Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.
COURSE of the MONTH
8 days, 10 hours left to enrollBecome a Premium Member and unlock a new, free course in leading technologies each month.
JavaScript
120K
Solutions
41K
Contributors
JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and in almost every mainstream web browser.
Share tech news, updates, or what's on your mind.
This article discusses how to implement server side field validation and display customized error messages to the client.
Today, the web development industry is booming, and many people consider it to be their vocation. The question you may be asking yourself is – how do I become a web developer?
Active today
Good article.
Angular JS is one of many options for learning javascript display+controller logic. If someone is trying to learn Angular but is struggling to understand then they might want to try another framework like React, Riot, Ember, Polymer, Vue, or Meteor. I had a really hard time following Angular but had a much easier time learning React, Polymer, and Meteor. Learning at least one js framework will give you an idea of how to work with the others and how to structure larger or more complex applications.
Angular JS is one of many options for learning javascript display+controller logic. If someone is trying to learn Angular but is struggling to understand then they might want to try another framework like React, Riot, Ember, Polymer, Vue, or Meteor. I had a really hard time following Angular but had a much easier time learning React, Polymer, and Meteor. Learning at least one js framework will give you an idea of how to work with the others and how to structure larger or more complex applications.
Well bless your cotton socks, Ryan! Thank goodness someone else can do the jobs I can't fathom. I've been writing websites for clients for 11 years and I like to stick to my lane (writing quality copy). The thought of trying to code/design/build a website does my head in. We all have our strengths, don't we? For me, it's words ... not graphics, not design, not accounting. I know from working with you that your level of service is outstanding so there's no question about you being a "successful web developer"! I enjoyed your post (even if it did make my head spin a bit)!
Boost your ability to deliver ambitious and competitive web apps by choosing the right JavaScript framework to best suit your project’s needs.
This article demonstrates how to create a simple responsive confirmation dialog with Ok and Cancel buttons using HTML, CSS, jQuery and Promises
Nothing in an HTTP request can be trusted, including HTTP headers and form data. A form token is a tool that can be used to guard against request forgeries (CSRF). This article shows an improved approach to form tokens, making it more difficult to use "screen scrapers" to attack web forms.
Active today
it's a great article. I wish I had read it earlier.
Thank you very much Ray Paseur
Thank you very much Ray Paseur
International Data Corporation (IDC) prognosticates that before the current the year gets over disbursing on IT framework products to be sent in cloud environs will be $37.1B.
JavaScript can be used in a browser to change parts of a webpage dynamically. It begins with the following pattern: If condition W is true, do thing X to target Y after event Z. Below are some tips and tricks to help you get started with JavaScript and form good habits that can make your life easier in the long run. (Note: examples in this article use jQuery for simplicity.)
Start by writing comments which describe in plain language what you’re trying to do. Outline where you will need variables, functions, and events. You can always add more complexity like loops and data later on. For example after document ready, whenever someone clicks on a specific button, increment a counter on the page.
Half of JavaScript is knowing what you can do, while the other half is knowing when you can do it.
Document ready is not the only trigger. It’s very common to re-run the same function on document.ready, ajaxComplete, and window.resize. Modern JavaScript frameworks may use something like componentReady instead of documentReady. You can also run functions on scroll, click, touch, change, etc.
You will want a technique for running the same function with different options. Parameters facilitate reuse by allowing variables to be passed into a function.
…
Start with Descriptions
Start by writing comments which describe in plain language what you’re trying to do. Outline where you will need variables, functions, and events. You can always add more complexity like loops and data later on. For example after document ready, whenever someone clicks on a specific button, increment a counter on the page.
Learn Events Other than Document Ready
Half of JavaScript is knowing what you can do, while the other half is knowing when you can do it.
Document ready is not the only trigger. It’s very common to re-run the same function on document.ready, ajaxComplete, and window.resize. Modern JavaScript frameworks may use something like componentReady instead of documentReady. You can also run functions on scroll, click, touch, change, etc.
Learn How to Use Parameters
You will want a technique for running the same function with different options. Parameters facilitate reuse by allowing variables to be passed into a function.
Make All Functions Reuseable
…
Technology Partners: We Want Your Opinion!
We value your feedback.
Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!
JavaScript has plenty of pieces of code people often just copy/paste from somewhere but never quite fully understand.
Self-Executing functions are just one good example that I'll try to demystify here.
Self-Executing functions are just one good example that I'll try to demystify here.
Active 1 day ago
It should be noted that these are often called "IIFEs": Immediately Invoked Function Expressions.
Active 2 days ago
HI käµfm³d,
you're right, thanks!
I've added it to the article.
Cheers!
Alex
you're right, thanks!
I've added it to the article.
Cheers!
Alex
You have this traditional web application that refreshes the whole page each time you navigate and you think it's a good time to convert it to a Single-Page approach. What should you know in advance? Read on, I'll guide you through it.
Introduction
JSON is an acronym for JavaScript Object Notation. It is a text-string data transport mechanism, capable of representing simple or complex data structures in a consistent and easy-to-read manner. Similar in concept to XML, but more efficient and more widely supported, JSON has become the dominant technology for use in AJAX applications, APIs, and other data interchange applications where data structure and data elements must be communicated between applications and web services.
JSON is frequently found in combination with RESTful APIs, where XML has rightly fallen into disuse. This article will examine some of the ways XML and JSON are similar and different, and will show ways of using JSON to our advantage.
Some code examples will show how to create and interpret JSON strings, and detect JSON errors.
A Bit of Test Data
Since the most important thing a programmer can have is a good test case, let's start with some good test data. Here is the information we will use for all of our code examples. This information will represent people, giving their names and ZIP codes. While the example is truly minimalist, it's sufficient to illustrate the principles.
A Bit of Test Data Organization
Both XML and JSON can represent the data structure. Here is how our data will be organized.
The Old School Way: XML
XML, or Extensible Markup Language, is a text-string data transport mechanism. It was popularized in the 1990s when SOAP…
JSON is an acronym for JavaScript Object Notation. It is a text-string data transport mechanism, capable of representing simple or complex data structures in a consistent and easy-to-read manner. Similar in concept to XML, but more efficient and more widely supported, JSON has become the dominant technology for use in AJAX applications, APIs, and other data interchange applications where data structure and data elements must be communicated between applications and web services.
JSON is frequently found in combination with RESTful APIs, where XML has rightly fallen into disuse. This article will examine some of the ways XML and JSON are similar and different, and will show ways of using JSON to our advantage.
Some code examples will show how to create and interpret JSON strings, and detect JSON errors.
A Bit of Test Data
Since the most important thing a programmer can have is a good test case, let's start with some good test data. Here is the information we will use for all of our code examples. This information will represent people, giving their names and ZIP codes. While the example is truly minimalist, it's sufficient to illustrate the principles.
firstName lastName zipCode
John Doe 20007
Mary Doe 20016
A Bit of Test Data Organization
Both XML and JSON can represent the data structure. Here is how our data will be organized.
People (with a date attribute)
|_ Person
|_firstName
|_lastName
|_zipCode
The Old School Way: XML
XML, or Extensible Markup Language, is a text-string data transport mechanism. It was popularized in the 1990s when SOAP…
Active today
Ray,
Great article (as always) :). I just wanted to address the "Using JSON Strings in JavaScript" section of your article.
I'd like to see the distinction between JavaScript and jQuery/AngularJS to show that jQuery & AngularJS are frameworks of the JavaScript language. In otherwords, they are just JavaScript. They do not implement their own version of the ECMA-262 standards. Node.js on the other hand DOES have its own version but being only a server side language, that's a different story.
On another note, JSON in the browser still needs to be decoded from a string to be a useful JavaScript native object. Any data that PHP returns in JSON format will need to be decoded using the JSON.parse() native JavaScript function. jQuery will do this automatically when the getJSON() or ajax() with the dataType set to "json" but vanilla JavaScript will not. For your reference: http://www.w3schools.com/js/js_json.asp
Following on from this, the example you go on to give isn't a string, but a JS object. I'd like to see an example of using the native functions for converting JSON strings to objects as indicated here: http://www.w3schools.com/js/js_json.asp
Great article (as always) :). I just wanted to address the "Using JSON Strings in JavaScript" section of your article.
I'd like to see the distinction between JavaScript and jQuery/AngularJS to show that jQuery & AngularJS are frameworks of the JavaScript language. In otherwords, they are just JavaScript. They do not implement their own version of the ECMA-262 standards. Node.js on the other hand DOES have its own version but being only a server side language, that's a different story.
On another note, JSON in the browser still needs to be decoded from a string to be a useful JavaScript native object. Any data that PHP returns in JSON format will need to be decoded using the JSON.parse() native JavaScript function. jQuery will do this automatically when the getJSON() or ajax() with the dataType set to "json" but vanilla JavaScript will not. For your reference: http://www.w3schools.com/js/js_json.asp
Following on from this, the example you go on to give isn't a string, but a JS object. I'd like to see an example of using the native functions for converting JSON strings to objects as indicated here: http://www.w3schools.com/js/js_json.asp
Comment Utility
Hey, Rob. Thanks for your comments. Why not add your clarification examples to the comment thread here, or post a new article about this? Especially if any of my old code and data examples are overtaken by current events... technology is always advancing!
How to build a simple, quick and effective accordion menu using just 15 lines of jQuery and 2 css classes
We will take a look at the d3.js library for visualizations. I will provide a walkthrough of a short bar graph example as well as introduce you to the d3.js API. We also will explore links of other examples and further information regarding SVG's.
On Demand Webinar: Networking for the Cloud Era
Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.
The Challenge
I was developing a new website for a client the other week in WordPress and they asked me if it was possible to track the clicks of the sponsor images they include on their home page. My first port of call was to use the Yoast Google Analytics plugin but for some reason, it didn't work and I wanted finer control of how my events were presented in the Google Analytics (GA) dashboard.So, I was left wondering how difficult it would be to write some JavaScript to dynamically assign the event push to Google Analytics using the onclick event.
This article describes how I solved that and as it's JavaScript, the solution can be used in any website design.
The Solution
The method relies on the addEventListener() method which attaches an event handler to the chosen document element. A good introduction to this method can be found at w3schools:http://www.w3schools.com/j
The syntax for adding the event listener is:
document.addEventListener(event, function, useCapture)
So the starting point of the solution creates the event in the bubbling phase:
if (document.addEventListener)
document.addEventListener('click', callback, false);
else
document.attachEvent('onclick', callback);
Once this is done, whenever a user clicks on the page the function callback will be executed.
So we next need to define what the callback function will do.
The first thing to do is to pass the user's event to the function:
Active 4 days ago
Hi Jim. I saw that weird hyperlink thing after posting the draft. I didn't put it in there and it appears to be a link to nothing when I checked the source of the page:
<a href="http://" target="_blank">
So, as I don't know how it got there I'm not sure how to delete it but I'll give it a go now.
<a href="http://" target="_blank">
So, as I don't know how it got there I'm not sure how to delete it but I'll give it a go now.
Introduction
Knockoutjs (Knockout) is a JavaScript framework (Model View ViewModel or MVVM framework).
The main ideology behind Knockout is to control from JavaScript how a page looks whilst creating an engaging user experience in the least complicated way as possible.
There are also other frameworks that essentially do the same thing in their own way. Find what works for you. React is what Facebook is built on and is very popular. AngularJS has also gained a lot of momentum and worth checking out.
Knockout takes a basic HTML structure and applies logic (written by you) to control the insertion and removal of HTML elements. This keeps the markup simple and straightforward, especially when it comes to repetitive content.
It's incredibly easy with Knockout to create dynamic interactive web pages with simplified markup. I've seen markup get out of control when creating content both from the server side (e.g. using PHP) or via the client side (e.g. using jQuery), making it virtually impossible to troubleshoot issues with layout and styling.
I come across many questions in the web dev topic areas that are related to issues with the asker's website. Invariably this starts with them being told to fix their markup and validate it through the The World Wide Web Consortium's (W3C) Validation service. When a site doesn't validate, it is not guaranteed to work on all …
Comment Utility
Really interesting stuff! So many technologies so little time.
A couple of typos you may wish to correct. "It incredibly easy" "know no only".
A couple of typos you may wish to correct. "It incredibly easy" "know no only".
In this article you'll learn how to use Ajax calls within your CodeIgniter application. To explain this, I'll illustrate how to implement a simple contact form to allow visitors to send you an email through your web site.
Active today
Well, I'm happy. But I've just realized that today is still May: will this article partecipate to the contest for the Blade-Runner HD?
Introduction
Chart.js, used properly, can visually add a difference to your charting applications. It engages your visitors and allows them to interact with data they otherwise wouldn't be able to without expensive and complicated systems. For this tutorial, I have to assume that you understand basic statistics and how to interpret the data shown in the charts outlined by this tutorial. Chart.js offers the following types of Charts: Line, Bar, Radar, Polar Area, Pie and Doughnut. It is possible to create your own types of charts but one step at a time. These are the types we'll be working with in this tutorial.So what do you need to do to get started?
Bookmark the documentation! http://www.chartjs.org/docEither use a Content Delivery Network (CDN) OR Download the ZIP package and include it with the other files of your website.
I personally recommend to use a CDN via this script tag (version 1.0.2)
<script src="//cdnjs.cloudflare.com/ajax/libs/Chart.js/1.0.2/Chart.min.js"></script>
Extract all the files from the ZIP, however the ONLY file needed is the Chart.min.js, and include it in the relative section of your site: <script src="/relative/path/to/Chart.min.js"></script>
Add jQuery
While we're at it, let's add jQuery to your page:<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>
JavaScript
120K
Solutions
41K
Contributors
JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and in almost every mainstream web browser.
Top Experts In
JavaScript
-
1
HainKurt41,600 points -
2
Julian Hansen31,962 points -
3
Scott Fell, EE MVE6,500 points -
4
M. Tariq6,000 points -
5
Leonidas Dosas6,000 points -
6
Slick8125,400 points -
7
zephyr_hex (Megan)4,500 points -
8
Ryan Chong4,000 points -
9
Jim Riddles4,000 points -
10
Ray Paseur3,687 points -
11
Nitin Sontakke3,000 points -
12
Chris Stanyon2,500 points -
13
gdemaria2,400 points -
14
lenamtl2,400 points -
15
Robert Schutt2,400 points -
16
Marco Gasi2,185 points -
17
it_saige2,000 points -
18
Pankaj Jangir2,000 points -
19
Wayne Herbert2,000 points -
20
Eric Nemchik2,000 points -
21
Sam Wallis2,000 points -
22
footech1,400 points -
23
McKnife1,332 points -
24
DanRollins1,176 points -
25
Nagendra Pratap Singh1,004 points