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javascript - jQuery 延迟加载 - 显示问题 :none

转载 作者:行者123 更新时间:2023-11-30 10:50:22 25 4
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我想在我的一个网站中显示延迟加载,问题是我有几张图片必须隐藏,直到我需要它们(例如,表单上使用的警告标志 - 验证过程 - 图像仅可见当字段填写不正确时)。

是否有修改延迟加载的解决方案,使其忽略所有包含“display:none”属性的图像?

非常感谢!

插件网址:http://www.appelsiini.net/projects/lazyload

页面使用的代码:

<script src="js/jquery.lazyload.js />" type="text/javascript"></script>
<script type="text/javascript" charset="utf-8">
$(function() {
if
$("img").lazyload({
placeholder : "img/grey.gif",
effect : "fadeIn"
});
});
</script>

和插件代码(jquery.lazyload.js)

(function($) {
$.fn.lazyload = function(options) {
var settings = {
threshold : 0,
failurelimit : 0,
event : "scroll",
effect : "show",
container : window
};

if(options) {
$.extend(settings, options);
}

/* Fire one scroll event per scroll. Not one scroll event per image. */
var elements = this;
if ("scroll" == settings.event) {
$(settings.container).bind("scroll", function(event) {

var counter = 0;
elements.each(function() {
if ($.abovethetop(this, settings) ||
$.leftofbegin(this, settings)) {
/* Nothing. */
} else if (!$.belowthefold(this, settings) &&
!$.rightoffold(this, settings)) {
$(this).trigger("appear");
} else {
if (counter++ > settings.failurelimit) {
return false;
}
}
});
/* Remove image from array so it is not looped next time. */
var temp = $.grep(elements, function(element) {
return !element.loaded;
});
elements = $(temp);
});
}

this.each(function() {
var self = this;

/* Save original only if it is not defined in HTML. */
if (undefined == $(self).attr("original")) {
$(self).attr("original", $(self).attr("src"));
}

if ("scroll" != settings.event ||
undefined == $(self).attr("src") ||
settings.placeholder == $(self).attr("src") ||
($.abovethetop(self, settings) ||
$.leftofbegin(self, settings) ||
$.belowthefold(self, settings) ||
$.rightoffold(self, settings) )) {

if (settings.placeholder) {
$(self).attr("src", settings.placeholder);
} else {
$(self).removeAttr("src");
}
self.loaded = false;
} else {
self.loaded = true;
}

/* When appear is triggered load original image. */
$(self).one("appear", function() {
if (!this.loaded) {
$("<img />")
.bind("load", function() {
$(self)
.hide()
.attr("src", $(self).attr("original"))
[settings.effect](settings.effectspeed);
self.loaded = true;
})
.attr("src", $(self).attr("original"));
};
});

/* When wanted event is triggered load original image */
/* by triggering appear. */
if ("scroll" != settings.event) {
$(self).bind(settings.event, function(event) {
if (!self.loaded) {
$(self).trigger("appear");
}
});
}
});

/* Force initial check if images should appear. */
$(settings.container).trigger(settings.event);

return this;

};

/* Convenience methods in jQuery namespace. */
/* Use as $.belowthefold(element, {threshold : 100, container : window}) */

$.belowthefold = function(element, settings) {
if (settings.container === undefined || settings.container === window) {
var fold = $(window).height() + $(window).scrollTop();
} else {
var fold = $(settings.container).offset().top + $(settings.container).height();
}
return fold <= $(element).offset().top - settings.threshold;
};

$.rightoffold = function(element, settings) {
if (settings.container === undefined || settings.container === window) {
var fold = $(window).width() + $(window).scrollLeft();
} else {
var fold = $(settings.container).offset().left + $(settings.container).width();
}
return fold <= $(element).offset().left - settings.threshold;
};

$.abovethetop = function(element, settings) {
if (settings.container === undefined || settings.container === window) {
var fold = $(window).scrollTop();
} else {
var fold = $(settings.container).offset().top;
}
return fold >= $(element).offset().top + settings.threshold + $(element).height();
};

$.leftofbegin = function(element, settings) {
if (settings.container === undefined || settings.container === window) {
var fold = $(window).scrollLeft();
} else {
var fold = $(settings.container).offset().left;
}
return fold >= $(element).offset().left + settings.threshold + $(element).width();
};
/* Custom selectors for your convenience. */
/* Use as $("img:below-the-fold").something() */

$.extend($.expr[':'], {
"below-the-fold" : "$.belowthefold(a, {threshold : 0, container: window})",
"above-the-fold" : "!$.belowthefold(a, {threshold : 0, container: window})",
"right-of-fold" : "$.rightoffold(a, {threshold : 0, container: window})",
"left-of-fold" : "!$.rightoffold(a, {threshold : 0, container: window})"
});

})(jQuery);

最佳答案

Lazy Load is currently not usable. It does not work with the latest browsers as expected.

...从你的插件的url
如果您仍想使用该插件,我想您可以调用

$("img:visible").lazyload({
placeholder : "img/grey.gif",
effect : "fadeIn"
});

希望对你有帮助...

关于javascript - jQuery 延迟加载 - 显示问题 :none,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/5764006/

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