Fixing issue #5350 by moving the 'false' check

draftlogs/6727_fix.md

@@ -0,0 +1 @@
+ - Addressing issue [[#5350](https://github.com/plotly/plotly.js/issues/5350)] via pull request [[#6727](https://github.com/plotly/plotly.js/pull/6727)]. This small change allows custom plotly_legenddoubleclick handlers to execute even when the default plotly_legendclick event is cancelled (returns false).

src/components/legend/draw.js

@@ -464,11 +464,9 @@ function clickOrDoubleClick(gd, legend, legendItem, numClicks, evt) {
     if(Registry.traceIs(trace, 'pie-like')) {
         evtData.label = legendItem.datum()[0].label;
     }
-
     var clickVal = Events.triggerHandler(gd, 'plotly_legendclick', evtData);
-    if(clickVal === false) return;
-
     if(numClicks === 1) {
+        if(clickVal === false) return;
         legend._clickTimeout = setTimeout(function() {
             if(!gd._fullLayout) return;
             handleClick(legendItem, gd, numClicks);
@@ -478,7 +476,8 @@ function clickOrDoubleClick(gd, legend, legendItem, numClicks, evt) {
         gd._legendMouseDownTime = 0;
 
         var dblClickVal = Events.triggerHandler(gd, 'plotly_legenddoubleclick', evtData);
-        if(dblClickVal !== false) handleClick(legendItem, gd, numClicks);
+        // Activate default double click behaviour only when both single click and double click values are not false
+        if(dblClickVal !== false && clickVal !== false) handleClick(legendItem, gd, numClicks);
     }
 }
 

test/jasmine/tests/legend_test.js

@@ -2742,6 +2742,38 @@ describe('legend with custom doubleClickDelay', function() {
         .then(_assert('[short] after click + (1.1*t) delay + click', 2, 0))
         .then(done, done.fail);
     }, 3 * jasmine.DEFAULT_TIMEOUT_INTERVAL);
+
+    it('custom plotly_legenddoubleclick handler should fire even when plotly_legendclick has been cancelled', function(done) {
+        var tShort = 0.75 * DBLCLICKDELAY;
+        var dblClickCnt = 0;
+        var newPlot = function(fig) {
+            return Plotly.newPlot(gd, fig).then(function() {
+                gd.on('plotly_legendclick', function() { return false; });
+                gd.on('plotly_legenddoubleclick', function() { dblClickCnt++; });
+            });
+        };
+
+        function _assert(msg, _dblClickCnt) {
+            return function() {
+                expect(dblClickCnt).toBe(_dblClickCnt, msg + '| dblClickCnt');
+                dblClickCnt = 0;
+            };
+        }
+
+        newPlot({
+            data: [
+                {y: [1, 2, 1]},
+                {y: [2, 1, 2]}
+            ],
+            layout: {},
+            config: {}
+        })
+        .then(click(0))
+        .then(delay(tShort))
+        .then(click(0))
+        .then(_assert('Double click increases count', 1))
+        .then(done);
+    }, 3 * jasmine.DEFAULT_TIMEOUT_INTERVAL);
 });
 
 describe('legend with custom legendwidth', function() {