[Javascript] passing variables - basic question

[Rodney Myers]

Kynan,

Using the query string is a perfectly good way to do it. The alternative
would be cookies.

Thing to understand about using query strings with javascript is that
there is no server-side-type mechanism for picking up values of
name=value pairs. I believe in PHP it would be $selectedpicture ?

In js all you are doing is parsing the query string. So 
href="picture.html?pictureone.jpg"
could be used, just as well as 
href="picture.html?selectedpicture=pictureone.jpg"
if that was all you were using the query string for in these pages.

window.location.query gets you the string beginning with the "?" char. 
Except js may not believe it is really a string hence the ""+ in the
line below which forces to string type.

 
var qs = ""+window.location.query;
qs=qs.substring(1);

Now qs has the value of "selectedpicture=pictureone.jpg" or
"pictureone.jpg"
The second alternative would be less work to deal with, I think.

hth

Rodney

"Cheng, Kynan (London)" wrote:
> 
> Hi guys,
> 
> I have not coded in Javascript before and I am trying to find out how to
> pass variables from page to page, so I was wondering if someone could look
> this over briefly:
> 
> For example, if I have a page with thumbnail, and I'd like to call a page
> that dynamically places the original photo into it (based on the thumbnail
> clicked) does it go a little something like this?
> 
>  in index.html:
> <a href="picture.html?selectedpicture=pictureone.jpg"><img
> src="thumbnailone.gif"></a>
> 
>  in picture.html
> (PHP version) <a href="index.html"><img src="<?php print $selected picture
> ?>"></a>
> (JS version) which doesn't work
> <script>
> document.write("<a href='index.html'><img src=", selectedpicture , "></a>")
> </script>
> 
> Do i need to have some script which takes in the URL argument?
> Is there another (better) way to pass variables?


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Rodney Myers
Based in Oxford, England
Technical Director, Shop at ssistant eCommerce Solutions