In-depth analysis of advanced applications of JavaScript's DOM-JS Tutorial-php.cn

This time I will bring you an in-depth advanced application of DOM in JavaScript. What are the precautions for advanced DOM applications using JavaScript? Here are practical cases. Let’s take a look. .

Changing colors on alternate rows

<html lang="en"><head>
    <meta charset="UTF-8">
    <title>04-表格的应用</title>
    <style>
        table{            margin: 100px auto;            width: 300px;            text-align: center;            background-color: black;
        }        table tr {            background-color: white;
        }    </style>
    <script>
        window.onload = function () {            var oTab = document.getElementById(&#39;tab1&#39;);            //获取第二行的&#39;张三&#39;//            alert( oTab.getElementsByTagName(&#39;tbody&#39;)[0].getElementsByTagName(&#39;tr&#39;)[1].getElementsByTagName(&#39;td&#39;)[1].innerHTML);
            //table独有的简单操作
            //上面的代码可以简写成下面的格式;//            alert( oTab.tBodies(&#39;tbody&#39;)[0].rows(&#39;tr&#39;)[1].cells(&#39;td&#39;)[1].innerHTML);
            /**
             *90年代,div+css没人用,人们用的几乎全是table,于是乎,就有了table的便捷操作.
             * tBodies(一个table里可以有多个tbody),tHead,tFoot,rows,cells等便捷操作
             * */
            //隔行变色
            var aRow = oTab.tBodies[0].rows;//            alert(aRow.length);
            //记录一下颜色
            var oldColor = null;            for(var i=0;i<aRow.length;i++){
                aRow[i].onmouseover = function () {                    //先记录一下之前的颜色
                    oldColor = this.style.backgroundColor;                    this.style.background = &#39;green&#39;;
                }
                aRow[i].onmouseout = function () {                    this.style.backgroundColor = oldColor;
                }                if (i%2){
                    aRow[i].style.background = &#39;&#39;;
                }else {
                    aRow[i].style.background = &#39;#ccc&#39;;
                }
            }
        }    </script></head><body><table id="tab1">
    <thead>
    <td>ID</td>
    <td>姓名</td>
    <td>年龄</td>
    </thead>
    <tbody>
    <tr>
        <td>1</td>
        <td>Blue</td>
        <td>27</td>
    </tr>
    <tr>
        <td>2</td>
        <td>张三</td>
        <td>32</td>
    </tr>
    <tr>
        <td>3</td>
        <td>李四</td>
        <td>17</td>
    </tr>
    <tr>
        <td>4</td>
        <td>王五</td>
        <td>28</td>
    </tr>
    <tr>
        <td>5</td>
        <td>张伟</td>
        <td>35</td>
    </tr>
    </tbody></table></body></html>

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2. Adding tables

Dynamic adding of tables

<html lang="en"><head>
    <meta charset="UTF-8">
    <title>04-表格的添加 删除</title>
    <style>
        #div1{            text-align: center;
        }        #div1 #form{            margin: 100px 0 10px;
        }        #div1 table{            margin: 0px auto;            width: 300px;            text-align: center;            background-color: black;
        }        table tr {            background-color: white;
        }    </style>
    <script>
        window.onload = function () {            var oTab = document.getElementById(&#39;tab1&#39;);            var oName = document.getElementById(&#39;name&#39;);            var oAge = document.getElementById(&#39;age&#39;);            var oBtn = document.getElementById(&#39;btn1&#39;);
            oBtn.onclick = function () {                var oTr = document.createElement(&#39;tr&#39;);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = oTab.tBodies[0].rows.length+1;
                oTr.appendChild(oTd);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = oName.value;
                oTr.appendChild(oTd);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = oAge.value;
                oTr.appendChild(oTd);                //注意:一定要添加到第0个tBodies上
                oTab.tBodies[0].appendChild(oTr);
            }
        }    </script></head><body><div id="div1">
    <div id="form">
        姓名:<input id="name" type="text">
        年龄:<input id="age" type="text">
        <input id="btn1" type="button" value="添加">
    </div>
    <table id="tab1">
        <thead>
        <td>ID</td>
        <td>姓名</td>
        <td>年龄</td>
        </thead>
        <tbody>
        <tr>
            <td>1</td>
            <td>Blue</td>
            <td>27</td>
        </tr>
        <tr>
            <td>2</td>
            <td>张三</td>
            <td>32</td>
        </tr>
        <tr>
            <td>3</td>
            <td>李四</td>
            <td>17</td>
        </tr>
        <tr>
            <td>4</td>
            <td>王五</td>
            <td>28</td>
        </tr>
        <tr>
            <td>5</td>
            <td>张伟</td>
            <td>35</td>
        </tr>
        </tbody>
    </table></div></body></html>

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3.Deleting tables

<html lang="en"><head>
    <meta charset="UTF-8">
    <title>05-表格的添加 删除</title>
    <style>
        #div1{            text-align: center;
        }        #div1 #form{            margin: 100px 0 10px;
        }        #div1 table{            margin: 0px auto;            width: 300px;            text-align: center;            background-color: black;
        }        table tr {            background-color: white;
        }    </style>
    <script>
        window.onload = function () {            var oTab = document.getElementById(&#39;tab1&#39;);            var oName = document.getElementById(&#39;name&#39;);            var oAge = document.getElementById(&#39;age&#39;);            var oBtn = document.getElementById(&#39;btn1&#39;);            //行数
            var vRow = oTab.tBodies[0].rows.length+1;
            oBtn.onclick = function () {                var oTr = document.createElement(&#39;tr&#39;);
                vRow++;                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = vRow;
                oTr.appendChild(oTd);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = oName.value;
                oTr.appendChild(oTd);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = oAge.value;
                oTr.appendChild(oTd);                var oTd = document.createElement(&#39;td&#39;);
                oTd.innerHTML = &#39;<a href="javaScript:;">删除</a>&#39;;
                oTr.appendChild(oTd);
                oTd.getElementsByTagName(&#39;a&#39;)[0].onclick = function () {                    //注意:一定要从第0个tBodies上删除.
                    //this.parentNode 指的是 td
                    //this.parentNode.parentNode 指的是 tr
                    oTab.tBodies[0].removeChild(this.parentNode.parentNode);
                };                //注意:一定要添加到第0个tBodies上
                oTab.tBodies[0].appendChild(oTr);
            }
        }    </script></head><body><div id="div1">
    <div id="form">
        姓名:<input id="name" type="text">
        年龄:<input id="age" type="text">
        <input id="btn1" type="button" value="添加">
    </div>
    <table id="tab1">
        <thead>
        <td>ID</td>
        <td>姓名</td>
        <td>年龄</td>
        <td>操作</td>
        </thead>
        <tbody>
        <tr>
            <td>1</td>
            <td>Blue</td>
            <td>27</td>
            <td></td>
        </tr>
        <tr>
            <td>2</td>
            <td>张三</td>
            <td>32</td>
            <td></td>
        </tr>
        <tr>
            <td>3</td>
            <td>李四</td>
            <td>17</td>
            <td></td>
        </tr>
        <tr>
            <td>4</td>
            <td>王五</td>
            <td>28</td>
            <td></td>
        </tr>
        <tr>
            <td>5</td>
            <td>张伟</td>
            <td>35</td>
            <td></td>
        </tr>
        </tbody>
    </table></div></body></html>

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4 .Table search

Ignore case, fuzzy search, multi-keyword search
toLowerCase() Convert the string to all lowercase;
Fuzzy search search When found, return the position ;Not found, returns -1;

<html lang="en"><head>
    <meta charset="UTF-8">
    <title>06-表格的搜索</title>
    <style>
        #div1{            text-align: center;
        }        #div1 #form{            margin: 100px 0 10px;
        }        #div1 table{            margin: 0px auto;            width: 300px;            text-align: center;            background-color: black;
        }        table tr {            background-color: white;
        }    </style>
    <script>
        window.onload = function () {            var oTab = document.getElementById(&#39;tab1&#39;);            var oTxt = document.getElementById(&#39;name&#39;);            var oBtn = document.getElementById(&#39;btn1&#39;);
            oBtn.onclick = function () {                for (var i=0;i<oTab.tBodies[0].rows.length;i++){                    //忽略大小写
                    //toLowerCase() 把字符串转成全小写的形式;
                    //把if里面两边都转成全小写的形式;
                    var sTab = oTab.tBodies[0].rows[i].cells[1].innerHTML.toLowerCase();                    var sTxt = oTxt.value.toLowerCase();                    //模糊搜索 search 当找到的时候,返回位置;找不到,返回-1
                    //search()
                    //多关键字搜索
                    //假设多个关键字之间用 空格 隔开的,以后可以使用正则表达式
                    var arr = sTxt.split(&#39; &#39;);                    //先把背景颜色重置
                    oTab.tBodies[0].rows[i].style.backgroundColor = &#39;&#39;;                    for (var j=0;j<arr.length;++j){                        if (sTab.search(arr[j]) != -1){
                            oTab.tBodies[0].rows[i].style.backgroundColor = &#39;yellow&#39;;
                        }
                    }
                }
            }
        }    </script></head><body><div id="div1">
    <div id="form">
        姓名:<input id="name" type="text">
        <input id="btn1" type="button" value="搜索">
    </div>
    <table id="tab1">
        <thead>
        <td>ID</td>
        <td>姓名</td>
        <td>年龄</td>
        <td>操作</td>
        </thead>
        <tbody>
        <tr>
            <td>1</td>
            <td>Blue</td>
            <td>27</td>
            <td></td>
        </tr>
        <tr>
            <td>2</td>
            <td>张三</td>
            <td>32</td>
            <td></td>
        </tr>
        <tr>
            <td>3</td>
            <td>李四</td>
            <td>17</td>
            <td></td>
        </tr>
        <tr>
            <td>4</td>
            <td>王五</td>
            <td>28</td>
            <td></td>
        </tr>
        <tr>
            <td>5</td>
            <td>张伟</td>
            <td>35</td>
            <td></td>
        </tr>
        </tbody>
    </table></div></body></html>

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5. Sorting

<html lang="en"><head>
    <meta charset="UTF-8">
    <title>08-排序</title>
    <script>
        window.onload = function () {            var btn = document.getElementById(&#39;btn1&#39;);            var oUl = document.getElementById(&#39;ul1&#39;);
            btn.onclick = function () {                //先初始化数组
                var arr = [];                for (var i=0;i<oUl.children.length;i++){
                   arr.push(oUl.children[i]);                    //排序
                    arr.sort(function (li1,li2) {                        //最好不要依赖隐式类型转换,提前给强转下
                        var n1 = parseInt(li1.innerHTML);                        var n2 = parseInt(li2.innerHTML);                        return n1-n2;
                    })
                }                //再重新添加
                for(var i=0;i<arr.length;i++){
                    oUl.appendChild(arr[i]);
                }
            }
        }    </script></head><body><input id="btn1" type="button" value="排序"><ul id="ul1">
    <li>34</li>
    <li>25</li>
    <li>9</li>
    <li>88</li>
    <li>54</li></ul></body></html>

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<html lang="en"><head>
    <meta charset="UTF-8">
    <title>06-表格的排序</title>
    <style>
        #div1{            text-align: center;
        }        #div1 #form{            margin: 100px 0 10px;
        }        #div1 table{            margin: 0px auto;            width: 300px;            text-align: center;            background-color: black;
        }        table tr {            background-color: white;
        }    </style>
    <script>
        window.onload = function () {            var oTab = document.getElementById(&#39;tab1&#39;);            var oBtn = document.getElementById(&#39;btn1&#39;);
            oBtn.onclick = function () {                //aTr是个集合,他没有sort()这个方法
                var aTr = oTab.tBodies[0].rows;                //把tr放到一个数组里面
                var arr = [];                for(var i=0;i<aTr.length;i++){
                    arr.push(aTr[i]);
                }                //排序
                arr.sort(function (tr1, tr2) {                    var n1 = parseInt(tr1.cells[0].innerHTML);                    var n2 = parseInt(tr2.cells[0].innerHTML);                    return n1-n2;
                })                //添加
                for (var i=0;i<arr.length;i++){
                    oTab.tBodies[0].appendChild(arr[i]);
                }
            }
 
        }    </script></head><body><div id="div1">
    <div id="form">
        <input id="btn1" type="button" value="排序">
    </div>
    <table id="tab1">
        <thead>
        <td>ID</td>
        <td>姓名</td>
        <td>年龄</td>
        <td>操作</td>
        </thead>
 
        <tbody>
        <tr>
            <td>2</td>
            <td>张三</td>
            <td>32</td>
            <td></td>
        </tr>
        <tr>
            <td>4</td>
            <td>王五</td>
            <td>28</td>
            <td></td>
        </tr>
        <tr>
            <td>5</td>
            <td>张伟</td>
            <td>35</td>
            <td></td>
        </tr>
        <tr>
            <td>1</td>
            <td>Blue</td>
            <td>27</td>
            <td></td>
        </tr>
        <tr>
            <td>3</td>
            <td>李四</td>
            <td>17</td>
            <td></td>
        </tr>
        </tbody>
    </table></div></body></html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!