Creating zoom shortcut

[StarAG​]

How can I create a action or a key which can zoom out the document to a specific percentage (say 20%) whenever I press them?

[Nicky G.]

// Riduci lo zoom corrente del 20%

if (app.documents.length > 0) {
var doc = app.activeDocument;
var currentZoom = doc.views[0].zoom; // valore in scala (es. 1.0 = 100%)

var newZoom = currentZoom * 0.8; // riduci del 20%
doc.views[0].zoom = newZoom;

//alert("Zoom ridotto del 20%");
} else {
alert("Nessun documento aperto.");
}

[Ton Frederiks]

That zooms from 100 to 80% on my machine.

[Nicky G.]

And wasn't that the request? If you run the script 2 times it goes to 64% ....

[Ton Frederiks]

Maybe I misunderstood, but I think they ment to zoom to 20%.

[Kurt Gold]

In case you want to set an absolute zoom level, you can use this javascript snippet to always go to 20 %:

// Absolute Zoom level: 20 %
if (app.activeDocument) {
    app.activeDocument.views[0].zoom = 0.2;
}

You can incorporate it into an action and assign a keyboard shortcut to the action.

[Ton Frederiks]

That works as how I understood the question.