How to add jQuery in JS file

I have some code specific to sorting tables. Since the code is common in most pages I want to make a JS file which will have the code and all the pages using it can reference it from there.

Problem is: How do I add jQuery, and table sorter plugin into that .js file?

I tried something like this:

document.writeln('<script src="/javascripts/jquery.js" type="text/javascript"></script>');
document.writeln('<script type="text/javascript" src="/javascripts/jquery.tablesorter.js"></script>');

but this seems to not work.

What is the best way to do this?

Solution 1:

var script = document.createElement('script');
script.src = 'https://code.jquery.com/jquery-3.4.1.min.js';
script.type = 'text/javascript';
document.getElementsByTagName('head')[0].appendChild(script);

Solution 2:

If you want to include jQuery code from another JS file, this should do the trick:

I had the following in my HTML file:

<script src="jquery-1.6.1.js"></script>
<script src="my_jquery.js"></script>

I created a separate my_jquery.js file with the following:

$(document).ready(function() {
  $('a').click(function(event) {
    event.preventDefault();
    $(this).hide("slow");
  });
});

Solution 3:

You can use the below code to achieve loading jQuery in your JS file. I have also added a jQuery JSFiddle that is working and it's using a self-invoking function.

// Anonymous "self-invoking" function
(function() {
    var startingTime = new Date().getTime();
    // Load the script
    var script = document.createElement("SCRIPT");
    script.src = 'https://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js';
    script.type = 'text/javascript';
    document.getElementsByTagName("head")[0].appendChild(script);

    // Poll for jQuery to come into existance
    var checkReady = function(callback) {
        if (window.jQuery) {
            callback(jQuery);
        }
        else {
            window.setTimeout(function() { checkReady(callback); }, 20);
        }
    };

    // Start polling...
    checkReady(function($) {
        $(function() {
            var endingTime = new Date().getTime();
            var tookTime = endingTime - startingTime;
            window.alert("jQuery is loaded, after " + tookTime + " milliseconds!");
        });
    });
})();

Other Option : - You can also try Require.JS which is a JS module loader.