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JavaScript Library Experience: FullCalendar | Wendy's Corner

JavaScript Library Experience: FullCalendar

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First Impression and Basic Usage

I got a request in my work, asking me to research a open source JavaScript calendar library. The calendar should be able to do following:

Add/Load/Delete Events, which needs a commucation with back-end. Event content can be configured, which means developer can over write event trigger function. Also developer can set up event time plot.

Different views, as least have day,week,month view. Also user should have a way to view details in other years.

So I check FullCalendar and the demo looks ok for me. I decide to try it. Official website gave a simple piece of code for basic usage:

<link rel='stylesheet' href='fullcalendar/fullcalendar.css' />
<script src='lib/jquery.min.js'></script>
<script src='lib/moment.min.js'></script>
<script src='fullcalendar/fullcalendar.js'></script>
$(document).ready(function() {

It looks simple, but I encourted following problems and it takes a while to figure out solution:

Problem 1

The confusion of CDNJS source

FullCalendar official website gives out CDN host source for css file and javascript file, which is the way I preferred, comparing to use local file. However, only three files are given with CDN url, which misleading me to thought I only need these three files to run FullCalendar, which is wrong.

After I run code in browser, I got error message in console, telling that moment is not defined as function. This error remind me that I need other JavaScript file to provide basic functionality.

Answer 1

Make sure you have fullcalendar.css, jquery.js, moment.js, fullcalendar.js for basic setup.** moment.js needs to be put before fullcalendar.js.

Problem 2

CSS Style Problem (Cause my headache :)

After I solve the problem above, I was able to see calendar data in browser, but no style has been applied. To solve the problem, I first try following solution:

User console to compare my code and demo code. It turns out that we had same code/classes. The only problem is my classes in code didn't have style applied on.

Change browser. This is not a browser problem.

Re-check code to make sure if I miss any necessary stylesheet.No

First check if all CDN resources loading successfully. Then replace all CDN resource to local resource, and make sure all resources are in same version. Not Work

Use a old stable version for FullCalender. Not Work

Back to demo code and demo source code, make sure we have same JavaScript setting. No difference between two codes.

  • So I have to seek help on Google. A post in StackOverflow helps with this problem.


Load Stylesheet in JavaScript

I should adjust code as following:

$(document).on("ready", function() {
    //This is the code to load stylesheet
    $("<link rel='stylesheet' type='text/css' href='fullcalendar.css' />").appendTo("head");
    $(window).on("load", function() {

It turns out that different from normal file loading process in front-end development, I need to load source javascript file first, then after DOM is ready, loading stylesheet.

In this case, when DOM is ready, stylesheet is appending. The after DOM finish loading style sheet and begin to load window, my javascript code trigger.

Important Notes - $(document).ready triggers after HTML elements has been loaded. - onload event occurs later, after all content elements, such as image, has been loaded. - Next time I get this probelm, I should try to load stylesheet later, using "<link/>".appendTo("head").

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