为博客添加返回顶部按钮
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为博客添加返回顶部按钮
适用于WordPress
由于主题没有自带的返回顶部按钮,所以我一直在寻找一种解决方案。之前使用的是wordpress插件提供的返回顶部按钮,后来在网上乱逛,发现有Xnces – 衔铁部落的返回顶部按钮非常的酷炫,正是我要寻找的。于是,我在那个博客下留言询问制作方法。 前几天,看到那个博客上出现了一篇文章-本博客的返回顶部效果。 按照上面的方法,折腾一会儿,我也制作出来了,特地记录一下。
首先,先加载一下环境。在后台
functions.php
中找到ms_scripts()
函数,添加wp_enqueue_script( 'jquery' );
调用wordpress默认的JQuery文件。我将这个效果有关的js代码放在了主题目录下新建的
themes.js
文件中。所以在上面的函数中添加下面两句话导入这个文件wp_register_script( 'themes_js', THEMEPATH . '/themes.js',array());
和wp_enqueue_script( 'themes_js' );
CSS代码我直接加在了主题
style.css
中。重新打开网站就能看到效果了。
themes.js
文件中代码如下
var bigfa_scroll = {
drawCircle: function(id, percentage, color) {
var width = jQuery(id).width();
var height = jQuery(id).height();
var radius = parseInt(width / 2.20);
var position = width;
var positionBy2 = position / 2;
var bg = jQuery(id)[0];
id = id.split("#");
var ctx = bg.getContext("2d");
var imd = null;
var circ = Math.PI * 2;
var quart = Math.PI / 2;
ctx.clearRect(0, 0, width, height);
ctx.beginPath();
ctx.strokeStyle = color;
ctx.lineCap = "square";
ctx.closePath();
ctx.fill();
ctx.lineWidth = 3;
imd = ctx.getImageData(0, 0, position, position);
var draw = function(current, ctxPass) {
ctxPass.putImageData(imd, 0, 0);
ctxPass.beginPath();
ctxPass.arc(positionBy2, positionBy2, radius, -(quart), ((circ) * current) - quart, false);
ctxPass.stroke();
}
draw(percentage / 100, ctx);
},
backToTop: function($this) {
$this.click(function() {
jQuery("body,html").animate({
scrollTop: 0
},
800);
return false;
});
},
scrollHook: function($this, color) {
color = color ? color: "#000000";
$this.scroll(function() {
var docHeight = (jQuery(document).height() - jQuery(window).height()),
$windowObj = $this,
$per = jQuery(".per"),
percentage = 0;
defaultScroll = $windowObj.scrollTop();
percentage = parseInt((defaultScroll / docHeight) * 100);
var backToTop = jQuery("#backtoTop");
if (backToTop.length > 0) {
if ($windowObj.scrollTop() > 200) {
backToTop.addClass("button--show");
} else {
backToTop.removeClass("button--show");
}
$per.attr("data-percent", percentage);
bigfa_scroll.drawCircle("#backtoTopCanvas", percentage, color);
}
});
}
}
jQuery(document).ready(function() {
jQuery("body").append('<div id="backtoTop" data-action="gototop"><canvas id="backtoTopCanvas" width="48" height="48"></canvas><div class="per"></div></div>');
var T = bigfa_scroll;
T.backToTop(jQuery("#backtoTop"));
T.scrollHook(jQuery(window), "#555555");
});
CSS文件要添加的代码
#backtoTop{
background-color:#eee;
border-radius:100%;
bottom:10%;height:48px;
position:fixed;
right:-100px;
width:48px;
transition:0.5s;
-webkit-transition:0.5s
}
#backtoTop.button--show{
right:10px
}
.per{
font-size:16px;
height:48px;
line-height:48px;
position:absolute;
text-align:center;
top:0;
width:48px;
color:#555;
cursor:pointer
}
.per:before{
content:attr(data-percent)
}
.per:hover:before{
content:"↑";font-size:20px
}
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