Column attribute support & Header row sort support

lib/backgrid.js

@@ -2152,7 +2152,11 @@ var HeaderCell = Backgrid.HeaderCell = Backbone.View.extend({
 
     this.$el.append(label);
     this.$el.addClass(column.get("name"));
+    this.$el.attr("data-columnname", column.get("name"));
     this.$el.addClass(column.get("direction"));
+    if (column.get("attributes")) {
+      this.$el.attr(column.get("attributes"));
+    }
     this.delegateEvents();
     return this;
   }
@@ -2221,7 +2225,18 @@ var Header = Backgrid.Header = Backbone.View.extend({
     if (!(this.columns instanceof Backbone.Collection)) {
       this.columns = new Columns(this.columns);
     }
+    this.createHeaderRow();
+
+    this.listenTo(this.columns, "sort", _.bind(function() {
+      this.createHeaderRow();
+      this.render();
+    }, this));
+  },
 
+  /**
+   Sets up a new headerRow and attaches it to the view
+   */
+  createHeaderRow: function() {
     this.row = new Backgrid.HeaderRow({
       columns: this.columns,
       collection: this.collection
@@ -2232,8 +2247,10 @@ var Header = Backgrid.Header = Backbone.View.extend({
      Renders this table head with a single row of header cells.
    */
   render: function () {
+    this.$el.empty();
     this.$el.append(this.row.render().$el);
     this.delegateEvents();
+    this.trigger("backgrid:header:rendered", this);
     return this;
   },
 

src/header.js

@@ -127,7 +127,11 @@ var HeaderCell = Backgrid.HeaderCell = Backbone.View.extend({
 
     this.$el.append(label);
     this.$el.addClass(column.get("name"));
+    this.$el.attr("data-columnname", column.get("name"));
     this.$el.addClass(column.get("direction"));
+    if (column.get("attributes")) {
+      this.$el.attr(column.get("attributes"));
+    }
     this.delegateEvents();
     return this;
   }
@@ -196,7 +200,18 @@ var Header = Backgrid.Header = Backbone.View.extend({
     if (!(this.columns instanceof Backbone.Collection)) {
       this.columns = new Columns(this.columns);
     }
+    this.createHeaderRow();
+
+    this.listenTo(this.columns, "sort", _.bind(function() {
+      this.createHeaderRow();
+      this.render();
+    }, this));
+  },
 
+  /**
+   Sets up a new headerRow and attaches it to the view
+   */
+  createHeaderRow: function() {
     this.row = new Backgrid.HeaderRow({
       columns: this.columns,
       collection: this.collection
@@ -207,8 +222,10 @@ var Header = Backgrid.Header = Backbone.View.extend({
      Renders this table head with a single row of header cells.
    */
   render: function () {
+    this.$el.empty();
     this.$el.append(this.row.render().$el);
     this.delegateEvents();
+    this.trigger("backgrid:header:rendered", this);
     return this;
   },
 

test/header.js

@@ -274,10 +274,16 @@ describe("A HeaderRow", function () {
     row = new Backgrid.HeaderRow({
       columns: [{
         name: "name",
-        cell: "string"
+        cell: "string",
+        attributes: {
+          colspan: "1"
+        }
       }, {
         name: "year",
-        cell: "integer"
+        cell: "integer",
+        attributes: {
+          colspan: "2"
+        }
       }],
       collection: books
     });
@@ -292,6 +298,8 @@ describe("A HeaderRow", function () {
     expect(th1.hasClass("sortable")).toBe(true);
     expect(th1.hasClass("renderable")).toBe(true);
     expect(th1.hasClass("name")).toBe(true);
+    expect(th1.data("columnname")).toBe("name");
+    expect(th1.attr("colspan")).toBe("1");
     expect(th1.find("a").text()).toBe("name");
     expect(th1.find("a").eq(1).is($("b", {className: "sort-caret"})));
 
@@ -300,6 +308,8 @@ describe("A HeaderRow", function () {
     expect(th2.hasClass("sortable")).toBe(true);
     expect(th2.hasClass("renderable")).toBe(true);
     expect(th2.hasClass("year")).toBe(true);
+    expect(th2.data("columnname")).toBe("year");
+    expect(th2.attr("colspan")).toBe("2");
     expect(th2.find("a").text()).toBe("year");
     expect(th2.find("a > b:last-child").eq(0).hasClass("sort-caret")).toBe(true);
   });
@@ -352,7 +362,6 @@ describe("A Header", function () {
   var head;
 
   beforeEach(function () {
-
     books = new Books([{
       title: "Alice's Adventures in Wonderland",
       year: 1865
@@ -363,6 +372,10 @@ describe("A Header", function () {
       title: "The Catcher in the Rye",
       year: 1951
     }]);
+  });
+
+  it("creates a header row on initialization", function() {
+    spyOn(Backgrid.Header.prototype, "createHeaderRow");
 
     head = new Backgrid.Header({
       columns: [{
@@ -374,11 +387,46 @@ describe("A Header", function () {
       }],
       collection: books
     });
+    expect(head.createHeaderRow.callCount).toEqual(1);
+  });
 
-    head.render();
+  it("renders again when sort is triggered on the column collection", function() {
+    head = new Backgrid.Header({
+      columns: [{
+        name: "name",
+        cell: "string"
+      }, {
+        name: "year",
+        cell: "integer"
+      }],
+      collection: books
+    });
+
+    spyOn(head, "createHeaderRow");
+    spyOn(head, "render");
+
+    head.columns.trigger("sort");
+
+    expect(head.createHeaderRow).toHaveBeenCalled();
+    expect(head.render).toHaveBeenCalled();
   });
 
   it("renders a header with a row of header cells", function () {
+    head = new Backgrid.Header({
+      columns: [{
+        name: "name",
+        cell: "string"
+      }, {
+        name: "year",
+        cell: "integer"
+      }],
+      collection: books
+    });
+
+    spyOn(head, "trigger");
+
+    head.render();
+
     expect(head.$el[0].tagName).toBe("THEAD");
 
     var th1 = $(head.row.el.childNodes[0]);
@@ -396,6 +444,9 @@ describe("A Header", function () {
     expect(th2.hasClass("year")).toBe(true);
     expect(th2.find("a").text()).toBe("year");
     expect(th2.find("a > b:last-child").eq(0).hasClass("sort-caret")).toBe(true);
+
+    expect(head.trigger.calls.length).toBe(1);
+    expect(head.trigger).toHaveBeenCalledWith("backgrid:header:rendered", head);
   });
 
 });