Node.js & JQuery: “ReferenceError: $ is not defined” error. How do I use jquery with node on the server?

Question

Help! I\'m trying to use jquery in my node.js app, but I keep getting an error when I try to use \'$\', saying \"$ is not defined\"... but I defined it at the top! Here\'s what

Answer 1

Your doSomething function is declared outside if the bounds of the jsdom.env function. $ is only accessible inside that callback. Something like this should work:

var $;

require("jsdom").env("", function(err, window) {
    if (err) {
        console.error(err);
        return;
    }
    $ = require("jquery")(window);
    doSomething();
});

 function doSomething(){
    var deferred = $.Deferred();
}

Though I think it would be more idiomatic to just declare doSomething inside the callback. That way it would have access to jquery from the outer scope.

require("jsdom").env("", function(err, window) {
    if (err) {
        console.error(err);
        return;
    }

    function doSomething(){
        var deferred = $.Deferred();
     }
    var $ = require("jquery")(window);
    doSomething();
});