container

The container in which to start searching for elements, and from which to listen to the scroll event

window

elements_selector

The selector of the image elements inside the container

"img"

threshold

The distance out of the viewport, expressed in pixel, before which to start loading the images

300

throttle

The time that has to pass between one element parsing and the following, when fast scroll events occur

40

data_src

The name of the data attribute containing the original image source. The "data-" is automatically added.

"original"

data_srcset

The name of the data attribute containing the original image source set. The "data-" is automatically added. If you also need to add the sizes

"original-set"

class_loading

The class applied to the elements while the loading is in progress

"loading"

class_loaded

The class applied to the elements when the loading is complete

"loaded"

skip_invisible

Specifies whether the script has to consider invisible images or not

true

show_while_loading

Specifies whether the script must show the images while they are loading. Set it to true when you use progressive JPEG format for your images. Note: to make the image visible while loading, you will have to avoid using the src attribute in the img tag

false

callback_load

A function to be called when an image was loaded.

null

callback_set

A function to be called when the src of an image is set in the DOM.

null

callback_processed

A function to be called when an image was processed.

null

placeholder

The URL of a placeholder image to be shown while the original image is loading. This option is ignored when the option show_while_loading is set to true

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