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Tab ordering A Web server for debugging forms This chapter discusses using HTML forms as front ends to servlets or other server-side programs. These forms provide simple and reliable user interface controls to collect data from the user and transmit it to the servlet. The following chapter discusses the use of applets as servlet front ends.
Using applets in this role requires considerably more effort and has some security limitations. However, it permits a much richer user interface and can support significantly more efficient and flexible network communication.
To use forms, you'll need to know where to place regular HTML files in order to make them accessible to the Web server. Each of the controls typically has a name and a value, where the name is specified in the HTML and the value comes either from the HTML or by means of user input.
Here, the POST request line, the HTTP request headers, and a blank line are first sent to the server, and then the data string is sent on the following line. For example, Listing The HTML elements that make up this form are discussed in detail in the rest of this chapter, but for now note a couple of things.
First, observe that one text field has a name of firstName and the other has a name of lastName. Second, note that the GUI controls are considered text-level inline elements, so you need to use explicit HTML formatting to make sure that the controls appear next to the text describing them.
Finally, notice that the FORM element designates http: Before submitting the form, I start a server program called EchoServer on port of my local machine.
EchoServer, shown in Section That's the general idea behind HTML forms: Extracting the names and values on the server is straightforward in servlets: The remainder of this chapter covers options in setting up forms and the various GUI controls you can put in them.Jan 25, · HTML program to illustrate table tag and its attri Java program to animate ball or moving ball using Java program to create user defined exception hand.
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This wikiHow teaches you how to create a webpage using HTML. Some elements of your webpage can include text, links, and alphabetnyc.com: K.