Add additional templates to control grid lines (#1874)

* Add ygrid template

* Add gridon template

* Fix typo

* Generate json template files

Author: joelostblom

Diff for: packages/python/plotly/plotly/io/_templates.py

@@ -42,6 +42,8 @@ def __init__(self):
             "plotly_dark",
             "presentation",
             "xgridoff",
+            "ygridoff",
+            "gridon",
             "none",
         ]
 

Diff for: packages/python/plotly/plotly/package_data/templates/gridon.json

@@ -0,0 +1 @@
+{"layout": {"xaxis": {"showgrid": true}, "yaxis": {"showgrid": true}}}

Diff for: packages/python/plotly/plotly/package_data/templates/ygridoff.json

@@ -0,0 +1 @@
+{"layout": {"yaxis": {"showgrid": false}}}

Diff for: packages/python/plotly/templategen/definitions.py

@@ -522,7 +522,7 @@ def presentation():
 
 def xgridoff():
     """
-    Tempalate to disable x-grid by default
+    Template to disable x-grid by default
     """
     # Create blank template
     template = Template()
@@ -532,3 +532,32 @@ def xgridoff():
 
 
 builders["xgridoff"] = xgridoff
+
+
+def ygridoff():
+    """
+    Template to disable y-grid by default
+    """
+    # Create blank template
+    template = Template()
+    template.layout.yaxis.showgrid = False
+
+    return template
+
+
+builders["ygridoff"] = ygridoff
+
+
+def gridon():
+    """
+    Template to enable x and y-grid by default
+    """
+    # Create blank template
+    template = Template()
+    template.layout.xaxis.showgrid = True
+    template.layout.yaxis.showgrid = True
+
+    return template
+
+
+builders["gridon"] = gridon