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validation

 
sujesh Katri
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posted 10 years ago
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some one please tell me where i did mistake given below...My request is not going to servlet....I provided html and servlet code below

1. <html><center>



2. <form name="f1"onsubmit="return validate()"action="./validate"method="get">

3. username: <input type="text"name="t1"id="t1">


4. password: <input type="password"name="p1"id="t2">


5. <input type="submit"value="sign in">

6. </form>

7. <script>

8. function validate()

9. {

10. if((f1.t1.value.length==0)||(f1.t2.value.length==0))

11. {

12. document.getElementById("demo").innerHTML='<h1>'+"invalid username and password"+''

13. }

14. return false;
}
</script>
</html>

servlet code:




import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class validate extends HttpServlet {

protected void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html;charset=UTF-8");

PrintWriter out = response.getWriter();

String uname=request.getParameter("t1");

String pwd=request.getParameter("p1");

out.println(uname+"\n"+pwd);
}
}
thanks...
 
Ulf Dittmer
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posted 10 years ago
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Do you really not have spaces between the attributes of the <form> tag, or is that a copy/paste error? If you don't have them, start with that.

Also, what is the "mistake given below"? How are you using this page, and what happens when you use it?
 
J. Kevin Robbins
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posted 10 years ago
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You also need <body> tags and a closing element for the <center> tag. Your <script> tag should have a "type" attribute.

Please use code tags instead of adding line numbers. Just click the "Code" button above and paste your code between the elements.

"The good news about computers is that they do what you tell them to do. The bad news is that they do what you tell them to do." -- Ted Nelson

 
Paul Ngom
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In addition,
I cannot see any element with id or name
'demo' in your html page.

I am always surprised at the added knowledge i can get from others when i give my opinion on a topic.

 
Bear Bibeault
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Please UseCodeTags when posting code. It will automatically assign line number so you don't have to.

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Henry Wong
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sujesh Katri,

The "report" button is to report an issue / post / rancher to a moderator. It is not used to reply to posts. Please use the "post reply" button below to reply to posts.

Henry

Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)

 
sujesh Katri
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posted 10 years ago
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if i type <script type="javascript">then my javascript validation code is not executed but it send requestparameters to servlet....in my actual code i tyep<p id=demo>but here it is missed.
 
Paul Ngom
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if i type <script type="javascript">then my javascript validation code is not executed but it send requestparameters to servlet....in my actual code i tyep<p id=demo>but here it is missed.


Sujesh,
Try as much as possible to include in double quotes the value of your attributes. Example: <p id="demo">
and it is recommended that you write <script type="text/javascript"> Please post your html page again. Get it right before thinking of the servlet.

I am always surprised at the added knowledge i can get from others when i give my opinion on a topic.

 
sujesh Katri
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posted 10 years ago
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<html><center><p id="demo"></p>
<form name="f1"onsubmit="return validate()"action="./validate"method="get">
username: <input type="text"name="t1"id="t1"><br>
password: <input type="password"name="p1"id="t2"><br>
<input type="submit"value="sign in">
</form>
<script type="text/javascript">
function validate()
{
if((f1.t1.value.length==0)||(f1.t2.value.length==0))
{
document.getElementById("demo").innerHTML='<font color=red><h1>'+"invalid username and password"+'</font>'
}
return false;
}
</script>
</center>
</html>

in the above html code if i write type="text/javascript" my validation i.e if did n't write username and password that error msg won't be display on my browser window......if i remove type attribure then my validation running properly but parameters not going to servlet...some one please provide me solution ...thanks.
 
Paul Ngom
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posted 10 years ago
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Please UseCodeTags when posting code


So many people have told you so. Which editor do you use?
and the following if executed will return false no matter what so your servlet will not get called.

so try to move the return false; inside the if statement like this

I am always surprised at the added knowledge i can get from others when i give my opinion on a topic.

 
Kishor Joshi
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posted 10 years ago
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1)which environment you are using ?

2)Did you map that URL of Servlet class in web.xml file .
 
sujesh Katri
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I'm using netbeans environment and i mapped url to web.xml....After moving return false into if block it is executed successfully....can i know the reason why it happens inside the if block only it is executing properly...Thank you very much.
 
sujesh Katri
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I got the information clearly..Thanks
 
Kishor Joshi
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problem solved? or not?
 
Don't get me started about those stupid light bulbs.
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