cfclientsettings

Description

This tag is similar to cfprocessingdirective and acts as a compiler directive to include plugins for various features (device detection and device API). You can use this tag to load all the required device plugins and device detection plugins.

Syntax

See also

cfclient

History

• ColdFusion (2018 release) Update 2: Added the attributes mobileServer and validationCFC.
• ColdFusion 11: Added this tag.
  

Device detection

The device detection feature of CFML allows you to identify the device properties and characteristics, which can be used to determine the best content, layout, mark-up or application to serve to the given device.

These characteristics include screen size, browser type and version, media support, and the level of support for CSS, HTML, and JavaScript.

For getting the device features and capabilities, you need to specify an attribute detectdevice in the <cfclientsettings> tag and set it to true:

If the detectdevice attribute is set to true, ColdFusion automatically detects the features and capabilities of the device (width, height, and orientation) on which the application is running.

The following example shows the usage of the device detection feature:

In the above example, we are trying to find if the device supports HTML5 Canvas.  cfclient.canvas returns a boolean value indicating the support for the HTML5 Canvas property.

In the above example, we are trying to find if the device supports HTML5 Canvas.  cfclient.canvas returns a boolean value indicating the support for the HTML5 Canvas property.

ColdFusion Server internally uses Modernizer JavaScript library (version 2.6.2) for the device detection feature.

The following table lists the supported device features with example usage:

For the description on all above mentioned features, see the Modernizer documentation.

Using media queries

Media queries allow you to apply changes to the page design based on the viewing size and capability of the device on which your content is displayed. A media query consists of one or more logical expressions formed using the detected device data that checks for certain conditions of media feature and based on the result of this expression we can change the layout of the page dynamically.

If you are building a mobile application, you can easily detect the characteristics of the device and customize the layout just for that device as shown in the following example:

In the above example, the web page is customized for different devices based on their screen sizes.

Handling orientation changes

For handling the device orientation changes, you can register a listener using the addOrientationListener() function:

In the above example, addOrientationListener function is used to register a listener that monitors the orientation of the device (landscape or portrait). When the orientation of the device changes, an orientationHandler call back function is invoked.

You can use the removeOrientationListener to un-register the listener:

You can also add multiple listeners:

When the device orientation changes, all the registered listener functions are invoked.

Handling window resizing events

For handling the window resizing events, you can register a listener using the addResizeListener() function:

You can also add multiple listeners:

When there is a change in window size  all the registered resize listener functions are invoked. You can use removeResizeListener() to un-register the handlers.

Using the attributes mobileServer and validationCFC, 

<cfclientsettings mobileserver='http://localhost:8500' enabledeviceapi="false" validationcfc='C:\ColdFusion2018\cfusion\wwwroot\CheckAuthFlow\handler.cfc'>

Setting device timeout

In the <cfclientsettings> tag, an attribute called deviceTimeOut can be specified. The default value of deviceTimeout is 10 secs. When enableDeviceApi or detectDevice is set as true, the deviceTimeOut value will be honored. Time will be provided for the required plugins to be loaded. After the specified time, an exception will be thrown.

<cfclientsettings detectDevice=true deviceTimeOut="30" />