Class

WebView

Description

The super class for all other classes that can contain objects. WebPage, WebDialog, WebContainer, WebRectangle, WebPagePanel and WebTabPanel are all WebViews.

Events

Name

Parameters

Returns

Closed

ContextualMenuSelected

hitItem As WebMenuItem

Hidden

Opening

Overflowed

width As Integer, height As Integer

Resized

Shown

Enumerations

WebView.LayoutDirections

LayoutDirections

The various directions in which WebContainerControls can wrap when added at runtime to a WebView whose LayoutType is set to Flex.

Enum

Description

BottomToTop

The containers will be laid out starting in the bottom-left corner with each new one above the previous until no more will fit. Subsequent columns will be added to the right of the previous one.

LeftToRight

The containers will be laid out starting in the top-left corner with each new one to the right of the previous until no more will fit. Subsequent rows will be added to below the previous one.

RightToLeft

The containers will be laid out starting in the top-right corner with each new one to the left of the previous until no more will fit. Subsequent rows will be added to below the previous one.

TopToBottom

The containers will be laid out starting in the top-left corner with each new one below the previous until no more will fit. Subsequent columns will be added to the right of the previous one.

WebView.LayoutTypes

LayoutTypes

The types of layouts for a WebView (Fixed or Flow).

Enum

Description

Fixed

The position is based upon the Left and Top properties of the WebContainer.

Flex

The position is based upon both the order in which the WebContainer was added and the layout's LayoutDirection.

Property descriptions

WebView.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.

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:

Select Case hitItem.Text
Case "One"
  MessageBox("One")
Case "Two"
  MessageBox("Two")
Case "Three"
  MessageBox("Three")
End Select

WebView.ControlCount

ControlCount As Integer

The number of controls on the WebContainer, WebDialog or WebPage.

This property is read-only.

WebView.ControlID

ControlID As String

Identifies the control on a per session basis.

This property is read-only.

WebView.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:

If AllowSaveCheckBox.Value Then
  SaveButton.Enabled = True
Else
  AllowSaveButton.Enabled = False
End If

WebView.Height

Height As Integer

The height (in pixels) of the control.

WebView.Indicator

Indicator As WebUIControl.Indicators

The color scheme for the control.

WebView.LayoutDirection

LayoutDirection As LayoutDirections

The direction in which WebContainer controls will flow when added at runtime to a layout whose LayoutType is set to Flex.

WebView.LayoutType

LayoutType As LayoutTypes

The type of layout dictates whether controls are positioned at fixed locations or can move to accommodate changes to the bounds of the WebView, in the latter case, only for WebContainer controls that are added at runtime to a layout whose type is set to Flex.

WebView.Left

Left As Integer

The position of the left side of the WebUIControl in pixels, relative to the web page.

WebView.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.

WebView.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.

WebView.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.

WebView.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.

WebView.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.

WebView.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.

WebView.Name

Name As String

The name of the control.

This property is read-only.

WebView.Page

Page As WebPage

Identifies the web page that contains the control.

This property is read-only.

WebView.Parent

Parent As WebControl

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.

WebView.TabIndex

TabIndex As Integer

The WebUIControl'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.

Me.TabIndex = 2

WebView.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:

Me.Tooltip = "Save changes"

WebView.Top

Top As Integer

The top of the control in local coordinates relative to the web page.

WebView.Visible

Visible As Boolean

If True, the control is drawn. If False, it's not.

Hide a control based on a checkbox setting:

If ShowEmailCheckbox.Value Then
  EmailField.Visible = True
Else
  EmailField.Visible = False
End If

WebView.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:

Me.Width = Me.Width + 50

Method descriptions

WebView.AddControl

AddControl(child As WebControl)

Adds the passed Control to the WebView.

This code adds a WebTextField to the page:

Var tf As New WebTextField
tf.Left = 100
tf.Top = 50
tf.Enabled = True
Self.AddControl(tf)

WebView.Close

Close

Removes the control from the page.

WebView.ControlAt

ControlAt(index As Integer) As WebControl

Returns the WebControl at the index passed.

WebView.Controls

Controls As Iterable

Allows you to iterate through the controls on the layout.

Note

This does not include non-control object instances. For that, use the Objects method.

This example counts the number of controls on the current page by iterating through them.

Var count As Integer
For Each cntrl As WebUIControl In Self.Controls
  count = count + 1
Next
MessageBox("This page has " + count.ToString + " controls.")

This example clears all checkboxes on the page:

For Each cntrl As WebUIControl In Self.Controls
  If cntrl IsA WebCheckBox Then WebCheckBox(cntrl).Value = False
Next

WebView.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.

This code in the Pressed event of a Button displays an alert using JavaScript:

Me.ExecuteJavaScript("alert('Hello!');")

This code will select the text in a WebTextField (or WebTextArea):

WebTextField1.ExecuteJavascript("document.getElementById('" + _
  WebTextField1.ControlID + "_inner').select();")

WebView.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:

Me.GotoURL("http://www.wikipedia.org", True)

WebView.LastControlIndex

LastControlIndex As Integer

The index of the last WebControl on the WebView.

WebView.Objects

Objects As Iterable

Allows you to iterate through all the non-control object instances on the WebPage, WebContainer or WebDialog.

Note

This does not include controls. For that, use the Controls method.

WebView.RemoveControl

RemoveControl(control As WebUIControl)

Removes the control from the WebView.

WebView.SetFocus

SetFocus

Sets the focus to the Control.

This code checks for a required value when a button is pressed:

If UserNameField.Text.IsEmpty Then
  MessageBox("Please enter your UserName.")
  UserNameField.SetFocus
  Return
End If

WebView.Style

Style As WebStyle

Returns the WebStyle for the webview.

Style(Assigns style As WebStyle)

Assigns the style to the webview.

In this example, in any event of the webview, set the text to bold:

Var style As New WebStyle
style.Bold = True
Me.Style = style

WebView.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.

ProgressBar1.MaximumValue = SalesData.RowCount
For Each row As DatabaseRow in SalesData
 AnalyzeSales(row)
 ProgressBar1.Value = ProgressBar1.Value + 1
 ProgressBar1.UpdateBrowser
Next

Event descriptions

WebView.Closed

Closed

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

WebView.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:

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:

Select Case hitItem.Text
Case "One"
  MessageBox("One")
Case "Two"
  MessageBox("Two")
Case "Three"
  MessageBox("Three")
End Select

WebView.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.

WebView.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.

WebView.Overflowed

Overflowed(width As Integer, height As Integer)

The area (in pixels) by which WebContainers have overflowed the bounds of a WebView whose LayoutType is set to Flex.

WebView.Resized

Resized

The WebView has been resized either because the user resized the browser window or the WebView was resized at runtime via code.

WebView.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:

Me.RemoveAllRows
Me.AddRow("Row 1", "Bob", "Roberts")
Me.AddRow("Row 2", "Barb", "Reynolds")

This example sets the text of a label:

If Session.LoggedIn Then
  Me.Text = "Welcome!"
Else
  Me.Text = "Welcome, " + Session.UserName
End If

Sample code

This code adds a WebTextField to the page:

Var tf As New WebTextField
tf.Left = 100
tf.Top = 50
tf.Enabled = True
Self.AddControl(tf)

Compatibility

Web projects on all supported operating systems.