错误 TS2304:在 angular 5 组件中找不到 $ [英] error TS2304: cannot find $ in angular 5 component

问题描述

我在角度组件中有一个侧导航栏，它在点击时展开类似于 this.用于创建导航栏的 HTML 片段是:

HTML:

顾名思义(openNav())，以下HTML代码将扩展导航栏:

<img (click)="openNav()" src="/imagepath" id="image">

以下 HTML 代码将关闭导航栏:

<ul class="navbar-nav mr-auto" id="sidenavContent"><li class="nav-item" id="close-btn"><img class="closebtn" (点击)="closeNav()" id="white-cross" src="/assets/imagepath"><li class="nav-item" id="close-btn"><p>第 1 项 </p><li class="nav-item"><p>项目 2 </p>

打字稿:

使用的打字稿是:

openNav(){$("#mySidenav").css("width", "50%");//A线}关闭导航(){$("#mySidenav").css("width", "0%");//B行}

ngOnInit() 函数中不包含上述打字稿代码.

问题说明:

只要我在命令提示符下执行 ng serve，我就会收到以下错误:

<块引用>

错误 TS2304:找不到名称$".

$ 代表打字稿中openNav() 和closeNav() 函数中 内的行(上面打字稿中的A 行和B 行).

我想知道该错误背后的主要原因是什么因为有时我会在执行 ng-serve 时收到错误，有时我不会.

解决方案

我假设 $ 是 jQuery.您必须将 jQuery 添加到您的依赖项并将其导入到您使用它的文件中.我还建议为 jQuery 添加类型定义:npm install @types/jquery --save-dev

如果您以任何其他方式导入 jQuery，则只需添加类型即可.

I have a side-navbar in angular component which expands on click similar to this. The HTML snippet used to create the navbar is :

HTML:

As the name(openNav()) suggests, the following HTML code will expand the navbar:

<div>
    <img (click)="openNav()" src="/imagepath" id="image">
</div>

And the following HTML code will close the navbar:

<div id="mySidenav" class="sidenav">
    <ul class="navbar-nav mr-auto" id="sidenavContent">
        <li class="nav-item" id="close-btn">
            <img class="closebtn" (click)="closeNav()" id="white-cross" src="/assets/imagepath">
        </li>
        <li class="nav-item" id="close-btn">
           <p> Item 1 </p>
        </li>
        <li class="nav-item">
            <p> Item 2 </p>
        </li>

    </ul>
</div>

Typescript:

The typescript used is:

openNav() 
 {
     $("#mySidenav").css("width", "50%");   // Line A
 }

 closeNav() 
 {
    $("#mySidenav").css("width", "0%");   // Line B
 }

The above typescript code is not included in the ngOnInit() function.

Problem Statement :

As soon as I do ng serve on my command prompt, I get the following error:

error TS2304: Cannot find name '$'.

The $ represents the lines (Line A and Line B in the typescript above) inside openNav() and closeNav() functions above in the typescript.

I am wondering what are the primary reasons behind that error as sometimes I get the error and sometimes I don't while doing ng-serve.

解决方案

I assume that $ is jQuery. You must add jQuery to your dependencies and imported it in the file where you're using it. I'd suggest also adding the type definitions for jQuery: npm install @types/jquery --save-dev

If you're importing jQuery in any other way, then just add the types.

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