JavaScript原生实现实时搜索（基础版）

最新推荐文章于 2022-07-10 09:17:14 发布

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最新推荐文章于 2022-07-10 09:17:14 发布

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分类专栏： JavaScript原生案例文章标签： JavaScript JavaScript原生 JavaScript实时搜索 JavaScript搜索

本文链接：https://blog.youkuaiyun.com/shenkeding9350/article/details/80142481

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            padding: 0;
            margin: 0;
        }
        li{
            list-style: none;
            padding-left: 5px;
            margin-top: 5px;
        }

        #box {
            width: 450px;
            margin: 200px auto;
        }

        #txt {
            width: 350px;
        }

        #ul {
            width: 350px;
            border: 1px solid red;
            display: none;
        }

        #ul.show {
            display: block;
        }
    </style>
</head>
<body>

<div id="box">
    <input type="text" id="txt" value="">
    <input type="button" value="搜索" id="btn">
    <ul id="ul">

    </ul>

</div>


<script>

    // 定义新数组
    var keyWords =
        [{"word": "javascript:", "resrc": "ori", "source": ""}, {
            "word": "javascript手册",
            "resrc": "ori",
            "source": ""
        }, {"word": "javascript下载", "resrc": "ori", "source": ""}, {
            "word": "javascript基础教程",
            "resrc": "ori",
            "source": ""
        }, {"word": "javascript入门教程", "resrc": "ori", "source": ""}, {
            "word": "javascript:void 0",
            "resrc": "ori",
            "source": ""
        }, {"word": "javascript:closedialog", "resrc": "ori", "source": ""}, {
            "word": "javascript是什么",
            "resrc": "ori",
            "source": ""
        }, {"word": "javascript教程", "resrc": "ori", "source": ""}, {
            "word": "javascript官网下载",
            "resrc": "ori",
            "source": ""
        }];

    //获取文本框注册键盘抬起事件
    $("txt").addEventListener("keyup", function () {
        //按下之前先显示ul
        $("ul").className += " " + "show";
        // 每次按下之前清空ul里面的所有节点
        $("ul").innerHTML = "";
        //新建空数组准备放置筛选出的字符串
        var tmp = [];
        for (var i = 0; i < keyWords.length; i++) {
            //此处使用toUppenCase()转换是为了让搜索不区分大小写
            if (keyWords[i].word.toUpperCase().indexOf(this.value.toUpperCase()) == 0 && this.value.length != 0) {
                tmp.push(keyWords[i]);
            }
        }
        //输出数组，查看是否异常
        console.log(tmp);

        // 判断是否输入空字符或者删掉所有东西
        if (this.value.length == 0 || tmp.length == 0) {
            $("ul").className = "";
        }

        // 循环创建li并且插入到ul中
        for (var j = 0; j < tmp.length; j++) {
            var li = document.createElement("li");
            setInnerText(li, tmp[j].word);
            $("ul").appendChild(li)
        }
    }, false)


    function $(id) {
        return document.getElementById(id);
    }

    function setInnerText(ele, txt) {
        return ele.textContent ? ele.textContent = txt : ele.innerText = txt;
    }
</script>

</body>
</html>