add safe-guard in dragbox.js

etpinard · etpinard · commit 70b10fff46ee · 2019-02-18T12:59:49.000-05:00
diff --git a/src/plots/cartesian/dragbox.js b/src/plots/cartesian/dragbox.js
@@ -989,7 +989,7 @@ function zoomAxRanges(axList, r0Fraction, r1Fraction, updates, linkedAxes) {
     }
 
     // zoom linked axes about their centers
-    if(linkedAxes.length) {
+    if(linkedAxes && linkedAxes.length) {
         var linkedR0Fraction = (r0Fraction + (1 - r1Fraction)) / 2;
         zoomAxRanges(linkedAxes, linkedR0Fraction, 1 - linkedR0Fraction, updates, [], []);
     }

Original file line number	Diff line number	Diff line change
`@@ -989,7 +989,7 @@ function zoomAxRanges(axList, r0Fraction, r1Fraction, updates, linkedAxes) {`
`989`	`989`	`}`
`990`	`990`
`991`	`991`	`// zoom linked axes about their centers`
`992`		`- if(linkedAxes.length) {`
	`992`	`+ if(linkedAxes && linkedAxes.length) {`
`993`	`993`	`var linkedR0Fraction = (r0Fraction + (1 - r1Fraction)) / 2;`
`994`	`994`	`zoomAxRanges(linkedAxes, linkedR0Fraction, 1 - linkedR0Fraction, updates, [], []);`
`995`	`995`	`}`