Class # WebChart --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- ## Description Displays data you provide in chart form of various types. ## Properties

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| Name | Type | Read-Only | Shared | |-----------------------------------------------------------|----------------------------------------------------|-----------|--------| | `AllowPopover` | `Boolean` | | | | `AutoCalculateYAxis` | `Boolean` | | | | `Backdrop` | `WebPicture` | | | | `ContextualMenu` | `WebMenuItem` | | | | `ControlID` | `String` | ✓ | | | `DatasetCount` | `Integer` | ✓ | | | `DatasetLastIndex` | `Integer` | ✓ | | | `Enabled` | `Boolean` | | | | `GridColor` | `ColorGroup` | | | | `HasAnimation` | `Boolean` | | | | `HasLegend` | `Boolean` | | | | `Height` | `Integer` | | | | `Indicator` | `Indicators` | | | | `IsGridVisible` | `Boolean` | | | | `IsYAxisVisible` | `Boolean` | | | | `IsXAxisVisible` | `Boolean` | | | | `LabelCount` | `Integer` | ✓ | | | `LabelLastIndex` | `Integer` | ✓ | | | `Left` | `Integer` | | | | `LegendColor` | `ColorGroup` | | | | `LegendFontName` | `String` | | | | `LegendFontSize` | `Double` | | | | `LockBottom` | `Boolean` | | | | `LockHorizontal` | `Boolean` | | | | `LockLeft` | `Boolean` | | | | `LockRight` | `Boolean` | | | | `LockTop` | `Boolean` | | | | `LockVertical` | `Boolean` | | | | `Mode` | `Modes` | | | | `Name` | `String` | ✓ | | | `Page` | `WebPage` | ✓ | | | `PanelIndex` | `Integer` | | | | `Parent` | `WebView` | ✓ | | | `PopoverBackgroundColor` | `ColorGroup` | | | | `TabIndex` | `Integer` | | | | `Title` | `String` | | | | `TitleColor` | `ColorGroup` | | | | `TitleFontName` | `String` | | | | `TitleFontSize` | `Double` | | | | `Tooltip` | `WebToolTip` | | | | `Top` | `Integer` | | | | `Visible` | `Boolean` | | | | `Width` | `Integer` | | | ## Methods

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| Name | Parameters | Returns | Shared | |-------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------|---------------------------------------------------------|--------| | `AcceptPictureDrop` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `AcceptRawDataDrop` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `AcceptTextDrop` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `AddDataset` | dataset As `ChartDataset` | | | | `AddDatasetAt` | index As `Integer`, Dataset As `ChartDataset` | | | | `AddDatasets` | datasets() As `ChartDataset` | | | | `AddLabel` | name As `String` | | | | `AddLabelAt` | index As `String`, name As `String` | | | | `AddLabels` | names() As `String` | | | | `AllowPictureDrag` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `AllowRawDataDrag` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `AllowTextDrag` | dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All` | | | | `Close` | | | | | `CSSClasses` | | `WebCSSClasses` | | | `DatasetAt` | index As `Integer` | `ChartDataset` | | | `Datasets` | | `Iterable` | | | `ExecuteJavaScript` | script As `String` | | | | `GotoURL` | url As `String`, inNewWindow As `Boolean` = `False` | | | | `LabelAt` | index As `Integer` | `String` | | | `Labels` | | `Iterable` | | | `RemoveAllDatasets` | | | | | `RemoveAllLabels` | | | | | `RemoveDatasetAt` | index As `Integer` | | | | `RemoveLabelAt` | index As `Integer` | | | | `SetFocus` | | | | | `Style` | | `WebStyle` | | | | `Assigns` style As `WebStyle` | | | | `ToPicture` | width As `Double` = -1, height As `Double` = -1 | | | | `UpdateBrowser` | | | | ## Events

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| Name | Parameters | Returns | |-----------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------| | `Closed` | | | | `ContextualMenuSelected` | hitItem As `WebMenuItem` | | | `DropObject` | obj As `WebDragItem`, action As `WebDragItem.DragActionTypes`, x As `Integer`, y As `Integer` | | | `Hidden` | | | | `Opening` | | | | `OverrideOptions` | options As `JSONItem` | | | `Pressed` | dataset As `ChartData`, index As `Integer` | | | `RequestedPicture` | chart As `Picture` | | | `Shown` | | | ## Enumerations

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WebChart.Modes ### Modes > The various types of charts available. > > | Enum | > |-----------| > | Bar | > | Bubble | > | Doughnut | > | Line | > | Pie | > | PolarArea | > | Radar | > | Scatter | > | Stacked | ## Property descriptions

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WebChart.AllowPopover **AllowPopover** As `Boolean` > If `True`, a popover will be displayed when the user positions the mouse over items that have additional information. > > The default value is `True`.

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WebChart.AutoCalculateYAxis **AutoCalculateYAxis** As `Boolean` > If `False`, the Y axis for Line and Bar charts will start at 0. > > This property is `True` by default.

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WebChart.Backdrop **Backdrop** As `WebPicture` > The passed `WebPicture` that will automatically be drawn behind the chart data. > > The following code assigns a jpg image to the Backdrop. The image has been added to the project. The code is in the Opening event. > > ``` xojo > Me.BackDrop = HouseImage > ```

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WebChart.ContextualMenu **ContextualMenu** As `WebMenuItem` > If you assign a `WebMenuItem` to the control, it will be displayed when the user right-clicks the control. > > On a `WebPage`, you can disable/remove the default contextual menu by an empty `WebMenuItem` class object to this property. > > This code populates a contextual menu in the Shown event of the control. > > ``` xojo > Var menu As New WebMenuItem > > menu.AddMenuItem("One") > menu.AddMenuItem("Two") > menu.AddMenuItem("Three") > Me.ContextualMenu = menu > ``` > > The menu selection is then handled by the ContextualMenuSelected event when the user right-clicks on the control. For example, it can be of the form: > > ``` xojo > Select Case hitItem.Text > Case "One" > MessageBox("One") > Case "Two" > MessageBox("Two") > Case "Three" > MessageBox("Three") > End Select > ```

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WebChart.ControlID **ControlID** As `String` > Identifies the control on a per session basis. > > This property is read-only.

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WebChart.DatasetCount **DatasetCount** As `Integer` > The number of datasets that have been added to the chart. > > This property is read-only.

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WebChart.DatasetLastIndex **DatasetLastIndex** As `Integer` > The index of last dataset added to the chart. > > This property is read-only.

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WebChart.Enabled **Enabled** As `Boolean` > When `True` the **WebControl** is drawn enabled and responds to user action. When `False`, the control appears as disabled and does not respond to user actions. > > In the case of `WebTimer`, when set to `False` this disables and stops the WebTimer. When set to `True`, it starts the WebTimer. > > Disable a button when a check box value changes: > > ``` xojo > If AllowSaveCheckBox.Value Then > SaveButton.Enabled = True > Else > AllowSaveButton.Enabled = False > End If > ```

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WebChart.GridColor **GridColor** As `ColorGroup` > The color of the chart's grid.

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WebChart.HasAnimation **HasAnimation** As `Boolean` > If `True`, changes to chart data will result in animated updates to the chart.

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WebChart.HasLegend **HasLegend** As `Boolean` > If `True`, the chart's legend will be displayed.

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WebChart.Height **Height** As `Integer` > The height (in pixels) of the control.

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WebChart.Indicator **Indicator** As `Indicators` > The color scheme for the control.

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WebChart.IsGridVisible **IsGridVisible** As `Boolean` > Determines if the grid will be drawn or not.

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WebChart.IsYAxisVisible **IsYAxisVisible** As `Boolean` > Determines if the Y axis will be drawn or not.

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WebChart.IsXAxisVisible **IsXAxisVisible** As `Boolean` > Determines if the X axis will be drawn or not.

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WebChart.LabelCount **LabelCount** As `Integer` > The number of labels in the chart. > > This property is read-only.

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WebChart.LabelLastIndex **LabelLastIndex** As `Integer` > The index of last label added to the chart. > > This property is read-only.

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WebChart.Left **Left** As `Integer` > The position of the left side of the **WebUIControl** in pixels, relative to the web page.

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WebChart.LegendColor **TextColor** As `ColorGroup` > Gets or sets the color of the legend. The default value is black. > > The following example sets the LegendColor. > > ``` xojo > Me.LegendColor = Color.Red > ```

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WebChart.LegendFontName **TitleFontName** As `String` > Name of the font used to display the chart legend. > > You can enter any font that is installed in the browser. > >

> >

> > Tip > >

> > You can `install fonts from Google` as well. > >

> > This code sets the FontName property. > > ``` xojo > Me.LegendFontName = "Helvetica" > ```

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WebChart.LegendFontSize **LegendFontSize** As `Double` > Point size of the font used to display the legend. > > If you enter zero as the FontSize, your app will use the font size that works best for the platform on which it is running. > > This code sets the font size to 16 points. > > ``` xojo > Me.LegendFontSize = 16 > ```

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WebChart.LockBottom **LockBottom** As `Boolean` > Determines whether the bottom edge of the control should stay at a set distance from the bottom edge of the parent control, if there is one, or the owning web page.

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WebChart.LockHorizontal **LockHorizontal** As `Boolean` > LockHorizontal overrides LockLeft and LockRight. It allows you to proportionally lock a control's position to the center of its parent control (or web page). > > For example, if you place a control in the center of the page and sets both LockHorizontal and LockVertical, the control will stay in the center of the page.

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WebChart.LockLeft **LockLeft** As `Boolean` > Determines whether the left edge of the control should stay at a set distance from the left edge of the parent control, if there is one, or the owning web page.

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WebChart.LockRight **LockRight** As `Boolean` > Determines whether the right edge of the control should stay at a set distance from the right edge of the parent control, if there is one, or the owning web page.

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WebChart.LockTop **LockTop** As `Boolean` > Determines whether the top edge of the control should stay at a set distance from the top edge of the parent control, if there is one, or the owning web page.

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WebChart.LockVertical **LockVertical** As `Boolean` > LockVertical overrides LockTop and LockBottom. It allows you to proportionally lock a control's position to keep it centered within the parent control or web page. > > For example, if you place a control in the center of the page, and sets both LockHorizontal and LockVertical, the control will stay in the center of the page.

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WebChart.Mode **Mode** As `Modes` > Indicates the type of chart the control is currently displaying. > > Labels are required for a Bar chart to draw. > > This example checks the mode of the chart: > > ``` xojo > If Chart1.Mode = WebChart.Modes.Bar then > Chart1.Title = "Sales Bar Chart" > End If > ```

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WebChart.Name **Name** As `String` > The name of the control. > > This property is read-only.

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WebChart.Page **Page** As `WebPage` > Identifies the web page that contains the control. > > This property is read-only.

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WebChart.PanelIndex **PanelIndex** As `Integer` > If the control has been placed on a WebTabPanel or `WebPagePanel` control, this is the panel (page/tab) that the control is on. If the control is not on a panel, it returns -1. > > The first panel is numbered zero. If the control has been placed on a panel of a WebTabPanel or `WebPagePanel` control, it returns the panel number. If the control is not on a `WebPagePanel` or WebTabPanel, it returns -1. If you change the PanelIndex to a nonexistent panel, the control will disappear until you give it a PanelIndex value that corresponds to a panel that exists. > > If you are looking to change the currently selected panel (page/tab), use `SelectedPanelIndex`. > > This code displays the panel index of the control that is on the page. > > ``` xojo > MessageBox(Me.SelectedPanelIndex.ToString) > ```

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WebChart.Parent **Parent** As `WebView` > Used to get the control's parent control or page. If the parent control is a `WebContainer`, then it returns the `WebContainer`. If it is on a `WebPage`, it returns the `WebPage`. > > This property is read-only.

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WebChart.PopoverBackgroundColor **PopoverBackgroundColor** As `ColorGroup` > The background color of the chart's popover.

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WebChart.TabIndex **TabIndex** As `Integer` > The **WebChart's** control's position in the Tab Order. The control with a TabIndex of 0 is the first **WebUIControl** to get the focus when the page opens in the browser. > > This example sets the control's TabIndex. > > ``` xojo > Me.TabIndex = 2 > ```

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WebChart.Title **Title** As `String` > The title of the chart.

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WebChart.TitleColor **TitleColor** As `ColorGroup` > Gets or sets the color of the title. The default value is black. > > The following example sets the TitleColor. > > ``` xojo > Me.TitleColor = Color.Red > ```

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WebChart.TitleFontName **TitleFontName** As `String` > Name of the font used to display the chart title. > > You can enter any font that is installed in the browser. > >

> >

> > Tip > >

> > You can `install fonts from Google` as well. > >

> > This code sets the TitleFontName property. > > ``` xojo > Me.TitleFontName = "Helvetica" > ```

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WebChart.TitleFontSize **TitleFontSize** As `Double` > Point size of the font used to display the title. > > If you enter zero as the FontSize, your app will use the font size that works best for the platform on which it is running. > > This code sets the font size to 16 points. > > ``` xojo > Me.TitleFontSize = 16 > ```

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WebChart.Tooltip **Tooltip** As `WebToolTip` > Text of a message displayed as a tooltip. > > The tip is displayed when the user places the mouse on the control and leaves it there. > > This code in the Shown event of a Button sets the tooltip: > > ``` xojo > Me.Tooltip = "Save changes" > ```

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WebChart.Top **Top** As `Integer` > The top of the control in local coordinates relative to the web page.

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WebChart.Visible **Visible** As `Boolean` > If `True`, the control is drawn. If `False`, it's not. > > Hide a control based on a checkbox setting: > > ``` xojo > If ShowEmailCheckbox.Value Then > EmailField.Visible = True > Else > EmailField.Visible = False > End If > ```

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WebChart.Width **Width** As `Integer` > The width (in pixels) of the web control. > > This code in the Shown event handler increases the size of the control: > > ``` xojo > Me.Width = Me.Width + 50 > ``` ## Method descriptions

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WebChart.AcceptPictureDrop **AcceptPictureDrop**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to accept a picture drop of a `WebDragItem`.

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WebChart.AcceptRawDataDrop **AcceptRawDataDrop**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to accept a raw data drop of a `WebDragItem`.

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WebChart.AcceptTextDrop **AcceptTextDrop**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to accept a picture drop of a `WebDragItem`.

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WebChart.AddDataset **AddDataset**(dataset As `ChartDataset`) > Adds the dataset to the chart. Incompatible datasets are ignored.

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WebChart.AddDatasetAt **AddDatasetAt**(index As `Integer`, dataset As `ChartDataset`) > Adds the dataset to the chart at the index passed. Incompatible datasets are ignored.

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WebChart.AddDatasets **AddDatasets**(datasets() As `ChartDataset`) > Adds the array of datasets to the chart.

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WebChart.AddLabel **AddLabel**(name As `String`) > Adds the label to the chart.

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WebChart.AddLabelAt **AddLabelAt**(index As `String`, name As `String`) > Adds the label to the chart at the index passed.

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WebChart.AddLabels **AddLabels**(names() As `String`) > Adds the array of labels to the chart.

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WebChart.AllowPictureDrag **AllowPictureDrag**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to be dragged as a picture.

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WebChart.AllowRawDataDrag **AllowRawDataDrag**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to be dragged as raw data.

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WebChart.AllowTextDrag **AllowTextDrag**(dragActionType As `WebDragItem.DragActionTypes` = `WebDragItem.DragActionTypes.All`) > Allows the control to be dragged as text.

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WebChart.Close **Close** > Closes the chart.

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WebChart.CSSClasses **CSSClasses** > Returns the instance of `WebCSSClasses` for this control allowing you to add CSS classes to and remove CSS classes from the control.

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WebChart.DatasetAt **DatasetAt**(index As `Integer`) As `ChartDataset` > Returns the `ChartDataset` at the index passed.

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WebChart.Datasets **Datasets**() As `Iterable` > Allows iterating through all data sets.

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WebChart.ExecuteJavaScript **ExecuteJavaScript**(script As `String`) > Executes the JavaScript passed. The JavaScript passed can call a JavaScript function in a WebPageSource control. > > The Xojo web framework uses EcmaScript 6 which is more strict than previous versions of JavaScript. For more details, see the [EcmaScript 6 documentation](https://www.ecma-international.org/ecma-262/6.0/). > > This code in the Pressed event of a Button displays an alert using JavaScript: > > ``` xojo > Me.ExecuteJavaScript("alert('Hello!');") > ``` > > This code will select the text in a WebTextField (or WebTextArea): > > ``` xojo > WebTextField1.ExecuteJavascript("document.getElementById('" + _ > WebTextField1.ControlID + "_inner').select();") > ```

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WebChart.GotoURL **GotoURL**(url As `String`, inNewWindow As `Boolean` = `False`) > Opens the passed *url* in place of the current web page or downloads a file. If *inNewWindow* is `True`, the browser is asked to open the *url* in a new window. > > If the browser has popup windows disabled and *inNewWindow* is `True`, the method silently fails and the page is not shown. > > If *inNewWindow* is `False`, the running web app is replaced with the specified *url*. If you want to display an external web site within your web app, use the `WebHTMLViewer` control. > > Display a web site in a new popup window: > > ``` xojo > Me.GotoURL("http://www.wikipedia.org", True) > ```

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WebChart.LabelAt **LabelAt**(index As `Integer`) As `String` > Returns the label at the index passed.

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WebChart.Labels **Labels**() As `Iterable` > Allows iterating through all labels.

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WebChart.RemoveAllDatasets **RemoveAllDatasets** > Removes all datasets from the chart.

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WebChart.RemoveAllLabels **RemoveAllLabels** > Removes all labels from the chart.

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WebChart.RemoveDatasetAt **RemoveDatasetAt**(index As `Integer`) > Removes the `ChartDataset` at the index passed.

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WebChart.RemoveLabelAt **RemoveLabelAt**(index As `Integer`) > Removes the label at the index passed.

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WebChart.SetFocus **SetFocus** > Sets the focus to the `Control`. > > This code checks for a required value when a button is pressed: > > ``` xojo > If UserNameField.Text.IsEmpty Then > MessageBox("Please enter your UserName.") > UserNameField.SetFocus > Return > End If > ```

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WebChart.Style **Style** As `WebStyle` > Returns the `WebStyle` for the control. --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- **Style**(`Assigns` style As `WebStyle`) > Assigns the *style* to the control. > > In this example, in any event of the control, set the text to bold: > > ``` xojo > Var style As New WebStyle > style.Bold = True > Me.Style = style > ```

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WebChart.ToPicture **ToPicture**(width As `Double` = -1, height As `Double` = -1) > Creates a `Picture` from the the chart at the size specified by the *width* and *height* parameters. If these parameters are not specified, the `Picture` is created using the dimensions of the chart. The `Picture` is returned via the `RequestedPicture` event.

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WebChart.UpdateBrowser **UpdateBrowser** > Forces the current values of the control to be sent to the browser. > > This method is useful when you are computing values in a loop and wish to update the browser immediately rather than wait until the current method ends. > > This code iterates through a `RowSet` of `database rows`, updates a `ProgressBar` and then forces the updated `ProgressBar` to be sent to the browser via UpdateBrowser. > > ``` xojo > ProgressBar1.MaximumValue = SalesData.RowCount > For Each row As DatabaseRow in SalesData > AnalyzeSales(row) > ProgressBar1.Value = ProgressBar1.Value + 1 > ProgressBar1.UpdateBrowser > Next > ``` ## Event descriptions

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WebChart.Closed **Closed** > The control has been removed from the browser either because the page has closed or the control's Close method was called.

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WebChart.ContextualMenuSelected **ContextualMenuSelected**(hitItem As `WebMenuItem`) > Called when a contextual menu item is selected. This selected item is contained in *hitItem*. > > This code populates a contextual menu in the Opening event of a `WebToolbar`: > > ``` xojo > Var menu As New WebMenuItem > > menu.AddMenuItem("One") > menu.AddMenuItem("Two") > menu.AddMenuItem("Three") > Me.ContextualMenu = menu > ``` > > The menu selection is then handled by the ContextualMenuSelected event when the user right-clicks on the control. For example, it can be of the form: > > ``` xojo > Select Case hitItem.Text > Case "One" > MessageBox("One") > Case "Two" > MessageBox("Two") > Case "Three" > MessageBox("Three") > End Select > ```

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WebChart.DropObject **DropObject**(obj As `WebDragItem`, action As `WebDragItem.DragActionTypes`, x As `Integer`, y As `Integer`) > Called when a dragged item is over a control that can accept it. The dragged item is contained in *obj* and the type of drag is identified by *action*.

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WebChart.Hidden **Hidden** > The control is about to become no longer visible. This could be because the page is being closed, is being replaced as the foreground page by another page or because the control or a parent control's Visible property has been set to `False`.

Note

This event is equivalent to the `DesktopWindow.Deactivated` event in a desktop app.

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WebChart.Opening **Opening** > The control has been created and the page is opening but has not been sent to the browser yet. > > The Opening event handler can be used to initialize non-visual properties and settings for controls. > > In most cases, you should use the `Shown` event to initialize controls.

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WebChart.OverrideOptions **OverrideOptions**(options As `JSONItem`) > Allows you to override the built-in features of WebChart by modifying the Options parameter passed. > > WebChart is based upon [ChartJS](https://www.chartjs.org). See the [ChartJS](https://www.chartjs.org) website for details on the format of the data in the Options parameter.

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WebChart.Pressed **Pressed**(dataset As `ChartData`, index As `Integer`) > The user pressed on a part of the chart that represents data from the *dataset*.

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WebChart.RequestedPicture **RequestedPicture**(chart As `Picture`) > This event is called when the `ToPicture` method and is passed a `Picture` representing the chart.

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WebChart.Shown **Shown** > The control has appeared on the currently displayed page. This could be because its parent page just finished loading, its parent page has come to the foreground or the control is now visible having been previously invisible because it or its parent control's Visible property has been set to `True`. > > Use the Shown event for initializing your controls or doing anything that would interact with other controls or user interface elements on the web page instead of the `Opening` event. > >

> >

> > Note > >

> > This event is the web equivalent to the `DesktopWindow.Activated` event. > >

> > This code in the Shown event of a `WebListBox` adds 2 rows with 3 columns: > > ``` xojo > Me.RemoveAllRows > Me.AddRow("Row 1", "Bob", "Roberts") > Me.AddRow("Row 2", "Barb", "Reynolds") > ``` > > This example sets the text of a label: > > ``` xojo > If Session.LoggedIn Then > Me.Text = "Welcome!" > Else > Me.Text = "Welcome, " + Session.UserName > End If > ``` ## Notes If you wish to set the background color of the chart, do so via the `Style` property. ## Compatibility | | | |-----------------------|-----| | **Project Types** | Web | | **Operating Systems** | All |

`WebUIControl` parent class; `ChartCircularDataset`, `ChartDataset`, `ChartLinearDataset`, `ChartScatterDataset` and `ChartScatterDatapoint` classes.