错误1找不到符号“ $”

Question

When I use Visual Studio to edit an external Javascript file and use Javascript within the page, it unsurprisingly is unaware of JQuery, because the web page that owns it hasn't loaded the Javascript file.

//test.js:

$(document).ready(function () {
    alert("If you really need a code example");
});

As a result, I get this error:

Error   1   Could not find symbol '$'

Again, this is a design time error, not a runtime error.

Is there a way to make the Visual Studio Editor a little smarter or at least suppress these errors?

Update:

I think it was the Typescript editor that I was in that just complained that there was an error, no error is shown when editing the rresulting javascript file.

Modified Question:

How can I make the TypeScript file editor happy? I think the "editor" may be Web Essentials add in and that there may be a directive to make it ignore the $, perhaps. Or am I thinking of JSLint?

I''m new to all of this...

Answer 1

Try:

jQuery(document).ready(function(){
});

or maybe you are missing the ); after the }

Answer 2

In TypeScript, all variables must be declared.

You can declare it with declare var $; at the beginning of the file.

Or you can use a definition file for jQuery:

1. Download it ;

2. Then, in your .ts file, include the definition file:

   /// <reference path='jquery.d.ts' />

   // here the compiler known jQuery

   $(document).ready(/* ... */);