daina
02-09-2006, 12:14 AM
Hi
I did custom tag like this.
FirstCustomPage.jsp:---
<%@ taglib uri="/customtable1" prefix="customtable" %>
<form name="form1" method="post" action="DemoServlet" >
<table border = 2>
<tr>
<customtable:customtd name="UserId" value="" />
</tr>
<tr>
<customtable:customtd name="UserName" value="" />
</tr>
<tr>
<td>
<input type = submit value = Submit>
</td>
</tr>
</table>
</form>
CustomTagDemo.java:-
public class CustomTagDemoextends TagSupport{
private String name;
private String value ;
public int doStartTag() throws JspException {
JspWriter out = pageContext.getOut();
StringBuffer sb = new StringBuffer();
sb.append("<td><b> " + name + "<//b></td><td><input type = text name ="+name+"");
String valueObject = pageContext.getRequest().getParameter(name);
if(valueObject != null)
{
System.out.println("inside valueObject" + valueObject);
sb.append(" value=\"" + valueObject + "\"");
}
sb.append(" /></td>");
if(valueObject != null && valueObject.equals(""))
{
sb.append("<td><font color=red>Please Enter the value</font></td>");
}
return SKIP_BODY;
}
public void setValue(String _value)
{
value = _value;
}
public String getValue() {
return value;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
DemoServlet.java:--
public class DemoServlet extends HttpServlet {
protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
Enumeration enum = req.getParameterNames();
while(enum.hasMoreElements())
{
String value = req.getParameter(enum.nextElement().toString());
if(value.equals("")){
RequestDispatcher dispatcher = req.getRequestDispatcher("/FirstCustomPage.jsp");
if (dispatcher != null)
dispatcher.forward(req, res);
}
}
}
Its working fine.But I can't do checking in servlet.After checking only then control should go to Servlet.So I have to remove that code from servlet.I have to check in JSP Page only(cannot use javascript). I don't know how to do that.Can u plz tell me how to do it without using JavaScript.Is there any other way to validate textbox.
I did custom tag like this.
FirstCustomPage.jsp:---
<%@ taglib uri="/customtable1" prefix="customtable" %>
<form name="form1" method="post" action="DemoServlet" >
<table border = 2>
<tr>
<customtable:customtd name="UserId" value="" />
</tr>
<tr>
<customtable:customtd name="UserName" value="" />
</tr>
<tr>
<td>
<input type = submit value = Submit>
</td>
</tr>
</table>
</form>
CustomTagDemo.java:-
public class CustomTagDemoextends TagSupport{
private String name;
private String value ;
public int doStartTag() throws JspException {
JspWriter out = pageContext.getOut();
StringBuffer sb = new StringBuffer();
sb.append("<td><b> " + name + "<//b></td><td><input type = text name ="+name+"");
String valueObject = pageContext.getRequest().getParameter(name);
if(valueObject != null)
{
System.out.println("inside valueObject" + valueObject);
sb.append(" value=\"" + valueObject + "\"");
}
sb.append(" /></td>");
if(valueObject != null && valueObject.equals(""))
{
sb.append("<td><font color=red>Please Enter the value</font></td>");
}
return SKIP_BODY;
}
public void setValue(String _value)
{
value = _value;
}
public String getValue() {
return value;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}
DemoServlet.java:--
public class DemoServlet extends HttpServlet {
protected void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
Enumeration enum = req.getParameterNames();
while(enum.hasMoreElements())
{
String value = req.getParameter(enum.nextElement().toString());
if(value.equals("")){
RequestDispatcher dispatcher = req.getRequestDispatcher("/FirstCustomPage.jsp");
if (dispatcher != null)
dispatcher.forward(req, res);
}
}
}
Its working fine.But I can't do checking in servlet.After checking only then control should go to Servlet.So I have to remove that code from servlet.I have to check in JSP Page only(cannot use javascript). I don't know how to do that.Can u plz tell me how to do it without using JavaScript.Is there any other way to validate textbox.