Lazy Load

 
What it does

When a large display of e.g. many thumbnails or many images in a filmstrip are potentially visible, only the ones that are actually inside the viewport c.q. browser window will be loaded from the server. As soon as other images become inside the viewport e.g. by scrolling, the images will be loaded from the server. This speeds up building up the initial display of the page.

How to activate

Select one of the options not being off in Advanced settings -> System -> I -> Item 23: Lazy load

How it is implemented

The way this is achieved is as smart as simple: On building up the page content, wppa <img> tags do not contain the src="..." attribute, but the data-src="..." attribute containing the images url.
On the events DOMContentLoaded, resize, scroll, orientationchange and a few others, the function wppaMakeLazyVisible() is called that replaces the attribute data-src by src with the same url for those images that became (partially) 'in sight'.
This immediately causes the images to be loaded. The data-src attribute is removed, so the check and creation of the src attribute happens only once for each lazy load image.

Example

[wppa type="thumbs" album="205" size="300" align="center"]

   
Durchschnittliche Bewertung  1 2 3 4 5fDu musst dich anmelden um abzustimmen
3671
3672
3673
3674
3675
3676
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3652
3653
3654
3655
3656
3657