我浏览了很多关于这个问题的其他帖子，但我似乎找不到适合我特定问题的答案。 基本上我有一个显示卡片的“应用程序”页面。 每张卡片都是一个单独的应用程序。 这些卡是使用 function 中的模板文字从 JavaScript object 生成的。 我有三个独立的对象，一个用于Engineering 、 Office和In House 。

我需要做什么？

现在，当您加载网站时，您只会看到三张代表类别的卡片。 我想根据用户想要的类别从不同的 object 生成项目。 例如：当用户点击Engineering卡上的按钮时，只会生成approved_Engineering_Software object里面的项目。

我遇到的问题是在模板文字函数中使用if statements时遇到问题。 我希望能够做这样的事情：

function categoryTemplate(card) {
 if (`${card.title}` == "Engineering"){
  return `
   <card class="nested">
     <img class="image" src="${card.icon}">
       <div class="text">
         <h3>${card.title}</h3>
         <p>${card.description}</p>
         <button class="request-button" onclick="show_Engineering_items()">Request</button>
      </div>
   </card>
  `;
 }
}

我在这里和这里检查过，但这些链接中给出的答案都没有成功。

如果您需要更多上下文，这是我的代码：

HTML

<!DOCTYPE html>
<html>
<head>
    <title>Software Request</title>
    <link rel="stylesheet" type="text/css" href="stylesheet.css">
</head>

<body class="main-page">
    <div id="category-view"></div>
    <div id="app"></div>
    <script src="script.js"></script>
</body>
</html>

JavaScript

const main_Category_View = [
  {
    title: "Engineering",
    description: "From Autocad to something else that I will write in later, all your Enginerring Software is found here",
    icon: "Assets/docker1.png"
  },
  {
    title: "Office",
    description: "General purpose office applications e.g Microsoft Office, Excel, Powerpoint, Visio etc",
    icon: "Assets/docker1.png"
  },
  {
    title: "In House",
    description: "Apps build by In House specifically for In House",
    icon: "Assets/docker1.png"
  }
];

const approved_Engineering_Software = [
{
  title: "Microsoft Azure",
  description: "Microsoft Azure is a cloud computing service created by Microsoft for building, testing, deploying, and managing\
applications and services through Microsoft-managed data centers.",
  icon: "Assets/azure.png"
},
  {
    title: "Visual Studio Code",
    description: "Visual Studio Code is a source-code editor developed by Microsoft for Windows, Linux and macOS. It includes support \
for debugging, embedded Git control and GitHub, and code refactoring.",
    icon: "Assets/vscode.png"
  },
];

const approved_Office_Software = [
  {
    title: "Microsoft Word",
    description: "Microsoft Word is a word processor developed by Microsoft. It was first released on October 25, 1983 under the name Multi-Tool Word for Xenix systems.",
    icon: "Assets/word.png"
  }
];

//sorts everything perfectly
  var sortByProperty = function (property) {
    return function (x, y) {
        //basically returns nothing if they are equal,
        //or returns the item that is greater than the lesser
        return ((x[property] === y[property]) ? 0 : ((x[property] > y[property]) ? 1 : -1));
    };
  };

  // completes the rest of the structure of the cards
  function softTemplate(item) {
    return `
      <card class="nested">
        <img class="image" src="${item.icon}">
          <div class="text">
            <!--<button class="request-button" onclick="getDescription('${item.description}')">Request</button> -->
            <h3>${item.title}</h3>
            <p>${item.description}</p>
            <button class="request-button" onclick="getDesc()">Request</button>
        </div>
      </card>
    `;
  }

function categoryTemplate(card) {
  return `
    <card class="nested">
      <img class="image" src="${card.icon}">
        <div class="text">
          <!--<button class="request-button" onclick="getDescription('${card.description}')">Request</button> -->
          <h3>${card.title}</h3>
          <p>${card.description}</p>
          <button class="request-button" onclick="show_items()">Request</button>
      </div>
    </card>
  `;
}

document.getElementById("category-view").innerHTML = `
<div class="stack">
  <main class="grid">
    ${main_Category_View.map(categoryTemplate).join("")}
  </main>
</div>
`;

let sorted_Office_List = approved_Office_Software.sort(sortByProperty('title'));
let sorted_Engineering_List = approved_Engineering_Software.sort(sortByProperty('title'));

// Sets up the structure of the page and sends our Template Literal to two functions for work.
function show_items() {
  document.getElementById("app").innerHTML = `
  <div class="stack">
    <main class="grid">
      ${sorted_Office_List.map(getDesc).join("")}
      ${sorted_Office_List.map(softTemplate).join("")}
    </main>
  </div>
  `;
}

function show_Engineering_items() {
  document.getElementById("app").innerHTML = `
  <div class="stack">
    <main class="grid">
      ${sorted_Office_List.map(softTemplate).join("")}
    </main>
  </div>
  `;
}

Answer 1

模板文字将被翻译为字符串。 你有：

if (`${card.description} == "Engineering"`)

这将被翻译为：

if('Engineering == "Engineering"')

非空字符串是真实的； 你想要做的可能是：

if (card.description === "Engineering")

模板文字 function 中的 If 语句

问题描述

1 个解决方案

解决方案1
2 已采纳 2019-11-11 19:47:14

模板文字 function 中的 If 语句

问题描述

1 个解决方案

解决方案1 2 已采纳 2019-11-11 19:47:14

解决方案1
2 已采纳 2019-11-11 19:47:14