jQuery Get Started

 

applications jquery

May 16,  · Are you just starting out using JavaScript to make web pages? Then this article is for you. (Otherwise it may be too basic.) What I want to do here is to go through the typical process of creating a web page focusing on using JavaScript in the browser. I will assume you have a basic knowledge of and. Learn jQuery step by step using the following tutorials: Overview of jQuery. Introduction to jQuery - jQuery is great library for developing ajax based application. jQuery is great library for the JavaScript programmers, which simplifies the development of web applications. Features of jQuery - Learn the features of jQuery. May 16,  · Introduction. Are you just starting out using JavaScript to make web pages? Then this article is for you. (Otherwise it may be too basic.) What I want to do here is to go through the typical process of creating a web page focusing on using JavaScript in the browser.


jQuery UI Demos | jQuery UI


Are you just starting out using JavaScript to make web pages? Applications jquery this article is for you, applications jquery. Otherwise it may be too basic, applications jquery. As you follow the example put the code into your own.

So let me jump right into it. Now what? Where do you start? Well what else do you need? Go to the website www. One thing that is important to applications jquery before taking on JavaScript is the concept of the Document Object Model, applications jquery. Simply put, this is the in memory representation of your HTML. If you have a html file with markup and you use JavaScript to change something to be a different color, well you aren't actually changing the HTML that is in your.

Great, now applications jquery have the container for the JavaScript. First I'm going to take a lot of the stuff out of applications jquery that we don't need.

Put this in your. That is why its generally accepted best practice to put all script tags as low in the body tag as possible. So it would look like this:. Now with these changes you will see our text show up immediately even though the browser is still waiting on the script file to download.

Super, now the user sees the interface as soon as possible. So now let's have JavaScript actually do something. I want to have a div tag and make it blue, whoa. So let's create some html as such:. Load this into your browser and what do we get? It's not blue.

Hmm, what happened? This brings me to an important point. Well, how do we do this? You might be thinking window. Not so fast. There is one slight issue with window. Some images could be large and would delay the JavaScript from doing what it needs to do, applications jquery.

How do we do this? So what is the point of this jQuery thing? But in reality this is far from true. In this case, jQuery provides a way to notify your JavaScript code that the DOM is ready but not including image downloads and do this in all browsers reliably.

So let's change our applications jquery to use this feature. Let's applications jquery back the reference to jQuery that we previously took out and then use the syntax to define a function that applications jquery called as soon as the DOM is ready not including images. When the DOM is ready the function that we sent in is called and since we have guaranteed that div1 exists before our code executes, we have blue.

You should see "hello" pop up in a dialog box. So how does this work? How does the second script tag know about the variable in the first tag? Where did the variable in the first tag go when it was created? You can think of it as such: even though there may be many script tags applications jquery the page, there is really only one script tag that holds everything.

This is known as the global scope, applications jquery. So where did the variable go, it can't just be floating around in memory. In JavaScript there is one object in memory that holds all the references to all the variables created in the global scope. In the case of the browser the global object is the window object. Each browser will automatically have an object called " window " when the page gets loaded.

This is where our text variable now lives, applications jquery. Using Chrome and its included applications jquery tools we have access to all JavaScript that has been loaded into memory space of the current page. It also allows us to manipulate in memory values and debug running code. Just hit F12 or right click anywhere on the page and choose inspect element. This is an invaluable resource when creating web applications. So if we open the tools and go to the console, this will allow us to access JavaScript objects in the memory of the browser, applications jquery.

Simply start typing and it brings up intellisense to tell you what all is in there. When you type "window" and then ". One of them will be our variable "text". So if you type " window.

Well there is one interesting feature in JavaScript and that is the ability to merge code from all different sources into one web page. Your code, Google's code, applications jquery, Applications jquery Smith's code can all be put into one web page and work all together.

We have applications jquery seen this with our reference to jQuery, applications jquery. You didn't write that code, applications jquery you? So what is the problem with this? Let's load up some simple code, applications jquery. Note : I removed the reference to jQuery. So if you load this page you'll see and alert dialog with the text "what up dollar sign". Ok now lets add the reference to jQuery back but put it in the middle of our code.

If you load the page now, you'll no longer see "what up dollar sign" in the dialog box. Where it go? Its best practice to have only one variable attached to the global object and have the rest of your code run off of that, applications jquery. This is what is sometimes called a namespace. You choose one special unique variable name that nobody else would probably use and that will be where all your code is attached to.

So let's try to use that to implement our complex dollar sign code in our namespace so that jQuery doesn't overwrite it. So if you load this code in your page in run it, you will again see the alert box with "what up dollar sign", jQuery didn't overwrite it, applications jquery.

So if we put everything together we might have something like this:. I'll continue on in another article hopefully.

 

superseat.ga - Building Large-Scale jQuery Applications

 

applications jquery

 

Learn jQuery step by step using the following tutorials: Overview of jQuery. Introduction to jQuery - jQuery is great library for developing ajax based application. jQuery is great library for the JavaScript programmers, which simplifies the development of web applications. Features of jQuery - Learn the features of jQuery. jQuery Mobile framework takes the "write less, do more" mantra to the next level: Instead of writing unique applications for each mobile device or OS, the jQuery mobile framework allows you to design a single highly-branded responsive web site or application that will work on all popular smartphone, tablet, and desktop platforms. Browser Support. The idea behind single page applications (SPA) is to create a smooth browsing experience like the one found in native desktop apps. All of the necessary code for the page is loaded only once and its content gets changed dynamically through JavaScript. If everything is done right the page shouldn't.