Strusts Fast Track: J2EE/JSP Framework: Practical Application with Database Access and Struts Extension

JSP Framework: Practical Application with Database Access and Struts Extension
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How to access MySQL database from JSP?

The web standards used in AJAX are well defined, and supported by all major browsers. AJAX applications are browser and platform independent. Web applications have many benefits over desktop applications; they can reach a larger audience, they are easier to install and support, and easier to develop. However, Internet applications are not always as "rich" and user-friendly as traditional desktop applications.

AJAX is based on existing standards. These standards have been used by most developers for several years.

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Review If your application will require processing of large data sets, make sure that you have ample data to put the application under load during development and testing. A mutli-part form expects the page attribute to be set. The request is forwarded to the Struts action which determines the handler class. I stumbled across this presentation a few weeks ago. All form-bean elements will be defined between the form-beans element above. Strange paranoia! You can see two hyperlinks rendered in front of each user record, i.

Because the server returns a new page each time the user submits input, traditional web applications can run slowly and tend to be less user-friendly. With an HTTP request, a web page can make a request to, and get a response from a web server - without reloading the page. The user will stay on the same page, and he or she will not notice that scripts request pages, or send data to a server in the background.

By using the XMLHttpRequest object, a web developer can update a page with data from the server after the page has loaded! Google Suggest is using the XMLHttpRequest object to create a very dynamic web interface: When you start typing in Google's search box, a JavaScript sends the letters off to a server and the server returns a list of suggestions. First, we are going to create a standard HTML form with two text fields: username and time. The username field will be filled in by the user and the time field will be filled in using AJAX.

To create this object, and deal with different browsers, we are going to use a "try and catch" statement.

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You can read more about the try and catch statement in our JavaScript tutorial. Let's update our "testAjax. This is for the Firefox, Opera, and Safari browsers.

If none of the three methods work, the user has a very outdated browser, and he or she will get an alert stating that the browser doesn't support AJAX. Note: The browser-specific code above is long and quite complex. However, this is the code you can use every time you need to create an XMLHttpRequest object, so you can just copy and paste it whenever you need it.

The code above is compatible with all the popular browsers: Internet Explorer, Opera, Firefox, and Safari. Before sending data to the server, we have to explain three important properties of the XMLHttpRequest object. After a request to the server, we need a function that can receive the data that is returned by the server.

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The onreadystatechange property stores the function that will process the response from a server. The following code defines an empty function and sets the onreadystatechange property at the same time:. The readyState property holds the status of the server's response. Each time the readyState changes, the onreadystatechange function will be executed.

We are going to add an If statement to the onreadystatechange function to test if our response is complete this means that we can get our data :. The open method takes three arguments. The second argument specifies the URL of the server-side script. The third argument specifies that the request should be handled asynchronously. The send method sends the request off to the server. Now we must decide when the AJAX function should be executed. We will let the function run "behind the scenes" when the user types something in the username text field:.

The responseText property explained in the previous chapter will store the data returned from the server. Here we want to send back the current time. The code in "time. Note: The Expires property sets how long in minutes a page will be cached on a browser before it expires. If a user returns to the same page before it expires, the cached version is displayed. Great resrouces for learning ajax and other html engineering technologies. Civil Aircraft of the s by Chambers J.

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Struts Fast Track: J2EE/JSP Framework: Practical Application with Database Access and Struts Extension [Vic Cekvenich] on teverjasanfro.gq *FREE* shipping on. Nov 15, Struts fast track: J2EE/JSP framework: practical application with database access and struts extension. by: Cekvenich, Vic. Publication date.

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