jsp validation function

kondakindi · Jul 27, 2005

Hi,
I have a select box in the jsp page i would like to check if the user has selected any item if not it should not proceeed and reload the same page with error stating you have to select .
i have wriiten a function to check null values it doesn't work..
<select name="q_value">
<option value="q_val" " <%= isMultipleSelected(request, "q_value" , q_val)%> ">One
</select>

funtion is :

<%! public static String[] getFormElementValues(HttpServletRequest request, String formElementName)
{
String [] values = null;
if (!((request ==null) || (formElementName ==null)||(request.getParameter(formElementName) ==null)))
{
values = (String[])request.getParameterValues(formElementName);
}

return values;
}

public static String isMultipleSelected (HttpServletRequest request, String param, String testValue)
{
if (getFormElementValues(request, param) != null )
{
String[] values = getFormElementValues(request, param);
for(int i =0;i<values.length;i++)
{
String Value = (String)values;
if(Value.equals(testValue))
return " selected ";
}
}
return "";
}
%>

Do let me know is it right...
Thanks,

Diancecht · Jul 27, 2005

There's a JSP forum for questions like this.

Anyway

what does your funtion do?
what error do you get?
what are the actual and expected results?

Cheers,

Dian

prosper · Jul 27, 2005

<%
response.setHeader("Cache-Control","no-store"); //HTTP 1.1
response.setHeader("Pragma","no-cache"); //HTTP 1.0
response.setDateHeader ("Expires", 0); //prevents caching at the proxy server
String selectVal = request.getParameter("s01");
System.out.println(selectVal);
int choice = 0;
if (selectVal!=null)
{
selectVal = selectVal.replaceAll("c","");
choice = Integer.parseInt(selectVal);
}
%>
<html>
<head>
</head>
<body>
<form action="form.jsp">
<select name="s01">
<option value="" >select one</option>
<option value="c1" <% if (choice==1) {%>selected<%}%> >one</option>
<option value="c2" <% if (choice==2) {%>selected<%}%> >two</option>
</select>
<input type="submit" name="submit" value="submit">
</form>
</body>
</html>
// this is a simple jsp, you should consider the result from the select box is null after the jsp is first load

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jsp validation function

kondakindi

IS-IT--Management

Diancecht

Programmer

prosper

Programmer

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