Html2Canvas

Namespace: Wisej.Web.Ext.Html2Canvas

Assembly: Wisej.Web.Ext.Html2Canvas

• Component
  • Component
    • Html2Canvas

Implementation of the html2canvas (https://html2canvas.hertzen.com/) library. It's a singleton instance that can take a screenshot of a specific control or the entire browser and send the image back to the server.

C\\#

public class Html2Canvas : Component

VB.NET

Public Class Html2Canvas
    Inherits Component

Usage is quite easy:

  Html2Canvas.Screenshot(this, (image) => {
  image.Save(@"\images\screen.png");
});

  // or using asynchronous code:

  var image = await Html2Canvas.Screenshot(this.panel1);
  image.Save(@"\images\screen.png");

Methods

Screenshot(callback)

Takes a screenshot of the browser.

Parameter	Type	Description
callback	Action	Callback method that receives the Image object.

Throws:

• ArgumentNullException

  If any of the arguments is null.

Screenshot(options, callback)

Takes a screenshot of the browser.

Parameter	Type	Description
options	Html2CanvasOptions	The Html2CanvasOptions to pass to the html2canvas call.
callback	Action	Callback method that receives the Image object.

Throws:

• ArgumentNullException

  If any of the arguments is null.

Screenshot(target, callback)

Takes a screenshot of the specified Control.

Parameter	Type	Description
target	Control	The Control to render to an Image
callback	Action	Callback method that receives the Image object.

Throws:

• ArgumentNullException

  If any of the arguments is null.

Screenshot(target, options, callback)

Takes a screenshot of the specified Control.

Parameter	Type	Description
target	Control	The Control to render to an Image
options	Html2CanvasOptions	The Html2CanvasOptions to pass to the html2canvas call.
callback	Action	Callback method that receives the Image object.

Throws:

• ArgumentNullException

  If any of the arguments is null.

ScreenshotAsync(options)

Asynchronously returns an Image that represents a screenshot of the browser.

Parameter	Type	Description
options	Html2CanvasOptions	The Html2CanvasOptions to pass to the html2canvas call.

Returns: Task. An awaitable Task that contains the screenshot.

ScreenshotAsync(target, options)

Asynchronously returns an Image that represents a screenshot of the specified Control as it appears on the browser.

Parameter	Type	Description
target	Control	The Control to render to an Image
options	Html2CanvasOptions	The Html2CanvasOptions to pass to the html2canvas call.

Returns: Task. An awaitable Task that contains the screenshot.

Inherited

Methods

Name	Description	From
Update()		Component