Regex in JSP with beans!

**nick3** · 02-20-2009, 05:51 AM

Hello!
I have a small problem with my JSP-code, im "playing" to learn abit so the program dont really do much but still... I want to get a regex to check the input in my form, but dont know how i can do that when im using beans in JSP.

Here is my first codepart (index.jsp)

Code:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>

<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Submit!</title>
        <link type="text/css" href="Style.css" rel="stylesheet"/>
    </head>
    <body>
    <logo><img src="logo.jpg" width="459" height="152" alt="logo"/></logo>

<div1>
<form method=POST action="submit.jsp">
    <label>Item:</label> <input type="text" name="item" size="20"<BR>
    <label>Price:</label> <input type="text" name="price" size="20"<BR>
    <label>Stock:</label> <input type="text" name="stock" size="20"<BR>
<input type="submit" value="Lägg in item">
</form>
</div1>

</body>
</html>

Here is the page i send the form to and where the bean gets the form and sends it to my Java-class (next codepart)

Code:

<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@page import="java.io.*" %>
<%@ page import="java.util.*" %>
<%@page import="item.Items" %> 
<jsp:useBean id="item" scope="page" class="item.Items" />
<jsp:setProperty name="item" property="*" />


<% if(session.getAttribute("Array") == null) {
    ArrayList<Items> arr = new ArrayList<Items>();
    arr.add(item);
    session.setAttribute("Array", arr);
}
   else {
    ArrayList<Items> ar2 = (ArrayList<Items>) session.getAttribute("Array");
    ar2.add(item);
    session.removeAttribute("Array");
    session.setAttribute("Array", ar2);
   }  
response.sendRedirect("view.jsp");    
%>

Here is my Javaclass...

Code:

public class Items {
    private String item;
    private int price, stock;

    public int getStock() {
        return stock;
    }

    public void setStock(int stock) {
        this.stock = stock;
    }

    public void setItem( String value )
    {
        item = value;
    }

    public void setPrice( int value )
    {
        price = value;
    }

    public String getItem(){

        return item;
    }

    public int getPrice(){

        return price;
    }

}

Now to my question, where and how do i put my Regex so the user can get a errormsg in index if he types anything wrong? And lets him correct it. I would love an example in my own code so i know how to do.

/Nick3

**WingedPanther** · 02-20-2009, 06:49 AM

You would need to do that with JavaScript that is triggered when the user tries to submit the form.

**nick3** · 02-20-2009, 06:52 AM

Hmm ok, i dont know any javascript really, if its not to complicated, like to show me how to do it?

**WingedPanther** · 02-20-2009, 07:00 AM

I would recommend reading up on javascript at W3Schools Online Web Tutorials . There is a LOT you can do with it, and the details of what you want will affect the code you use.