Java/Servlets/JavaScript Servlets
Validate email
/* functions.js
<script language="JavaScript">
function CheckEmail(email)
{
var firstchunk,indx,secondchunk
if (email == ""){
alert("Please make sure you have entered a valid email before submitting the info.")
return false
}
//get the zero-based index of the "@" character
indx = email.indexOf("@")
//if the string does not contain an @ then then return true
if (indx == -1 ){
alert("Please make sure you have entered a valid email before submitting the info.")
return false
}
//if the first part of email is < 2 chars and second part < 7 chars
//(arbitrary but workable criteria) then reject the input address
firstchunk = email.substr(0,indx) //up to but not including the "@"
//start at char following the "@" and include up to end of email addr
secondchunk = email.substr(indx + 1)
//if the part following the "@" does not include a period "." then
//also return false
if ((firstchunk.length < 2 ) || (secondchunk.length < 7) ||
(secondchunk.indexOf(".") == -1)){
alert("Please make sure you have entered a valid email before submitting the info.")
return false
}
//the email was okay; at least it had a @, more than 1 username chars,
//more than 6 chars after the "@", and the substring after the "@"
// contained a "." char
return true
}
function CreateWindow(uri) {
var newWin = window.open(uri,"newwin1","width=500,height=400,resizable,scrollable,scrollbars=yes");
newWin.focus();
}
</script>
*/
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ModuleServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html><head>");
RequestDispatcher dispatcher = request
.getRequestDispatcher("/WEB-INF/functions.js");
dispatcher.include(request, response);
out.println("<title>Client Forms</title></head><body>");
out.println("<h2>Enter Your Name and Email</h2>");
out
.println("<form action=\"/home/displayHeaders.jsp\" name=\"entryForm\" onSubmit=\" return CheckEmail(this.email.value)\">");
out.println("<table border=\"0\"><tr><td valign=\"top\">");
out
.println("First and last name: </td> <td valign=\"top\"><input type=\"text\" name=\"name\" size=\"20\"></td></tr>");
out.println("<tr><td valign=\"top\">");
out
.println("Email: </td> <td valign=\"top\"><input type=\"text\" name=\"email\" size=\"20\"></td>");
out
.println("<tr><td valign=\"top\"><input type=\"submit\" value=\"Submit\" ></td>");
out.println("</tr></table></form>");
out.println("</body></html>");
} //end doGet
}
Validation
/* validate.js
<script language="JavaScript">
function validate(form1)
{
for (i = 0; i < form1.length; i++){
if( (form1.elements[i].value == "") ){
alert("You must provide a value for the field named: " + form1.elements[i].name)
return false
}
}
return true
}
</script>
*/
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FormServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, java.io.IOException {
response.setContentType("text/html");
java.io.PrintWriter out = response.getWriter();
out.println("<html><head>");
RequestDispatcher dispatcher = request
.getRequestDispatcher("/WEB-INF/validate.js");
dispatcher.include(request, response);
out.println("<title>Help Page</title></head><body>");
out.println("<h2>Please submit your information</h2>");
out.println("<form action =\"" + request.getContextPath()
+ "/displayHeaders.jsp\" onSubmit=\" return validate(this)\">");
out.println("<table border=\"0\"><tr><td valign=\"top\">");
out.println("Your name: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"username\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("Your email: </td> <td valign=\"top\">");
out.println("<input type=\"text\" name=\"email\" size=\"20\">");
out.println("</td></tr><tr><td valign=\"top\">");
out.println("<input type=\"submit\" value=\"Submit Info\"></td></tr>");
out.println("</table></form>");
out.println("</body></html>");
out.close();
}
}
