我有一个jQueryUI对话框,它加载了一个带有Ajax请求的幻灯片。
如何将.dialog('open')
延迟到加载完所有图像?(一些移动连接需要一些时间来加载所有图像)
编辑(2013-07-04)以更好地澄清问题:此对话框在下载所有图像之前加载并准备就绪。这会使一些幻灯片更改为黑色或半加载图像。我想要的是只有当.jpg文件在浏览器缓存中时才开始幻灯片放映。
var eld = $('<div style="display:none" class="loading"></div>').appendTo('body');
eld.dialog({
autoOpen: false,
open: function() {
$(this).html('').load ("img_swiper.php?img_url="+url, function() {
$('.ui-widget-overlay').bind('click', function() {
eld.dialog('close');
})
});
},
close: function(event, ui) {
eld.remove();
},
modal: true,
height: 385,
width: 750
});
eld.dialog('open');
此时,当您打开对话框时,加载会停止,所以如果您延迟打开对话框,则加载不会发生任何变化。所以,若你们想在打开对话框之前加载图像,那个么你们不应该在打开函数中加载div主体。
我还没有测试过,但也许这样的东西会起作用:1.将正文加载到隐藏的div中2.检查器功能的启动间隔,以查看何时加载所有图像。3.打开对话框
var eld = $('<div style="display:none" class="loading"></div>').appendTo('body');
eld.dialog({
autoOpen: false,
open: function() {
},
close: function(event, ui) {
eld.remove();
},
modal: true,
height: 385,
width: 750
});
function IsImageOk(img) {
// During the onload event, IE correctly identifies any images that
// weren’t downloaded as not complete. Others should too. Gecko-based
// browsers act like NS4 in that they report this incorrectly.
if (!img.complete) {
return false;
}
// However, they do have two very useful properties: naturalWidth and
// naturalHeight. These give the true size of the image. If it failed
// to load, either of these should be zero.
if (typeof img.naturalWidth != "undefined" && img.naturalWidth == 0) {
return false;
}
// No other way of checking: assume it’s ok.
return true;
}
//Function for checking all images
function chk_images(where)
{
var img_count = $('img', where);
var ok_count = 0;
$('img', where).each(function(){
if (IsImageOk($(this).get(0)) )
{
ok_count++;
}
});
if (ok_count == img_count) return true;
return false;
}
eld.html('').load ("img_swiper.php?img_url="+url, function() {
//Set up checker function
var interval = setInterval(function(){
//Check images inside eld
if (chk_images(eld))
{
//Stop futher checking
clearInterval(interval);
eld.dialog('open');
}
},1000);
$('.ui-widget-overlay').bind('click', function() {
eld.dialog('close');
});
});
如果浏览器不想在隐藏的div中加载图像,那么您可以将这个div从屏幕上移动到绝对位置,并使其在加载鼠标时可见。类似于eld.css({position:‘absolute’,top:‘-1000px’,left:‘-1000px‘});
检查Allso:
- http://www.sajithmr.me/javascript-check-an-image-is-loaded-or-not
- http://www.w3schools.com/js/js_timing.asp