Programming Exercise I Construction (Cont.)
  1. Web User Interface Construction [(X)HTML]
    2.  (X)HTML is short for (eXtensible) HyperText Markup Language, the authoring language used to create documents on the World Wide Web. (X)HTML defines the structure and layout of a web document by using a variety of tags and attributes.

    ~/public_html/course/457/2/10.html   (HTML)   (text) 
    <html>
 ...
 <form method="post" 
   action="http://undcemcs01.und.edu/~wen.chen.hu/course/457/2/ListCourses.php">
  <input type="submit" name="act" value="List courses" />
  A list of students’ names:
  <input type="text" name="student" value="poke bob" size="24" />
      (listing all if empty)
  <input type="submit" name="act" value="HTML source" />
  <input type="submit" name="act" value="PHP source" />
  <input type="submit" name="act" value="SQL source" />
  <input type="submit" name="act" value="DigiCertGlobalRootCA.crt.pem" />
  <input type="submit" name="act" value="Help" />
  <input type="reset"             value="Reset" />
 </form>
   ...
</html>
    http://undcemcs01.und.edu/~wen.chen.hu/course/457/2/10.html
    …
        A list of students’ names:   (listing all if empty)

             
    …
    http://undcemcs01.und.edu/~wen.chen.hu/course/457/2/ListCourses.php

    HTML forms are used to select different kinds of user input. A form is an area that can contain form elements. Form elements are elements that allow the user to enter information (like text fields, textarea fields, drop-down menus, radio buttons, checkboxes, etc.) in a form.

    • type="checkbox", which lets a user select one or more options of a limited number of choices,
    • type="text", which specifies a single line text entry field within the form that contains it,
    • type="submit", which submits the form when a user clicks the button, and
    • type="reset", which re-sets all the fields in the form to their initial values when a user clicks the button.