QueryStrings Forms
QueryStrings (1/2) Send information via URL

You have already experienced complex URL such as http://www.site.com/rep/liste.asp?id=1257&lng=en&act=del&email=cid@fr.fm ! This presentation consists of learning how to use fractions of URL in order to send information from page to page...

In the following example, the URL contains 5 information:

the address of the page : http://www.site.com/rep/liste.asp ;

the "id" parameter: ?id=1257 ;

the "lng" parameter: &lng=en ;

the "act" parameter: &act=del ;

the "email" parameter: &email=cid@fr.fm

The URL might, for instance, get the following meaning: "The visitor n° 1257, English native asks for his/her email account to be deleted cid@fr.fm from the distribution list " !

We note that the first parameter begins with ? compared to the other ones that start with &

What to do ?

To read the different fractions of the URL in ASP, we use the function QueryString of the object Request : <% if Request.QueryString("lng")="en" then%>    Welcome <%else%>    Bienvenue <%end if%> and to send this information (i.e., language) you just have to add it to the link: <A href="p2.asp?lng=<%=Request.QueryString("lng")%>">

A variable is automatically created with the name of each fraction in ASP: <? if($lng=="en") { ?>    Welcome <? } else { ?>    Bienvenue <? } ?> If not, read the variable as follow: <? $lng=$_GET["lng"]; if($lng=="en") { ?>    Welcome <? } else { ?>    Bienvenue <? } ?> $_GET or $HTTP_GET_VARS or nothing ? and to send this information to another page, you just have to add it to the link: <A href="p2.php?lng=<? echo $lng; ?>">