How to call the callback function after JavaScript controls image loading

How to call the callback function after JavaScript controls image loading

This article mainly introduces how to call the callback function after JavaScript controls image loading. The example shows how to use the javascript callback function, which has some reference value. For more information, see

 

 

This example describes how to call the callback function after JavaScript controls image loading. Share it with you for your reference. The specific analysis is as follows:

This code can control the execution of the specified callback function after the images in the specified region are loaded.

The Code is as follows:

Function when_images_loaded ($ img_container, callback ){
/* Do callback when images in $ img_container (jQuery object) are loaded. only works when ALL images in $ img_container are newly inserted images and this function is called immediately after images are inserted into the target. */
Var _ imgs = $ img_container.find ('img '),
Img_length = _ imgs. length,
Img_load_cntr = 0;
If (img_length) {// if the $ img_container contains new images.
_ Imgs. on ('load', function () {// then we avoid the callback until images are loaded
Img_load_cntr ++;
If (img_load_cntr = img_length ){
Callback ();
}
});
}
Else {// otherwise just do the main callback action if there's no images in $ img_container.
Callback ();
}
}

 

I hope this article will help you design javascript programs.