Bookmarklet for random url

Martin · Dec 8, 2003

I've found examples of bookmarklets that select a URL from a page at
random, but I'd like one that generates part of the URL at random.

If you have a bunch of images that are named:
mydomain.com/images/abcd.jpg where abcd is can be any combination of 4
lowercase letters - is there a way of having the bookmarklet generate
the letters randomly when clicked?

I'm able to do it using AppleScript & Safari but would like it to work
from within Safari - which is missing the "Scripts" menu that most Apple
apps have

It looks as if bookmarklets are the only option, but I've only ever used
javascript to select randomly from existing arrays of images and don't
fancy typing in the names of a couple of thousand images...

TIA

Lee · Dec 8, 2003

Martin said:

I've found examples of bookmarklets that select a URL from a page at
random, but I'd like one that generates part of the URL at random.

If you have a bunch of images that are named:
mydomain.com/images/abcd.jpg where abcd is can be any combination of 4
lowercase letters - is there a way of having the bookmarklet generate
the letters randomly when clicked?

I'm able to do it using AppleScript & Safari but would like it to work
from within Safari - which is missing the "Scripts" menu that most Apple
apps have

It looks as if bookmarklets are the only option, but I've only ever used
javascript to select randomly from existing arrays of images and don't
fancy typing in the names of a couple of thousand images...

The easy solution is to create a regular bookmark to a page containing:

<html>
<head>
<script type="text/javascript">
function r(){
return Math.floor(Math.random()*26)+"a".charCodeAt();
}
location.replace("mydomain.com/images/"
+String.fromCharCode(r(),r(),r(),r())
+".jpg");
</script>
</head>
<body>
Oops, that image doesn't exist.
</body>
</html>

Martin · Dec 8, 2003

Lee said:
The easy solution is to create a regular bookmark to a page containing:

[snip]

Thanks for that Lee - funny how you get stuck thinking that the answer
lies in one direction (bookmarks) when there is a much simpler solution.

One more question

If I wanted to include numbers as well as letters, do I need to state a
string first (0-9, a-z etc) and get the script to select from items 1-36
of the string or is there a shortcut?

Regards

Lee · Dec 8, 2003

Martin said:

Lee said:
Lee said:

The easy solution is to create a regular bookmark to a page containing:

Click to expand...

[snip]

Thanks for that Lee - funny how you get stuck thinking that the answer
lies in one direction (bookmarks) when there is a much simpler solution.

One more question

If I wanted to include numbers as well as letters, do I need to state a
string first (0-9, a-z etc) and get the script to select from items 1-36
of the string or is there a shortcut?

Nothing simpler comes to mind.

Dr John Stockton · Dec 8, 2003

JRS: In article <[email protected]>, seen in

function r(){
return Math.floor(Math.random()*26)+"a".charCodeAt();
}
location.replace("mydomain.com/images/"
+String.fromCharCode(r(),r(),r(),r())
+".jpg");

For amusement : the first generates a string of up to 4 alphanumerics,
and the second generates four-letter words. 1679616 = 36^4

with (Math) floor(random()*1679616).toString(36)

do { with (Math) x = floor(random()*1679616).toString(36) }
while (!/[a-z]{4}/.test(x))

In the first, subtract 36^3 from 36^4 and add 36^3 to the result of
floor, and there should always be 4 alphanumerics, with the first in
1..z.

This seems OK too :

S = ""
while (S.length<4)
S += "abcdefghijklmnopqrstuvwxyz".charAt(Math.random()*26)
x = "mydomain.com/images/"+S+".jpg"

Martin · Dec 9, 2003

Dr John Stockton said:
This seems OK too :

S = ""
while (S.length<4)
S += "abcdefghijklmnopqrstuvwxyz".charAt(Math.random()*26)
x = "mydomain.com/images/"+S+".jpg"

Thanks

I used this one - as it was the only one I could actually understand

- by adding 0 thru 9 to the string and multiplying by 36.

Regards

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Bookmarklet for random url

Martin

Lee

Martin

Lee

Dr John Stockton

Martin

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