[FIX] web: JournalDashboardGraph: empty $el at rerendering

The '_render' function of field widgets can be called several
times in the widget's life cycle (each time its value changes).
The JournalDashboardGraph appends a new 'svg' to its the $el at
each rendering, so it must empty its $el at the beginning of each
rendering.

Before this fix, several graphs were displayed in the same kanban
card in the Sales dashboard when, e.g., the user changed the color
of the card.

1 files changed, 1 insertions, 0 deletions

diff --git a/addons/web/static/src/js/fields/basic_fields.js b/addons/web/static/src/js/fields/basic_fields.js
index 654d48db560..5a3bd699a7c 100644
--- a/addons/web/static/src/js/fields/basic_fields.js
+++ b/addons/web/static/src/js/fields/basic_fields.js
@@ -1701,6 +1701,7 @@ var JournalDashboardGraph = AbstractField.extend({
         // note: the rendering of this widget is aynchronous as nvd3 does a
         // setTimeout(0) before executing the callback given to addGraph
         var self = this;
+        this.$el.empty();
         this.chart = null;
         nv.addGraph(function () {
             self.$svg = self.$el.append('<svg>');