JSP / JSTL :: Pass Value And Validate
Feb 15, 2013
Why will this NOT validate correctly in my IF Statement? Basically, a user chooses an option from the drop down list. The value is passed to t.jsp (itself) and if the option "All" is chosen, then it does something. If any of the years are chosen, then it does something else.
t.jsp (simplified version of what I want)
<%@ page import="java.sql.*" %>
<%@ page import="java.io.*" %>
<html>
<form method="get" action="t.jsp">
Select Year:
[Code] ....
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Mar 7, 2015
I have a variable <c:set var="var1" value = "myvalue" /> , I want to pass var1 as <%= new customclass().method1(var1) %>.what is the syntax to pass this value.
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Nov 5, 2014
I created a GUI with a jTextField as an input box and am wondering how to validate that this data is an integer from 0 - 9. Here is what I have. However the if statement shows an error that says int cannot be dereferenced.
private void doneButtonActionPerformed(java.awt.event.ActionEvent evt) {
//Create and Initialize Variable
int category = Integer.parseInt(categoryInput.getText());
if (category.matches(0-9)); //int cannot be dereferenced error here
{
[Code]...
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Apr 21, 2014
I want to validate username and password in JavaScript. I want to validate username and password with database values. If login failed i want to display alert message...ok. But problem is that i have index.jsp page. After clicking login button control goes to homepage.
jsp..okk.. in index.jsp I have taken dropdown to show designation. I select design then control goes to respective homepage... in homepage. I am checking username and password with database values. If login successful it goes to respective pages but if login failed it has to show me alert message. How can i do that ?
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Jun 5, 2014
I have a JSP which will let a user register for an account at my website. If the user submits wrong or illegal info into the JSP, then I want to return the same JSP with an appropriate error message next to/above each wrongly filled (form) fields.
If possible, highlight the wrongly filled form field - this feature is not necessary though.
I have given a sample below to show what I need. I understand that the sample must be using something like javascript, but I don't know all that client side scripting. I only want to use JSP to do it. As I said, I want to sort of return the JSP form to the user after marking all the mistakes and how to correct them.
How do I do this ?
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May 14, 2014
I'm guessing the vehicle checklist is for making your car? So like for the tires there would be 3 options and you check which one you want?
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Oct 13, 2014
Below is my current program for my java class. The assignment is to validate a date when entered by user.
import java.util.*;
public class Date{
public static void main (String arg[]){
int month = 0;
int day = 0;
int year = 0;
[Code] ......
My issue with my program is the output for the day.
If I enter 30 for the date I get this: Date is invalid
Date is invalid
Date is invalid
Date is invalid
Date is invalid
I wanted to know how what is wrong and why it is doing this.
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Aug 9, 2010
I have a click button called log off , here once a user clicks it , task goes to logout servlet to end current user session . below is my code , I don't know why it works fine with mozilla firefox and google chrom but not working with internet explorer.
response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0);
HttpSession httpSession = request.getSession();
[Code] ....
here it goes fine to my index, but if I logged in again, I should enter a new session , but unfortunately this not happened in explorer , works fine with mozilla , and chroom.
I have also done in my index.jsp the check like below:
<%
if(session!=null){
session.setAttribute("validUser",null);
session.invalidate();
%>
just to erase whatever previous session . But why session exist on same page ! only in explorer , it makes me open new explorer for new user and that is what I don't want !
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Oct 20, 2014
I need to validate an input box so that the user can enter only round numbers.
The user can't enter any other characters except 0 to 9, they shouldn't be able to enter decimal points either.
They would be answering questions like, 'What is 7 times 8?'
Also, I need to validate it so that the program doesnt crash if they leave the input box blank or empty.
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Apr 22, 2013
Code given below does real time validation for 2 JTextFields. While entering some values to txt1 and txt2 enables the save button and removing values from txt2 or txt1 reset the save button to disable. I use Netbeans as IDE.What I want to do is, enable Save button after checking multiple JTextFields for validity. If any of the text fields is empty, btnSave must be disabled.This program gives expected result up to some extent. But there is little issue. After form appears for the first time, When I type something on Textfield1, Save button enables without checking Textfield2. This happens only at the first time.
public class NewJFrame extends javax.swing.JFrame {
private Boolean isValidFromTextField1 = true;
private Boolean isValidFromTextField2 = true;
public NewJFrame() {
initComponents();
btnSave.setEnabled(false);
[code]....
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Jan 23, 2015
I am trying to implement an example (Book* : Java SE 7 ..By S G Ganesh) for validating an IP address but it fails to validate a valid IP addresses. I found another example on the internet(**) and it works super fine, no problem at all. I edited the code (the one I got from internet) into the exact format like book and it still works super but i don't understand why the books' example doesn't work though both look exactly the same now ,further more, how can i compare String x and y for equality?
public class TestClass {
void validateIP(String ipStr) {
String one = "((25[0-5]|2[0-4]d|[01]?dd?)(.)){3}(25[0-5]|2[0-4]d|[01]?dd?)"; //copied from internet and edited
String two = "((25[0–5]|2[0–4]d|[01]?dd?)(.)){3}(25[0–5]|2[0–4]d|[01]?dd?)"; // copied from book
String x = "((25[0-5]|2[0-4]d|[01]?dd?)(.))";
String y ="((25[0–5]|2[0–4]d|[01]?dd?)(.))";
[Code] ....
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Feb 18, 2014
How can I validate the postal code based on this condition...
9999 may not be used for US province .
If the street province is Mexico or Argentina or Brazil the street postal code must be 9999 ....
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Oct 14, 2014
I am working in the field of validating data. I need to validate names and test scores and i keeping getting errors in my code. I keep tracing back all the errors and now I am stuck at a logic error. It is giving me a the validate sentence over and over even when i type stuff in. I have searched up how to do the .equals to a string but it doesn't give me a accurate enough to my problem.
import java.util.Scanner;
public class P5A
{
public static void main (String args[]) {
System.out.println( "Always Show" );
Scanner reader = new Scanner(System.in);
[Code] .....
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Apr 19, 2014
I am trying to match validate user input via regex comparison. But i fail to do so.
The string that will be inserted will have the following pattern: "digit/s " and it can be repeated a random number of times.
The program will extend to characters in the future but for now i am struggling with digits.
i am using a StringBuilder to build the regex string. Or maybe i could use something else but so far i didn't make it.
So far i have this regex
Java Code: "(d+s+)+" mh_sh_highlight_all('java');
The problem is that the newline character will interfere with the last number.
So if i enter
Java Code: "3 4 555" mh_sh_highlight_all('java');
- it will not match. And the regex will only see 3 4.
But if i enter
Java Code: "3 4 555 " mh_sh_highlight_all('java');
- with an extra space at the end it works. Obviously that is not the desired case.
I did find a workaround, but i fear it is somewhat broken
I changed to
Java Code: "(d+s*)+" mh_sh_highlight_all('java');
But in this case the pattern should see 3 4 5 5 5 as the regular expression. Am i correct?
I also tried some other variants but none of them worked:
Java Code: "d+(s+|*)" mh_sh_highlight_all('java');
Or i could do something like
Java Code: "(d+s){" + i + "}" mh_sh_highlight_all('java');
- where i is the number of values i enter.
Am i on the right track here? What am i forgetting?
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Jun 22, 2014
I have to validate a string whether it is a combination lowercase and uppercase and has the character '_'.
I m having trouble in framing the expression for these conditions in the matches function.
How it can be done..?? How to frame a the correct expression.
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May 18, 2014
How to read the excel sheet data and validate that null values are inserted or columns data exceeded with respected to header.and these validated data should be stored into 3 different tables... My requirement is college data excel sheet with combination of all groups like mba,mca,and etc...then re ad the data and find the groups then
1. give entry in the UP_LOAD_DATA_HIST table with this excel data uploading with this user and this date,
2. find the group of the department and save data into CATAGIRY_TBL.
3. Finally save the All data into the students table.
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Sep 9, 2014
I am trying to write a webservice class which actually handles multipart requests. T client will try to upload zip or tar.gz files which may be upto 1GB in size.
I dont want to validate the extension i client side.
I want to validate the file extension in server side and discard the request before the file is uploaded.
How can I do this?
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Mar 12, 2014
I am fetching records from result set and displaying on JSP with <c:forEach> tag
<c:forEach var="outer" items='${ProductList}' varStatus="seq1">
<tr>
<td class='center' nowrap><input type="radio" name="view" id = "view" value="Y" ></td>
<td class='left' nowrap><c:out value='${outer.sourceIndex}' /></td>
<td class='left' nowrap><c:out value='${outer.prodNameAbbr}' /></td>
<td class='left' nowrap><c:out value='${outer.productName}' /></td>
<td class='left' nowrap><c:out value='${outer.effectiveDate}' /></td>
<td class='left' nowrap><c:out value='${outer.uuName}' /></td>
</tr>
</c:forEach>
Below is one row with radio button
SourceIndex ProductAbbreviation Product Name Effective Date UseID
ABC PQR Test123 03/12/2014 smj
I have a view button also to select above radio button. When I select that I need all above values to be set in request.
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May 25, 2014
translate this part to jstl and el?
<%
while(i<nrows){
if(i==0){
%>
<tr>
<td ><b>id_article</b></td>
<td ><b><font color="#FF0033">nbr_stock</font></b></td>
<td ><b>critical_nbr</b></td>
<td ><b><font color="#FF0033">date_first_stock</font></b></td>
[code]....
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Sep 9, 2014
I am looking at JSP page, which has code line as follows
<%@ page language="java" contentType="text/html; charset=UTF-8"%>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean" prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic" prefix="logic" %>
This taglib will have to be installed on local environment. How is it referred in jsp ? I dont see any code in jsp, which refers to the location of JSTL. So how does jsp invoke these tags ? Is it through classpath ?If its so , how is classpath set for JSTL ? Is it just as classpath is set for java ?
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Jun 21, 2006
i am doing a code using JSTL to fire a query. everything come fine except the resule is not sorted as desired. i am putting the code below--
String sort_order=(String)request.getAttribute("sort_order");
request.setAttribute("sort_order",sort_order);
<sql:query var="viewQueryj" sql= "select USER_ID, PERMISSION_ID, USER_NAME from administrator order by ?">
<sql:param value="${sort_order}"/>
</sql:query>
now the resule is always sorted by USER_ID. if i want to sort it using USER_NAME i pass parameter from controller to this page in sort_oredr variable which comes fine but the result doesn't sort by name, only by id. if i hardcode USER_NAME in query then the result is as desired.
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Aug 29, 2014
I want to use the list element inside my scriptlet. Below is my code which is not working.
<c:forEach var="social" items="${sociallist}">
<%
callToFunction(%>${social}<%);
%>
</c:forEach>
How can i access social var inside scriptlet.
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Jul 31, 2014
In JSP page: firstly set the setter of a entity in bean and then set it in session,request etc. and gvet values using foreach loop as follow :
<jsp:useBean id="st" class="beans.student">
<jsp:setProperty name="st" property="roll_no"/>
</jsp:useBean>
<%
[Code]....
Here start is the variable whose value will vary after every time i visit this function.So how would i be able to use above query.
P.S. i was using scriplet before and i was able to deal these issues with scriplet easily.
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Jan 25, 2014
I have the following data in a file called books.xml in my WEB-INF folder:
<?xml version="1.0"?>
<books>
<book>
<name>Padam History</name>
[Code] ....
I'm using the following code in a jsp:
<c:import var="bookInfo" url="/WEB-INF/books.xml" />
I know that it's finding the file because if I delete books.xml from the WEB-INF folder I get a FileNotFound exception.
However, for some reason it doesn't appear to be importing the data into the bookInfo variable.
I noticed this problem because when I try to parse it via:
<x:parse xml="${bookInfo}" var="output"/>
I get org.xml.sax.SAXParseException: Premature end of file.
When I try to display the data in the variable either by:
<c:out value="${bookInfo}" />
...or by means of a scriptlet (which I realize is not a best practice):
<%
String myVariable = (String)pageContext.getAttribute("bookInfo");
System.out.print("bookInfo=" + myVariable);
%>
...I get nothing.
BTW when I do:
<c:import var="data" url="http://www.tutorialspoint.com"/>
<c:out value="${data}"/>
that works fine!
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Aug 18, 2014
I have a HashMap returned from the server. There are two conditions
1. HashMap returned with only one set of key value pair or
2. HashMap with multiple set of data key value pairs.
Now in UI I have to display either text box or drop down box depending upon the size of map for that I am using length method
Java Code:
<c:choose>
<c:when test="${fn:length(myDto.mayMapInDto) eq 1}">
display text box
</c:when>
<c:otherwise>
display drop box
</c:otherwise>
</c:choose> mh_sh_highlight_all('java');
I can display drop box by looping but not sure how I can get only one element for text box. Tricky is I can't use key value to access since UI don't know what key will be returned.
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Mar 14, 2014
I have for values in drop down:
<SELECT name = "productCodeDefault" id="productCodeDefault" value="<c:out value ='${ProductDefBean.productCodeDefault}'/>" >
<OPTION value="" ></OPTION>
<OPTION value="a" >A1</OPTION>
<OPTION value="b" >B1</OPTION>
<OPTION value="c" >C1</OPTION>
<OPTION value="d" >D1</OPTION>
</SELECT>
When I am getting value = "a" from ProductDefBean, In the dropdown 'A1' should get selected. This is not happening. What I need to modify?
Note** When I am doing view Source of my JSP, I am getting value='a'
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