本文實(shí)例講述了JavaScript控制圖片加載完成后調(diào)用回調(diào)函數(shù)的方法。分享給大家供大家參考。具體分析如下：
這段代碼可以控制指定區(qū)域內(nèi)的圖片加載完成后執(zhí)行指定的回調(diào)函數(shù)。
復(fù)制代碼代碼如下:
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();
}
}
/* 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();
}
}
希望本文所述對(duì)大家的javascript程序設(shè)計(jì)有所幫助。
