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To help keep ourselves in check, he’s made his JSLint tool available years ago, but I always found myself too lazy to copy/paste my script into the tool to verify it. I finally decided to make this an almost instantaneous process.
Mr. Crockford does have a simple, cscript-compatible version of his script on his web site. It’s too simple, though. Most of the options it can check are disabled so aren’t checked and it stops after finding its first error.
For that reason, I’ve put together my own “host” for JSLint. It supports the enabling and disabling of all the options listed on the JSLint documentation page with command-line parameters and includes reasonable defaults so that you shouldn’t need to set or unset too many.
I’ve also added an option that adds the global variables defined in the Microsoft AJAX Library so that you don’t have to declare them in each of your scripts or on the command line. I’ve turned that option on by default, but it shouldn’t hurt you if you’re not using ASP.NET AJAX.
It also outputs any errors it finds in a format compatible with Visual Studio. If you set it up as an external tool, you can run it against your current file and hit
F8 (the key bound to
To use it, all you have to do is download the latest version of fulljslint.js from the JSLint web site. Put it in some folder in your PATH. For example, I use a folder called
C:\Tools to hold the various little tools I find myself needing frequently. Next, download jslint.wsf from this web site and put it in the same folder you put
Of course, to get the most out of using this, you’re going to want to set it up as an external tool in Visual Studio. Open up Visual Studio, go to Tools -> External Tools… and click Add. Enter “&JSLint” as the Title and “C:\Tools\jslint.cmd” (modified to use the folder you actually saved the files in, of course) as the Command. Enter “$(ItemPath)” as the Arguments. Check Use Output Window and click OK.
To test it out, open up any
.js file and hit
Alt+T and then J (or use the mouse). You should see your Output window appear with the results of the run. If there were any errors just hit
F8 to cycle through them.
If you’re confused about why it’s saying such simple things like
++ are errors, read Douglas’ book or at least read the documentation for JSLint and the other essays on his web site.
A quick tip for ASP.NET AJAX users: If you register your own namespaces using
Type.registerNamespace, you’ll get many errors telling you that your namespace is undefined. Put a comment like this at the top of your file and you’ll be good to go: