Slide Preview

Please note

Starting from server version 1.9, Wallboard no longer allows content previews to be displayed in a browser for more than 15 minutes, or in offline mode unless the preview is running in signage mode.

Open Slide preview

From Slide Overview

From Slide

You can also open the preview of the content by opening the context menu of the content then select Preview in browser.

Preview modes

Preview

• This option will open the slide in browser preview.

Advanced preview mode

• In advanced preview mode you can add extra URL parameters to make the preview display more similar to the actual play on the device.

The following extras can be added:

• Content Sync
• Play Autosaved content
• Data row label
• Datasource
• Time zone
• Screen

URL Parameters

In the link of the preview you can set the following parameters:

To display the autosaved or saved version

`autoSaved=true/false` 

To wait for content sync or not

`noSync=true` 

Template

`isTemplate=false`

To be muted (default true)

`muted=true`

To watch with specific time zone

`timeZone=Europe~2FBudapest`

To display as it would play on device

`deviceId=01234567890123456789012345678901`

Previewing contents with custom scripts

By default functionalities like running custom scripts and calling APIs are disabled when previewing contents in your browser. This is a security rule that is applied to prevent intentional and unintentional harmful scripts from running in your browser.

Please note

You do not need to disable web security in browser in order to preview contents containing custom scripts, you can utilize browser's incognito mode to do so.

How to disable browser security feature temporarily while previewing a content

• Open the preview of the content in your browser, and press F12 on your keyboard. The devTools window will open, and you can navigate over to the Console tab to view the error.

  

• The error will only show up in the console when the custom action happens, so interact with your content until you see the error message popup.

  

• Once the error shows, right-click at the end of it on the getContentId() part, and select store as global variable.

  

• Once you stored the script as a global variable you need to run it in the console. Type temp1(); and hit enter on your keyboard.

  

• After running the script, you can refresh your browser window with F5 on your keyboard or with the refresh button, and all the custom functionalities should work in your content. You only have to go through this process once for every content.

Previewing contents with embedded iframe

You can preview content that includes embedded iframes.

However, please be aware of the following:

• There are certain limitations when it comes to embedding iframe content.
  For more details, refer to this guide: How to Embed Iframes

• Interactions with iframe content are not supported in preview mode.
  This means that features relying on user interaction, such as Screensaver triggers, may not function as expected.

Autoplay policy

Please note:

The Autoplay Policy launched in Chrome 66 for audio and video elements and is effectively blocking roughly half of unwanted media autoplays in Chrome

Chrome's autoplay policy

• Muted autoplay is always allowed.

• Autoplay with sound is allowed if:

  • The user has interacted with the domain (click, tap, etc.).
  • On desktop, the user's Media Engagement Index threshold has been crossed, meaning the user has previously played video with sound.
  • The user has added the site to their home screen on mobile or installed the PWA on desktop.
  • Top frames can delegate autoplay permission to their iframes to allow autoplay with sound.

• Modern web browsers enforce this policy to prevent unwanted media from playing automatically, including videos with sound, without user intervention.

  • This is to enhance the user experience and save bandwidth, particularly for mobile users.
  • Therefore, previews in certain browsers may not play automatically.

To ensure that previews play in your local browser at any time please check your browser settings accordingly.

In Chrome versions 61-72

• Write chrome://flags/#autoplay-policy in your search bar
• Find the Autoplay policy section
• Select No user gesture is required

Please note

Autoplay flag has been discontinued by Chrome since the 76 version

In Safari

• Click on the Safari button, and select the Preferences menu
• Choose the Websites panel, and find the Auto-Play section
• In the right bottom corner, you will see the When visiting other websites: option, choose the Allow All Auto-Play