[英]increase / decrease font size and store in cookie
我需要一個腳本來增加和減少 fonts 但仍然是用戶返回站點時設置的值。 我相信這應該由 cookie 來完成。 我找到了一個例子,但是當我把它付諸實踐時,什么也沒有發生。 當我點擊 A + (increaseFont) 時沒有任何反應。 按照網站下面的腳本: https://erika.codes/jquery/increase-decrease-page-font-size-jquery/
<script src='https://cdnjs.cloudflare.com/ajax/libs/jquery/1.12.4/jquery.min.js'></script>
<script src="https://cdn.jsdelivr.net/npm/js-cookie@rc/dist/js.cookie.min.js"></script>
<div>
<span class="increaseFont">A+</span>
<span class="decreaseFont">A-</span>
<span class="resetFont">Aa</span>
</div>
<script>
var fontResize = {
textresize : function(){
var $cookie_name = "eip-FontSize";
var originalFontSize = $("html").css("font-size");
$.cookie($cookie_name, originalFontSize, { expires: 7, path: '/' });
// if exists load saved value, otherwise store it
if($.cookie($cookie_name)) {
var $getSize = $.cookie($cookie_name);
$("html").css({fontSize : $getSize + ($getSize.indexOf("px")!=-1 ? "" : "px")}); // IE fix for double "pxpx" error
} else {
$.cookie($cookie_name, originalFontSize);
//$.cookie($cookie_name, originalFontSize, {expires: 7, path: '/' });
}
// reset font size
$(".resetFont").bind("click", function() {
$("html").css("font-size", originalFontSize);
$.cookie($cookie_name, originalFontSize);
//$.cookie($cookie_name, originalFontSize, { expires: 7, path: '/' });
});
// function to increase font size
$(".increaseFont").bind("click", function() {
var currentFontSize = $("html").css("font-size");
var currentFontSizeNum = parseFloat(currentFontSize, 10);
var newFontSize = currentFontSizeNum*1.05;
//var newFontSize = currentFontSizeNum + 2;
if (newFontSize, 11) {
$("html").css("font-size", newFontSize);
$.cookie($cookie_name, newFontSize);
//$.cookie($cookie_name, newFontSize, { expires: 7, path: '/' });
}
return false;
});
// function to decrease font size
$(".decreaseFont").bind("click", function() {
var currentFontSize = $("html").css("font-size");
var currentFontSizeNum = parseFloat(currentFontSize, 10);
var newFontSize = currentFontSizeNum*0.95;
if (newFontSize, 11) {
$("html").css("font-size", newFontSize);
$.cookie($cookie_name, newFontSize);
//$.cookie($cookie_name, newFontSize, { expires: 7, path: '/' });
}
return false;
});
}
}
$(document).ready(function(){
fontResize.textresize();
})
</script>
*我發現另一個有效但沒有cookie的例子,當頁面更新時,值恢復正常: https://jsfiddle.net/pairdocs/yq8Le0gn/4/
body
設置為font-size: 16px;
em
或rem
。body
並查看所有其他元素相應調整。-/+
按鈕 const EL_body = document.querySelector("body"); const ELS_fontSize = document.querySelectorAll(".fontSize"); localStorage.fontSize = localStorage.fontSize || 16; // Read or default to 16px function changeSize() { EL_body.style.fontSize = `${localStorage.fontSize}px`; } ELS_fontSize.forEach(el => el.addEventListener("click", function() { localStorage.fontSize = parseInt(localStorage.fontSize) + parseInt(el.value); changeSize(); })); // Change size on subsequent page load changeSize();
<button class="fontSize" type="button" value="-2">A-</button> <button class="fontSize" type="button" value="2">A+</button> <h1>Lorem ipsum...</h1> <p>Lorem ipsum...</p>
const EL_body = document.querySelector("body");
const ELS_fontSize = document.querySelectorAll("[name='fontSize']");
localStorage.fontSize = localStorage.fontSize || 16; // Read or default to 16px
function changeSize() {
ELS_fontSize.forEach(el => el.checked = el.value === localStorage.fontSize);
EL_body.style.fontSize = `${localStorage.fontSize}px`;
}
ELS_fontSize.forEach(el => el.addEventListener("change", function() {
localStorage.fontSize = el.value;
changeSize();
}));
// Change size on subsequent page load
changeSize();
[name="fontSize"]+span {
display: inline-block;
padding: 5px 10px;
border: 1px solid currentColor;
}
[name="fontSize"]:checked+span {
color: #0bf;
}
<label><input type="radio" name="fontSize" value="14" hidden><span>A-</span></label>
<label><input type="radio" name="fontSize" value="16" hidden checked><span>A</span></label>
<label><input type="radio" name="fontSize" value="18" hidden><span>A+</span></label>
<h1>Lorem ipsum...</h1>
<p>Lorem ipsum...</p>
const EL_body = document.querySelector("body");
const EL_fontSize = document.querySelector("#fontSize");
localStorage.fontSize = localStorage.fontSize || 16; // Read or default to 16px
function changeSize() {
EL_fontSize.value = localStorage.fontSize; // Update select value;
EL_body .style.fontSize = `${localStorage.fontSize}px`;
}
EL_fontSize .addEventListener("change", function() {
localStorage.fontSize = this.value;
changeSize();
});
// Change size on subsequent page load
changeSize();
<select id="fontSize">
<option value="14">Small</option>
<option value="16">Normal</option>
<option value="18">Big</option>
</select>
<h1>Lorem ipsum...</h1>
<p>Lorem ipsum...</p>
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