絶対位置に変更する必要なしに機能する方法を見つけました!
完全なコメント化されていないコード
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);
}
});
それを壊す
最初に、HTMLの固定入力フィールドをページの上部に向ける必要があります(これは固定要素であるため、意味的には、上部近くに配置する必要があります)。
<!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>
次に、現在のスクロール位置をグローバル変数に保存する必要があります。
//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;
次に、修正が不要なものに影響を与えないようにiOSデバイスを検出する方法が必要です(https://stackoverflow.com/a/9039885/1611058から取得した関数)
//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;
}
これで必要なものがすべて揃ったので、修正します:)
//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);
}
});