Libraries.Web.Page.Canvas Documentation

The Canvas class represents HTML's (Hypertext Markup Language) canvas tag which is used to place a canvas on the page that is used as a container for grapics. A canvas should have a id so that graphics can be added to it specifically. You can find more information about this tag at: The canvas attribute.

Example Code


use Libraries.Web.Page.all
class Main
action main
   WebPage page
   
   Canvas canvas
   canvas:SetIdentifier("myCanvas")

   Script script
   script:SetType("text/javascript")
   script:SetCode("var canvas=document.getElementById('myCanvas');
                   var ctx=canvas.getContext('2d');
                   ctx.fillStyle='#FF0000';
                   ctx.fillRect(0,0,80,100);")
   page:AddToBody(canvas)
   page:AddToBody(script)
   output page:Generate()
end
end

Inherits from: Libraries.Web.Page.AttributeAccepter, Libraries.Language.Object, Libraries.Web.Page.GlobalAttributeAccepter, Libraries.Web.Page.WebTag, Libraries.Web.Page.FlowContent

Actions Documentation

Add(Libraries.Web.Page.Attribute attribute)

This action adds an attribute to this object. If an attribute with the same name as

Parameters

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

Attribute attribute
attribute:SetName("src")
attribute:SetValue("http://www.google.com")

AttributeAccepter accept
accept:Add(attribute)

AddAttribute(text name, text value)

This action adds an attribute to this object. This action is a helper action, which essentially does the same thing as the Add(Attribute) action. If an attribute with the same name as

Parameters

  • text name: The name of the attribute functions as a key. For example, in a link, we might have a "src" and an actual address, like google.com. In this case, the name would be equivalent to the src.
  • text value: As an example of link, imagine we have a value of "src" and an actual address, like google.com. In this case, the value would be equivalent to google.com.

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")

AddClassAttribute(text value)

Adds to the ClassAttribute attribute. Multiple class names can be listed in the passed text, separated by a space.

Parameters

  • text value: The classes to be added to the element

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:AddClassAttribute("myClass")

AddNestedTag(Libraries.Web.Page.WebTag tag)

This action adds a WebTag to the list of WebTags contained within the current WebTag.

Parameters

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData


//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:SetDescription("name")
row:Add(cell)

AddText(text value)

This action sets the description text for this WebTag.

Parameters

  • text value: The text contained in the WebTag.

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData

//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:AddDescription("name")
row:Add(cell)

Compare(Libraries.Language.Object object)

This action compares two object hash codes and returns an integer. The result is larger if this hash code is larger than the object passed as a parameter, smaller, or equal. In this case, -1 means smaller, 0 means equal, and 1 means larger. This action was changed in Quorum 7 to return an integer, instead of a CompareResult object, because the previous implementation was causing efficiency issues.

Parameters

Return

integer: The Compare result, Smaller, Equal, or Larger.

Example

Object o
Object t
integer result = o:Compare(t) //1 (larger), 0 (equal), or -1 (smaller)

Equals(Libraries.Language.Object object)

This action determines if two objects are equal based on their hash code values.

Parameters

Return

boolean: True if the hash codes are equal and false if they are not equal.

Example

use Libraries.Language.Object
use Libraries.Language.Types.Text
Object o
Text t
boolean result = o:Equals(t)

Generate()

This action gets the width attribute of the canvas.

Return

text: The width in pixels of the canvas.

Example


use Libraries.Web.Page.Canvas
use Libraries.Web.Page.Attribute

Canvas canvas
Attribute widthInPixels = canvas:GetWidth()
if widthInPixels not= undefined
    text width = widthInPixels:GetValue()
end

GenerateAttributes()

This action returns a text description of all attributes stored.

Return

text:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")
text result = accept:GenerateAttributes()

GenerateNestedTags()

This action generates the HTML output text of all of the nested WebTags.

Return

text: The text including all webtags within this WebTag.

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData

//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:SetDescription("name")
row:Add(cell)
output row:GenerateNestedTags()

GetAccessKey()

Returns the AccessKey attribute. Specifies a shortcut key for the web element.

Return

Libraries.Web.Page.Attribute: The current AccessKey attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetAccessKey()

GetAttribute(text name)

This action returns an attribute from this object's Attributes object. If no attribute exists for a given key, this action returns undefined.

Parameters

  • text name

Return

Libraries.Web.Page.Attribute:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
//as we have not set any attribute, this would
//return undefined
Attribute attribute = accept:GetAttribute("src")

GetAttributeValue(text name)

This action returns an attribute from this object's Attributes object. If no attribute exists for a given key, this action returns undefined.

Parameters

  • text name: The key value in this case is described in more detail in the documentation for this class's Add actions.

Return

text:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")
//This helper action would throw an error if "src" were not set.
text value = accept:GetAttributeValue("src")

GetAttributes()

Returns a list of all attributes on the system.

Return

Libraries.Web.Page.Attributes: The attributes class contains all of the attributes that have been set for this object.

Example



use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attributes

AttributeAccepter accept
Attributes attributes = accept:GetAttributes()

GetClassAttribute()

Returns the ClassAttribute attribute.

Return

Libraries.Web.Page.Attribute: The current ClassAttribute attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetClassAttribute()

GetContentEditable()

Returns the ContentEditable attribute.

Return

Libraries.Web.Page.Attribute: The current ContentEditable attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetContentEditable()

GetContextMenu()

Returns the ContextMenu attribute.

Return

Libraries.Web.Page.Attribute: The current ContextMenu attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetContextMenu()

GetDraggable()

Returns the Draggable attribute.

Return

Libraries.Web.Page.Attribute: The current Draggable attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetDraggable()

GetDropZone()

Returns the DropZone attribute.

Return

Libraries.Web.Page.Attribute: The current DropZone attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetDropZone()

GetHashCode()

This action gets the hash code for an object.

Return

integer: The integer hash code of the object.

Example

Object o
integer hash = o:GetHashCode()

GetHeight()

This action gets the height attribute of the canvas.

Return

Libraries.Web.Page.Attribute: The height in pixels of the canvas.

Example


use Libraries.Web.Page.Canvas
use Libraries.Web.Page.Attribute

Canvas canvas
Attribute heightInPixels = canvas:GetHeight()
if heightInPixels not= undefined
    text height = heightInPixels:GetValue()
end

GetHidden()

Returns the Hidden attribute.

Return

Libraries.Web.Page.Attribute: The current Hidden attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetHidden()

GetIdentifier()

Returns the Identifier attribute.

Return

Libraries.Web.Page.Attribute: The current Identifier attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetIdentifier()

GetIterator()

This action returns an iterator of all attributes stored in this object.

Return

Libraries.Containers.Iterator:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute
use Libraries.Containers.Iterator

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")

//output out all of the attributes
Iterator<Attribute> it =  accept:GetIterator()
repeat while it:HasNext()
    Attribute at = it:Next()
    output at:Generate()
end

GetLanguage()

Returns the Language attribute.

Return

Libraries.Web.Page.Attribute: The current Language attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetLanguage()

GetNumberOfAttributes()

This action returns the number of attributes that are currently stored in this object.

Return

integer:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")
integer num = accept:GetNumberOfAttributes()

GetNumberOfNestedTags()

This action gets the number of nested tags within the current WebTag.

Return

integer: The number of nested tags.

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData

//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:SetDescription("name")
row:Add(cell)
integer numTags = row:GetSize()

GetSpellcheck()

Returns the Spellcheck attribute.

Return

Libraries.Web.Page.Attribute: The current Spellcheck attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetSpellcheck()

GetStyle()

Returns the Style attribute.

Return

Libraries.Web.Page.Attribute: The current Style attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetStyle()

GetTabIndex()

Returns the TabIndex attribute.

Return

Libraries.Web.Page.Attribute: The current TabIndex attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetTabIndex()

GetTag(integer index)

This action gets the number of nested tags within the current WebTag.

Parameters

  • integer index

Return

Libraries.Web.Page.WebTag: The number of nested tags.

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData

//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:SetDescription("name")
row:Add(cell)
WebTag tag = row:GetTag(0)

GetTextDirection()

Returns the TextDirection attribute.

Return

Libraries.Web.Page.Attribute: The current TextDirection attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetTextDirection()

GetTitle()

Returns the Title attribute.

Return

Libraries.Web.Page.Attribute: The current Title attribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
Attribute attribute = accept:GetTitle()

GetWidth()

This action gets the width attribute of the canvas.

Return

Libraries.Web.Page.Attribute: The width in pixels of the canvas.

Example


use Libraries.Web.Page.Canvas
use Libraries.Web.Page.Attribute

Canvas canvas
Attribute widthInPixels = canvas:GetWidth()
if widthInPixels not= undefined
    text width = widthInPixels:GetValue()
end

HasAttribute(text name)

This action returns whether or not an attribute exists for the key passed in as a parameter.

Parameters

  • text name: The key value in this case is described in more detail in the documentation for this class's Add actions.

Return

boolean:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")
//This helper action would throw an error if "src" were not set.
boolean exists = accept:HasAttribute("src")

Remove(Libraries.Web.Page.WebTag tag)

This action removes the first instance of a webtag found in the list of sub-WebTags.

Parameters

Example

use Libraries.Web.Page.TableRow
use Libraries.Web.Page.TableData

//TableRow and TableData are both WebTags
TableRow row
TableData cell
cell:SetDescription("name")
row:Add(cell)
row:Remove(cell)

RemoveAttribute(text name)

This action removes an attribute with a particular key. If that attribute does not exist, then this action returns undefined.

Parameters

  • text name: The name of the attribute that should be removed.

Return

Libraries.Web.Page.Attribute:

Example


use Libraries.Web.Page.AttributeAccepter
use Libraries.Web.Page.Attribute

AttributeAccepter accept
accept:AddAttribute("src", "http://www.google.com")
//This helper action would throw an error if "src" were not set.
accept:RemoveAttribute("src")

SetAccessKey(text value)

Sets the AccessKey attribute. Specifies a shortcut key for the web element.

Parameters

  • text value: The current AccessKey.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetAccessKey("z")

SetClassAttribute(text value)

Sets the ClassAttribute attribute. Specifies a class name for the element.

Parameters

  • text value: The current ClassAttribute.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetClassAttribute("myClass")

SetContentEditable(text value)

Sets the ContentEditable attribute. Specifies wether content in an element is editable.

Parameters

  • text value: The current ContentEditable.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetContentEditable("true")

SetContextMenu(text value)

Sets the ContextMenu attribute. Specifies a context menu that contains the element.

Parameters

  • text value: The current ContextMenu.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetContextMenu("parentmenu")

SetDraggable(boolean value)

Sets the Draggable attribute. Specifies wether an element is draggable or not.

Parameters

  • boolean value: The current Draggable.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetDraggable(true)

SetDropZone(text value)

Sets the DropZone attribute. This element specifies what happens when an element is dropped on a web page. The three valid values are copy, move, and link.

Parameters

  • text value: The current DropZone.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetDropZone("move")

SetHeight(text value)

This action sets the height attribute of the canvas.

Parameters

  • text value: The height in pixel to set to the canvas.

Example


use Libraries.Web.Page.Canvas

Canvas canvas
canvas:SetHeight("150")

SetHidden(boolean value)

Sets the AccessKey attribute. Specifies wether an element is hidden or not.

Parameters

  • boolean value: To true to hide element and false to make it visible.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetHidden(false)

SetIdentifier(text value)

Sets the Identifier attribute. Specifies a unique name for the element.

Parameters

  • text value: The current Identifier.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetIdentifier("myElement")

SetLanguage(text value)

Creates and sets an attribute for language. As these codes are esoteric in the standard on the web (HTML), we recommend using the LanguageCode class to help.

Parameters

  • text value

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.LanguageCode
use Libraries.Web.Page.Link

LanguageCode code
//use any WebItem, in this case a link
Link link
link:SetLanguage(code:english)

SetSpellcheck(boolean value)

Sets the Spellcheck attribute. Specifies wether spellcheck is on or off.

Parameters

  • boolean value: The current Spellcheck.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetSpellcheck(true)

SetStyle(text value)

Sets the Style attribute. Specifies inline css formatting for an element.

Parameters

  • text value: The current Style.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetStyle("color:orange")

SetTabIndex(text value)

Sets the TabIndex attribute. Specifies a tab order for elements.

Parameters

  • text value: The current TabIndex.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetTabIndex("0")

SetTextDirection(text value)

Sets the TextDirection attribute. Specifies a direction for the text to be written. For example, "ltr" is left-to-right.

Parameters

  • text value: The current TextDirection.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetTextDirection("rtl")

SetTitle(text value)

Sets the Title attribute. Specifies title information for the web element.

Parameters

  • text value: The current Title.

Example



use Libraries.Web.Page.GlobalAttributeAccepter
use Libraries.Web.Page.Attribute

GlobalAttributeAccepter accept
accept:SetTitle("MyTitle")

SetWidth(text value)

This action sets the width attribute of the canvas.

Parameters

  • text value: The width in pixel to set to the canvas.

Example


use Libraries.Web.Page.Canvas

Canvas canvas
canvas:SetWidth("150")

ToText()

This action generates text for a particular web page. It is a helper action for Generate()

Return

text: This returns text in hypertext markup language (HTML) representing the tag.

Example

use Libraries.Web.Page.WebPage

WebPage page
text result = page:ToText()
//output out the web page
output result