我通过AJAX加载元素。其中一些只有当你向下滚动页面时才能看到。有什么方法可以知道元素现在是否在页面的可见部分?
当前回答
我更喜欢使用jQuery expr
jQuery.extend(jQuery.expr[':'], {
inview: function (elem) {
var t = $(elem);
var offset = t.offset();
var win = $(window);
var winST = win.scrollTop();
var elHeight = t.outerHeight(true);
if ( offset.top > winST - elHeight && offset.top < winST + elHeight + win.height()) {
return true;
}
return false;
}
});
你可以这样用
$(".my-elem:inview"); //returns only element that is in view
$(".my-elem").is(":inview"); //check if element is in view
$(".my-elem:inview").length; //check how many elements are in view
你可以很容易地在滚动事件函数中添加这样的代码等,以检查它每次用户将滚动视图。
其他回答
这将考虑元素的任何填充、边框或边距,以及大于视口本身的元素。
function inViewport($ele) {
var lBound = $(window).scrollTop(),
uBound = lBound + $(window).height(),
top = $ele.offset().top,
bottom = top + $ele.outerHeight(true);
return (top > lBound && top < uBound)
|| (bottom > lBound && bottom < uBound)
|| (lBound >= top && lBound <= bottom)
|| (uBound >= top && uBound <= bottom);
}
要调用它,可以使用这样的代码:
var $myElement = $('#my-element'),
canUserSeeIt = inViewport($myElement);
console.log(canUserSeeIt); // true, if element is visible; false otherwise
在这个伟大答案的基础上,你可以使用ES2015+进一步简化它:
function isScrolledIntoView(el) {
const { top, bottom } = el.getBoundingClientRect()
return top >= 0 && bottom <= window.innerHeight
}
如果你不关心顶部是否跳出窗口而只关心底部是否被看到,这可以简化为
function isSeen(el) {
return el.getBoundingClientRect().bottom <= window.innerHeight
}
或者甚至是单行语句
const isSeen = el => el.getBoundingClientRect().bottom <= window.innerHeight
这里有一种使用Mootools实现相同目标的方法,可以是水平的、垂直的或两者都有。
Element.implement({
inVerticalView: function (full) {
if (typeOf(full) === "null") {
full = true;
}
if (this.getStyle('display') === 'none') {
return false;
}
// Window Size and Scroll
var windowScroll = window.getScroll();
var windowSize = window.getSize();
// Element Size and Scroll
var elementPosition = this.getPosition();
var elementSize = this.getSize();
// Calculation Variables
var docViewTop = windowScroll.y;
var docViewBottom = docViewTop + windowSize.y;
var elemTop = elementPosition.y;
var elemBottom = elemTop + elementSize.y;
if (full) {
return ((elemBottom >= docViewTop) && (elemTop <= docViewBottom)
&& (elemBottom <= docViewBottom) && (elemTop >= docViewTop) );
} else {
return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
},
inHorizontalView: function(full) {
if (typeOf(full) === "null") {
full = true;
}
if (this.getStyle('display') === 'none') {
return false;
}
// Window Size and Scroll
var windowScroll = window.getScroll();
var windowSize = window.getSize();
// Element Size and Scroll
var elementPosition = this.getPosition();
var elementSize = this.getSize();
// Calculation Variables
var docViewLeft = windowScroll.x;
var docViewRight = docViewLeft + windowSize.x;
var elemLeft = elementPosition.x;
var elemRight = elemLeft + elementSize.x;
if (full) {
return ((elemRight >= docViewLeft) && (elemLeft <= docViewRight)
&& (elemRight <= docViewRight) && (elemLeft >= docViewLeft) );
} else {
return ((elemRight <= docViewRight) && (elemLeft >= docViewLeft));
}
},
inView: function(full) {
return this.inHorizontalView(full) && this.inVerticalView(full);
}});
function isScrolledIntoView(elem) {
var docViewTop = $(window).scrollTop(),
docViewBottom = docViewTop + $(window).height(),
elemTop = $(elem).offset().top,
elemBottom = elemTop + $(elem).height();
//Is more than half of the element visible
return ((elemTop + ((elemBottom - elemTop)/2)) >= docViewTop && ((elemTop + ((elemBottom - elemTop)/2)) <= docViewBottom));
}
这应该可以达到目的:
function isScrolledIntoView(elem)
{
var docViewTop = $(window).scrollTop();
var docViewBottom = docViewTop + $(window).height();
var elemTop = $(elem).offset().top;
var elemBottom = elemTop + $(elem).height();
return ((elemBottom <= docViewBottom) && (elemTop >= docViewTop));
}
简单实用函数 这将允许您调用一个实用函数,该函数接受您正在寻找的元素,以及您希望元素完全或部分地显示在视图中。
function Utils() {
}
Utils.prototype = {
constructor: Utils,
isElementInView: function (element, fullyInView) {
var pageTop = $(window).scrollTop();
var pageBottom = pageTop + $(window).height();
var elementTop = $(element).offset().top;
var elementBottom = elementTop + $(element).height();
if (fullyInView === true) {
return ((pageTop < elementTop) && (pageBottom > elementBottom));
} else {
return ((elementTop <= pageBottom) && (elementBottom >= pageTop));
}
}
};
var Utils = new Utils();
使用
var isElementInView = Utils.isElementInView($('#flyout-left-container'), false);
if (isElementInView) {
console.log('in view');
} else {
console.log('out of view');
}