Lost's Blog

Manual Dark Mode

 
  • Jan 06, 2023
  • 0 views

直接了当

本Blog右上角的那个小月亮或者小太阳可以手动自由切换不是吗，稍微谈谈用了什么骚方法改的，以及需要注意什么，参考代码是How to override css prefers-color-scheme setting中的第一个回答

首先需要看看模板是怎么实现的，找了半天发现是纯scss，css的媒体查询，现在需要手动，于是乎改_properties.scss：

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[data-theme="dark"] {
  @each $name, $value in $dark {
    --#{$name}: #{$value};
  }
}

// @media (prefers-color-scheme: dark) {
//   :root {
//     @each $name, $value in $dark {
//       --#{$name}: #{$value};
//     }
//   }
// }

然后需要JS来判断，看看哪里能写，按照模板文档，页面全部都是page的子类，page.js是空的，而且确定被page.html引入了，就直接写里面好了：

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function getTheme() {
    var theme = "light";    //default to light

    //local storage is used to override OS theme settings
    if (localStorage.getItem("theme")) {
        if (localStorage.getItem("theme") == "dark") {
            var theme = "dark";
        }
    } else if (!window.matchMedia) {
        //matchMedia method not supported
        return false;
    } else if (window.matchMedia("(prefers-color-scheme: dark)").matches) {
        //OS theme setting detected as dark
        var theme = "dark";
    }
    return theme;
}

function initTheme() {
    //dark theme preferred, set document with a `data-theme` attribute
    if (getTheme() == "dark") {
        document.documentElement.setAttribute("data-theme", "dark");
    }
}
initTheme();

function initThemeSwitch() {
    if (getTheme() == "dark") {
        document.getElementById("themeSwitch1").className = "fas fa-sun";
        document.getElementById("themeSwitch2").className = "fas fa-sun";
    }
}

function toggleTheme() {
    if (localStorage.getItem("theme") == "dark") {
        localStorage.setItem("theme", "light");
        document.documentElement.setAttribute("data-theme", "light");
        document.getElementById("themeSwitch1").className = "fas fa-moon";
        document.getElementById("themeSwitch2").className = "fas fa-moon";
    } else {
        localStorage.setItem("theme", "dark");
        document.documentElement.setAttribute("data-theme", "dark");
        document.getElementById("themeSwitch1").className = "fas fa-sun";
        document.getElementById("themeSwitch2").className = "fas fa-sun";
    }
}

然后请注意，page.html也要改改，要把<script>{ %- include scripts/page.js -% }</script>放到最前面去1，也就是DOM加载前需要运行page.js，还要在DOM加载完后的<script>标签里写一个initThemeSwitch();

最后把图标放进header.html就行，注意有两处，应该是移动端和大屏端两种：

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<button class="button button--secondary button--circle search-button" onclick="toggleTheme()"><i id="themeSwitch1" class="fas fa-moon"></i></button>
<button class="button button--secondary button--circle search-button js-search-toggle"><i class="fas fa-search"></i></button>

......

<li><button class="button button--secondary button--circle search-button" onclick="toggleTheme()"><i id="themeSwitch2" class="fas fa-moon"></i></button></li>
<li><button class="button button--secondary button--circle search-button js-search-toggle"><i class="fas fa-search"></i></button></li>

补充说明

为什么要调整JS运行顺序呢，因为这样美观（否则在暗黑模式下，刷新或者切换页面会有一丢丢的白天模式的残影闪过，强迫症很难受

那直接放前面就好了啊，为什么要分开呢？因为DOM没加载完也改不了那两个按钮的class啊，这是遗憾的地方（眼力够好还是能发现一点点图标切换的残影）

有更好的办法快告诉我（

  1. 这里花括号两边多了两个空格，否则会被编译（什么注入漏洞 ↩

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