Table values may be left unspecified

src/traces/table/constants.js

@@ -9,26 +9,27 @@
 'use strict';
 
 module.exports = {
-    maxDimensionCount: 60,
-    overdrag: 45,
     cellPad: 8,
+    columnExtentOffset: 10,
+    columnTitleOffset: 28,
+    emptyHeaderHeight: 16,
     latexCheck: /^\$.*\$$/,
-    wrapSplitCharacter: ' ',
-    wrapSpacer: ' ',
-    lineBreaker: '<br>',
-    uplift: 5,
     goldenRatio: 1.618,
-    columnTitleOffset: 28,
-    columnExtentOffset: 10,
-    transitionEase: 'cubic-out',
-    transitionDuration: 100,
-    releaseTransitionEase: 'cubic-out',
+    lineBreaker: '<br>',
+    maxDimensionCount: 60,
+    overdrag: 45,
     releaseTransitionDuration: 120,
-    scrollbarWidth: 8,
+    releaseTransitionEase: 'cubic-out',
     scrollbarCaptureWidth: 18,
-    scrollbarOffset: 5,
     scrollbarHideDelay: 1000,
     scrollbarHideDuration: 1000,
+    scrollbarOffset: 5,
+    scrollbarWidth: 8,
+    transitionDuration: 100,
+    transitionEase: 'cubic-out',
+    uplift: 5,
+    wrapSpacer: ' ',
+    wrapSplitCharacter: ' ',
     cn: {
         // general class names
         table: 'table',

src/traces/table/data_preparation_helper.js

@@ -14,14 +14,17 @@ var isNumeric = require('fast-isnumeric');
 
 // pure functions, don't alter but passes on `gd` and parts of `trace` without deep copying
 module.exports = function calc(gd, trace) {
+    var cellsValues = trace.cells.values;
+    var slicer = function(a) {
+        return a.slice(trace.header.values.length, a.length);
+    };
     var headerValues = trace.header.values.map(function(c) {
         return Array.isArray(c) ? c : [c];
-    });
-    var cellsValues = trace.cells.values;
+    }).concat(slicer(cellsValues).map(function() {return [''];}));
     var domain = trace.domain;
     var groupWidth = Math.floor(gd._fullLayout._size.w * (domain.x[1] - domain.x[0]));
     var groupHeight = Math.floor(gd._fullLayout._size.h * (domain.y[1] - domain.y[0]));
-    var headerRowHeights = headerValues.length ? headerValues[0].map(function() {return trace.header.height;}) : [];
+    var headerRowHeights = trace.header.values.length ? headerValues[0].map(function() {return trace.header.height;}) : [c.emptyHeaderHeight];
     var rowHeights = cellsValues.length ? cellsValues[0].map(function() {return trace.cells.height;}) : [];
     var headerHeight = headerRowHeights.reduce(function(a, b) {return a + b;}, 0);
     var scrollHeight = groupHeight - headerHeight;
@@ -31,7 +34,7 @@ module.exports = function calc(gd, trace) {
     var headerRowBlocks = makeRowBlock(anchorToHeaderRowBlock, []);
     var rowBlocks = makeRowBlock(anchorToRowBlock, headerRowBlocks);
     var uniqueKeys = {};
-    var columnOrder = trace._fullInput.columnorder;
+    var columnOrder = trace._fullInput.columnorder.concat(slicer(cellsValues.map(function(d, i) {return i;})));
     var columnWidths = headerValues.map(function(d, i) {
         var value = Array.isArray(trace.columnwidth) ?
             trace.columnwidth[Math.min(i, trace.columnwidth.length - 1)] :

src/traces/table/data_split_helpers.js

@@ -51,7 +51,7 @@ exports.splitToPanels = function(d) {
 
 exports.splitToCells = function(d) {
     var fromTo = rowFromTo(d);
-    return d.values.slice(fromTo[0], fromTo[1]).map(function(v, i) {
+    return (d.values || []).slice(fromTo[0], fromTo[1]).map(function(v, i) {
         // By keeping identical key, a DOM node removal, creation and addition is spared, important when visible
         // grid has a lot of elements (quadratic with xcol/ycol count).
         // But it has to be busted when `svgUtil.convertToTspans` is used as it reshapes cell subtrees asynchronously,

test/jasmine/tests/table_test.js

@@ -206,6 +206,57 @@ describe('table', function() {
         });
     });
 
+    describe('Rendering with partial attribute support', function() {
+        var mockCopy,
+            gd;
+
+        afterEach(destroyGraphDiv);
+
+        it('`Plotly.plot` should render all the columns even if no cell contents were supplied yet', function(done) {
+            gd = createGraphDiv();
+            mockCopy = Lib.extendDeep({}, mock);
+            delete mockCopy.data[0].cells;
+            Plotly.plot(gd, mockCopy.data, mockCopy.layout).then(function() {
+                expect(gd.data.length).toEqual(1);
+                expect(gd.data[0].header.values.length).toEqual(7);
+                expect(document.querySelectorAll('.' + cn.yColumn).length).toEqual(7);
+                expect(document.querySelectorAll('.' + cn.columnCell).length).toEqual(7 * 2); // both column rows to render
+                done();
+            });
+        });
+
+        it('`Plotly.plot` should render all columns even if no header contents were supplied yet', function(done) {
+            gd = createGraphDiv();
+            mockCopy = Lib.extendDeep({}, mock);
+            delete mockCopy.data[0].header;
+            Plotly.plot(gd, mockCopy.data, mockCopy.layout).then(function() {
+                expect(gd.data.length).toEqual(1);
+                expect(gd.data[0].cells.values.length).toEqual(7);
+                expect(document.querySelectorAll('.' + cn.yColumn).length).toEqual(7);
+                expect(document.querySelectorAll('.' + cn.columnCell).length).toEqual(7 * 29);
+                expect(document.querySelectorAll('#header').length).toEqual(7);
+                expect(document.querySelectorAll('#header .' + cn.columnCell).length).toEqual(7);
+                expect(document.querySelector('#header .' + cn.columnCell + ' text').textContent).toEqual('');
+                done();
+            });
+        });
+
+        it('`Plotly.plot` should render all the column headers even if not all header values were supplied', function(done) {
+            gd = createGraphDiv();
+            mockCopy = Lib.extendDeep({}, mock);
+            mockCopy.data[0].header.values = ['A', 'S', 'D']; // doesn't cover all 7 columns
+            Plotly.plot(gd, mockCopy.data, mockCopy.layout).then(function() {
+                expect(gd.data.length).toEqual(1);
+                expect(gd.data[0].cells.values.length).toEqual(7);
+                expect(document.querySelectorAll('.' + cn.yColumn).length).toEqual(7);
+                expect(document.querySelectorAll('#header').length).toEqual(7);
+                expect(document.querySelectorAll('#header .' + cn.columnCell).length).toEqual(7);
+                expect(document.querySelector('#header .' + cn.columnCell + ' text').textContent).toEqual('A');
+                done();
+            });
+        });
+    });
+
     describe('basic use and basic data restyling', function() {
         var mockCopy,
             gd;