How to pass a variable in javascript

Question

I am building a bookmarlet based on this site: http://www.latentmotion.com/how-to-create-a-jquery-bookmarklet/

This is the code of bookmarlet:

javascript:(function(){
    var head=document.getElementsByTagName('head')0],
         script=document.createElement('script');
    script.type='text/javascript';
    script.src='http://myserver.com/bookmarlet-remote.js?' + Math.floor(Math.random()*99999);
    head.appendChild(script);
})(); 
void 0

How I can pass a variable from the bookmarlet (above code), to bookmarlet-remote.js ?

I've tried after var myNewvar='myValue', without success, Any Idea?

Try creating a variable without using var.

James
– James

2011-05-24 16:11:15 +00:00
Commented May 24, 2011 at 16:11 — James
– James, Commented May 24, 2011 at 16:11

Adam Bergmark · Accepted Answer · 2011-05-24 16:14:36Z

5

All JS code on a page (including bookmarklet code and scripts included have) have access to the global scope. If you define a variable without the var prefix it will be available to all other scripts.

It might be a good idea to be explicit about this. do window.myVar = "foo"; to clearly signal that you are working with global variables.

answered May 24, 2011 at 16:14

Adam Bergmark

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Comments

Adam Bergmark · Accepted Answer · 2011-05-24 16:26:41Z

1

Using var in the function makes it local to that function. To make it global you have to add it to the scope of the window, so:

window.newVariable = window.newVariable || 'Your new value here';

OR

window['newVariable'] = 'Your new value here';

edited May 24, 2011 at 16:26

Adam Bergmark

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answered May 24, 2011 at 16:15

Anthony Corbelli

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3 Comments

Anthony Corbelli Over a year ago

The first option prevents you from overwriting the variable if you've already defined it, the second just adds it to the set of variables available in the global scope.

Matt Over a year ago

You want || not |. || is OR, | is bitwise OR, which is completely different

ic3b3rg Over a year ago

Also, it needs to be window not Window.

ic3b3rg · Accepted Answer · 2011-05-24 16:14:19Z

0

You'd create a public variable.

window.rnd = Math.floor(Math.random()*99999);

In bookmarlet-remote.js you just access the variable.

answered May 24, 2011 at 16:14

ic3b3rg

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2 Comments

Adam Bergmark Over a year ago

drop the var here since the code he writes is inside a function body.

ic3b3rg Over a year ago

yup... saw my mistake and corrected it before I saw your comment.

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