fand ich die Antwort, indem Sie dieses Skript: http://callmenick.com/post/animated-resizing-header-on-scroll Hier ist seine "classie.js" Skript:
/*!
* classie v1.0.0
* class helper functions
* from bonzo https://github.com/ded/bonzo
* MIT license
*
* classie.has(elem, 'my-class') -> true/false
* classie.add(elem, 'my-new-class')
* classie.remove(elem, 'my-unwanted-class')
* classie.toggle(elem, 'my-class')
*/
/*jshint browser: true, strict: true, undef: true, unused: true */
/*global define: false */
(function(window) {
'use strict';
// class helper functions from bonzo https://github.com/ded/bonzo
function classReg(className) {
return new RegExp("(^|\\s+)" + className + "(\\s+|$)");
}
// classList support for class management
// altho to be fair, the api sucks because it won't accept multiple classes at once
var hasClass, addClass, removeClass;
if ('classList' in document.documentElement) {
hasClass = function(elem, c) {
return elem.classList.contains(c);
};
addClass = function(elem, c) {
elem.classList.add(c);
};
removeClass = function(elem, c) {
elem.classList.remove(c);
};
}
else {
hasClass = function(elem, c) {
return classReg(c).test(elem.className);
};
addClass = function(elem, c) {
if (!hasClass(elem, c)) {
elem.className = elem.className + ' ' + c;
}
};
removeClass = function(elem, c) {
elem.className = elem.className.replace(classReg(c), ' ');
};
}
function toggleClass(elem, c) {
var fn = hasClass(elem, c) ? removeClass : addClass;
fn(elem, c);
}
var classie = {
// full names
hasClass: hasClass,
addClass: addClass,
removeClass: removeClass,
toggleClass: toggleClass,
// short names
has: hasClass,
add: addClass,
remove: removeClass,
toggle: toggleClass
};
// transport
if (typeof define === 'function' && define.amd) {
// AMD
define(classie);
} else {
// browser global
window.classie = classie;
}
})(window);
Und hier ist die JS für den Header:
function init() {
window.addEventListener('scroll', function(e){
var distanceY = window.pageYOffset || document.documentElement.scrollTop,
shrinkOn = 300,
header = document.querySelector("header");
if (distanceY > shrinkOn) {
classie.add(header,"smaller");
} else {
if (classie.has(header,"smaller")) {
classie.remove(header,"smaller");
}
}
});
}
window.onload = init();
Verwenden 'local/sessionStorage' – Rayon
Ich habe Beispiele für die Verwendung von local/sessionStorage gefunden, aber nichts, was adressiert, was ich damit zu tun versuche. Kannst du genauer sein? – Trishah