我找到了一种无需更改绝对位置即可使用的方法!
完整的未注释代码
var scrollPos = $(document).scrollTop();
$(window).scroll(function(){
scrollPos = $(document).scrollTop();
});
var savedScrollPos = scrollPos;
function is_iOS() {
var iDevices = [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
];
while (iDevices.length) {
if (navigator.platform === iDevices.pop()){ return true; }
}
return false;
}
$('input[type=text]').on('touchstart', function(){
if (is_iOS()){
savedScrollPos = scrollPos;
$('body').css({
position: 'relative',
top: -scrollPos
});
$('html').css('overflow','hidden');
}
})
.blur(function(){
if (is_iOS()){
$('body, html').removeAttr('style');
$(document).scrollTop(savedScrollPos);
}
});
分解
首先,您需要将固定输入字段移到HTML中页面的顶部(这是一个固定元素,因此从语义上来说无论如何都应使其靠近顶部):
<!DOCTYPE HTML>
<html>
<head>
<title>Untitled</title>
</head>
<body>
<form class="fixed-element">
<input class="thing-causing-the-issue" type="text" />
</form>
<div class="everything-else">(content)</div>
</body>
</html>
然后,您需要将当前滚动位置保存到全局变量中:
//Always know the current scroll position
var scrollPos = $(document).scrollTop();
$(window).scroll(function(){
scrollPos = $(document).scrollTop();
});
//need to be able to save current scroll pos while keeping actual scroll pos up to date
var savedScrollPos = scrollPos;
然后,您需要一种检测iOS设备的方法,以使其不会影响不需要此修复程序的事情(该功能取自https://stackoverflow.com/a/9039885/1611058)
//function for testing if it is an iOS device
function is_iOS() {
var iDevices = [
'iPad Simulator',
'iPhone Simulator',
'iPod Simulator',
'iPad',
'iPhone',
'iPod'
];
while (iDevices.length) {
if (navigator.platform === iDevices.pop()){ return true; }
}
return false;
}
现在我们有了所需的一切,这是解决方法:)
//when user touches the input
$('input[type=text]').on('touchstart', function(){
//only fire code if it's an iOS device
if (is_iOS()){
//set savedScrollPos to the current scroll position
savedScrollPos = scrollPos;
//shift the body up a number of pixels equal to the current scroll position
$('body').css({
position: 'relative',
top: -scrollPos
});
//Hide all content outside of the top of the visible area
//this essentially chops off the body at the position you are scrolled to so the browser can't scroll up any higher
$('html').css('overflow','hidden');
}
})
//when the user is done and removes focus from the input field
.blur(function(){
//checks if it is an iOS device
if (is_iOS()){
//Removes the custom styling from the body and html attribute
$('body, html').removeAttr('style');
//instantly scrolls the page back down to where you were when you clicked on input field
$(document).scrollTop(savedScrollPos);
}
});