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passing array parameter in URL  RSS feed

 
Ranch Hand
Posts: 48
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Hi,

Is it possible to pass an array object in URL? something like..

var emp = new Array();

emp[0] = "Emp1";
emp[1] = "Emp1";
emp[2] = "Emp1";
emp[3] = "Emp1";

then pass using

http://localhost:8080/servlet/MyServlet?empArray=emp;

then in jsp,

request.getParameterValues("emp");

Please advise.
 
Bartender
Posts: 1844
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This is more a html/javascript question than JSP.
In order for request.getParameterValues("emp") to work, you have to pass along a url string something like
myPage.jsp?emp=emp1&emp=emp2&emp=emp3

Notice that the parameter emp appears multiple times, each time with a new value.
You can construct this string yourself in javascript with a simple loop, and navigate to that url.


Alternatively you can use the toString method of an array to turn the values into a comma separated list, and send that as a single parameter.
At the JSP end you would retrieve the parameter, and then use the String.split method to split it on commas, and turn it into a java array.

Whichever approach you use, you should probably use the javascript function window.escape() to escape any characters that might be affected by putting them in a url string.

Good luck,
evnafets
 
Author and ninkuma
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If the array is any size at all you will quickly run out of room in the URL, so this is a very poor way to try and pass anything but small amounts of data.

What are you really trying to accomplish?
 
Greenhorn
Posts: 12
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simply you should retrieve that values by using Enumeration enum1=request.getParameterNames();
while(enumm.hasMoreElements())
{
str=(String)enumm.nextElement();
if (str.indexOf("emp"))>=0)
value=request.getParameter(str);
}

by using this u will receive all emp relative parameters and values.
 
Richard Mendoza
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Posts: 48
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Hi Stefan Evans,

That really helps me a lot! Thanks for help!
 
It is sorta covered in the JavaRanch Style Guide.
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