ArcGIS API for JavaScript 4.x - Zoom to Previous Extent and Zoom to Next Extent Supported?

ipeebles

Hello everyone.  Working on updating some applications from the JS API 3.x environment to the JS API 4.x environment.

I am looking to add in a button for a Zoom to Previous Extent and a button for Zoom to Next Extent.  I am looking at the API reference, but do not find anything.

Is there anything in JS API 4.x that is like this?

zoomToNextExtent()

zoomToPrevExtent()

I am looking, but not finding anything.

JeffreyWilkerson

I don't know if there will ever be the same functions as in 3.X, but I implemented the same (at least the previous extents) using a little code.

// Add a variable somewhere before it all happens
let prevPoint = [];

// You probably already have a 'view.when' section, add the 'view.watch' to
//  look for changes to the extent and store those in the prevPoint list.
view.when(function () {
	// Setup listener for the extent change, then populate the previous point using its center
	view.watch("extent", function (newValue, oldValue) {
		let dTest = Math.abs(newValue.xmax - newValue.xmin);
		let dFactor = dTest / 100;  // Need to leave any small movements behind, but these depend on scale.
		if (Math.abs(newValue.xmax - oldValue.xmax) > dFactor ||
			Math.abs(newValue.xmin - oldValue.xmin) > dFactor ||
			Math.abs(newValue.ymax - oldValue.ymax) > dFactor ||
			Math.abs(newValue.ymin - oldValue.ymin) > dFactor) {
			prevPoint.push(newValue);
		}
		if (prevPoint.length > 40) { prevPoint.shift(); //stored }
	});
});

// Previous button functionality (zoom to previous)
let btnPrevExtent = dom.byId("btnPrevExtent");
on(btnPrevExtent, "click", function () {
	zoomPrevious();
})

function zoomPrevious() {
	if (prevPoint.length > 1) {
		prevPoint.pop();
		let lastEx = prevPoint[prevPoint.length - 1];
		prevPoint.pop();
		view.extent = lastEx;
	}
}

Could probably be made more concise but you get the idea.