Add tooltip support

anserv/templates/grade_distribution/student_grade_distribution.html

@@ -27,11 +27,13 @@ function render{{graph_name}}()
                 hoverable: true
             },
             xaxis: {
+                mode: null,
                 axisLabel: "{{x_label}}",
                 min: {{x_min}},
                 max: {{x_max}}
             },
             yaxis: {
+                mode: null,
                 axisLabel: "{{y_label}}"
             },
             series: {
@@ -42,7 +44,7 @@ function render{{graph_name}}()
                     fill: true
                 }
             },
-            tooltip: false,
+            tooltip: true,
             tooltipOpts: {
                 content: "Score: %x  Count: %y",
                 shifts: {

css_js_src/js/jquery.flot.tooltip.js

@@ -190,7 +190,7 @@
 
     // helpers just for readability
     FlotTooltip.prototype.isTimeMode = function(axisName, item) {
-        return (typeof item.series[axisName].options.mode !== 'undefined' && item.series[axisName].options.mode === 'time');
+        return false;
     };
 
     FlotTooltip.prototype.isXDateFormat = function(item) {