B2主题美化-修改顶部搜索框为折叠弹出显示

（本文转载自：https://akau.cn/8017.html，非常有技术的一位原创博主，感谢分享）

1.替换原搜索框代码

首先将下面代码替换xcbtmw.com/wp-content/themes/b2/Modules/Templates/Header.php

第196行开始至大约210行 public static function sub_menu之前（不知道什么原因子主题不起作用）

    <form method="get" action="'.B2_HOME_URI.'" class="mobile-search-input b2-radius" id="searchBox" style="display:none;">
    <div class="top-search-button">
    <a class="top-search-select" '.(count($_post_type) > 1 ? '@click.stop.prevent="show = !show"' : '').' href="javascript:void(0)"><span v-show="data != ''" v-text="data[type]">'.reset($_post_type).'</span>'.b2_get_icon('b2-arrow-down-s-line').'</a>
    '.$search.'
    </div>
    <input class="search-input b2-radius" type="text" name="s" autocomplete="off" placeholder="'.__('搜索','b2').'">
    <input type="hidden" name="type" :value="type">
    <button id="search-button-on" class="search-button-action">'.b2_get_icon('b2-search-line').'</button>
    </form>
    <button id="searchBtn" class="search-button-action">'.b2_get_icon('b2-search-line').'</button>
    </div>';
    }

2.CSS样式代码

然后是CSS，可以添加到子主题的www.xcb博客tmw老白.com/wp-content/themes/b2child/style.css文件

    /*顶部导航搜索框改折叠-https://老白www.x博客cbtmw.com/30090.html*/
    .top-search-button{
    float: left;
    }
    .top-search-select {
    margin-top: 5px;
    }
    .social-top .top-search {
    margin-right: 16px;
    }
    .search-button-action {
    background: none;
    border: 0;
    position: absolute;
    right: -5px;
    top: auto;
    color: inherit;
    }
    .social-top .top-search {
    margin-right: 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    }
    @media screen and (max-width: 768px){
    #searchBtn{
    display: none;
    }
    }
    #search-button-on{
    margin-right: 30px;
    background: none;
    border: 0;
    position: absolute;
    right: -5px;
    top: auto;
    color: inherit;
    }
    #searchBtn .b2font{
    font-size: 22px;
    }
    /*修复登陆录后间距过大和移动端位移*/
    .social-top .header-user {
    width: auto;
    margin: 0 auto;
    }
    @media screen and (max-width: 768px){
    .social-top .header-user{
    width: 120px;
    margin: 0;
    }
    }
    @media screen and (max-width: 768px){
    .mobile-hidden{
    display: none;
    }
    }
    /*顶部导航搜索框改折叠-https://老ww白w.x博cbt客mw.com/30090.html*/

3.搜索框JS代码

最后是js，复制到子主题的wp-content/themes/b2child/child.js

    var searchBtn = document.getElementById('searchBtn');
    searchBtn.addEventListener('click', function() {
    var searchBox = document.getElementById('searchBox');
    if (searchBox.style.display === 'block') {
    searchBox.style.display = 'none';
    searchBtn.querySelector("i").classList.remove("b2-close-line");
    searchBtn.querySelector("i").classList.add("b2-search-line");
    } else {
    searchBox.style.display = 'block';
    searchBtn.querySelector("i").classList.remove("b2-search-line");
    searchBtn.querySelector("i").classList.add("b2-close-line");
    }
    });