replace javascript code on the fly

[Console]

I want to immediately change this javascript value on the fly before it redirects me to the page with grease monkey. I am a novice on grease monkey and spent quiet of a few hours reading and experimenting with no luck, if anyone can give me a helping hand on this I would appreciate it. This is the code I want to replace:

" <input id="quantity_1" name="quantity_1" type="hidden" value="20.00" /> "

to " " <input id="quantity_1" name="quantity_1" type="hidden" value="25.00" /> "

If any more info is needed let me know, thank you in advance.

[Hans Henrik Bergan]

// @run-at document-start

function f(){
try{
document.getElementById('quantity_1').value="25.00";
}catch(e){setTimeout(f,5);}
}
f();


will use some cpu (until it has done it's task), and its quite hackish, but i guess i think it should work

[Brian L. Matthews]

So if the page changes in the future to not have a quantity_1 element, greasemonkey will run f every 5 milliseconds... forever. Yeah, f is small and quick, but even small and quick at 200 times per second, doing something that will never succeed, seems bad.

Brian

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[Hans Henrik Bergan]

hello critic :p
remember that it must run fast - he expects to be redirected nearly asap.
how about this code then?

// @run-at document-start

(function f(){
var e=document.getElementById('

quantity_1');

if(e!==null)
{
e.value="25.0";return;
}

if(document.readyState=='

complete'){return;}
setTimeout(f,200);
})();

On Friday, 20 July 2012 22:40:57 UTC+2, blm wrote:

So if the page changes in the future to not have a quantity_1 element, greasemonkey will run f every 5 milliseconds... forever. Yeah, f is small and quick, but even small and quick at 200 times per second, doing something that will never succeed, seems bad.

Brian

On 7/20/12 11:54 AM, Hans Henrik Bergan wrote:

// @run-at document-start

function f(){
try{
document.getElementById('quantity_1').value="25.00";
}catch(e){setTimeout(f,5);}
}
f();


will use some cpu (until it has done it's task), and its quite hackish, but i guess i think it should work
On Friday, 13 July 2012 00:15:15 UTC+2, Console wrote:

I want to immediately change this javascript value on the fly before it redirects me to the page with grease monkey. I am a novice on grease monkey and spent quiet of a few hours reading and experimenting with no luck, if anyone can give me a helping hand on this I would appreciate it. This is the code I want to replace:

" <input id="quantity_1" name="quantity_1" type="hidden" value="20.00" /> "

to " " <input id="quantity_1" name="quantity_1" type="hidden" value="25.00" /> "

If any more info is needed let me know, thank you in advance.

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To view this discussion on the web visit https://groups.google.com/d/msg/greasemonkey-users/-/6tZm8EInLGcJ.

To post to this group, send email to greasemonkey-users@googlegroups.com.
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