Greasemonkey change value by 5

Scorpion Ghost · Jul 13, 2022

I need Greasemonkey to change a value by 5 in some code. I'm not sure if it's possible, but I think it is.

We have this code:

<input id="some" name="asd" data-bv-notempty="" data-bv-notempty-message="bla bla bla bla" placeholder="e.g. 20" data-bv-greaterthan="true" data-bv-greaterthan-value="10" data-bv-lessthan="true" data-bv-lessthan-value="51" data-bv-lessthan-message="bla bla" class="form-control" value="40" type="hidden">

Where it says Value="40"

I want when the page loads for Greasemonkey to turn that into Value="45"

But if it says Value="10", I want it to become Value="15"

And so on and so forth...

Can it be done? @TomTheCat @Gogol

TomTheCat · Jul 13, 2022

JavaScript:

window.addEventListener('load', (event) => {
    document.getElementById("some").value = parseInt(document.getElementById("some").value) + 5;
});

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
JavaScript:

document.getElementById("some").value = document.getElementById("some").value + 5;

Oh wow, okay you're onto something. Unfortunately instead of turning 40 into 45, it turns 40 into 405 :/

So it adds a 5 instead of "editing" the number there and increasing it by 5.

TomTheCat · Jul 13, 2022

Scorpion Ghost said:
Oh wow, okay you're onto something. Unfortunately instead of turning 40 into 45, it turns 40 into 405 :/

So it adds a 5 instead of "editing" the number there and increasing it by 5.

Edited the code.

Ashk881 · Jul 13, 2022

Scorpion Ghost said:
Oh wow, okay you're onto something. Unfortunately instead of turning 40 into 45, it turns 40 into 405 :/

So it adds a 5 instead of "editing" the number there and increasing it by 5.

That's cause js is stupid.
Do a parseInt(document.getElementbyId().value) + 5

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
Edited the code.

Now nothing happens. But maybe it's because I'm running it from the console instead of a proper GM script. Let me try a script...

Gogol · Jul 13, 2022

Ashk881 said:
That's cause js is stupid.
Do a parseInt(document.getElementbyId()) + 5

Cmon it’s not stupid hahah. It IS supposed to be a string, not an integer

TomTheCat · Jul 13, 2022

Scorpion Ghost said:
Now nothing happens. But maybe it's because I'm running it from the console instead of a proper GM script. Let me try a script...

Probably because of the load event.

Scorpion Ghost · Jul 13, 2022

Ashk881 said:
That's cause js is stupid.
Do a parseInt(document.getElementbyId().value) + 5

Oh?

So what would the code be then?

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
Probably because of the load event.

Yeah I think so. One sec doing a GM script...

Ashk881 · Jul 13, 2022

Gogol said:
Cmon it’s not stupid hahah. It IS supposed to be a string, not an integer

Okay that was a wrong situation to demonstrate it's stupidity.

Ashk881 · Jul 13, 2022

Scorpion Ghost said:
Oh?

So what would the code be then?

It's the same as @TomTheCat 's. They have edited it.

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
Probably because of the load event.

Nope, doesn't work.

The script is active on the page, and I even set it to fire every 3 seconds with setInterval, but nothing changes.

TomTheCat · Jul 13, 2022

Scorpion Ghost said:
Oh?

So what would the code be then?

It was a joke. JS can't recognize a plus sign between a string and integer, like PHP does.

Scorpion Ghost · Jul 13, 2022

No, doesn't work...

TomTheCat · Jul 13, 2022

Scorpion Ghost said:
No, doesn't work...

Check and see if the id on the page of that input is unique.

Here, works:

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
Check and see if the id on the page of that input is unique.

It is, but there are a few other IDs that start with the same word.

id="some"
id="someasd"
id="some-wqer"

TomTheCat · Jul 13, 2022

Scorpion Ghost said:
It is, but there are a few other IDs that start with the same word.

id="some"
id="someasd"
id="some-wqer"

It shouldn't be the issue. Is an exact match.

Try this code:

window. on load

JavaScript:

 = function () {
    document.getElementById("some").value = parseInt(document.getElementById("some").value) + 5;
}

Scorpion Ghost · Jul 13, 2022

TomTheCat said:
It shouldn't be the issue. Is an exact match.

Could the problem be that this code is "invisible"?

type="hidden"

Gogol · Jul 13, 2022

Gogol said:
Cmon it’s not stupid hahah. It IS supposed to be a string, not an integer

But to add to this… It is a bit stupid to allow an integer to be concatenated to a string. This is what typescript fixes, and I love typescript for the same.

Scorpion Ghost said:
Could the problem be that this code is "invisible"?

type="hidden"

Nopes. That should not be a problem. The problem is the event listener I think. Try console logging inside the listener and see whether it indeed fires like you expect it to.

Greasemonkey change value by 5

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