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('tab1'); //获取第二行的'张三'// alert( oTab.getElementsByTagName('tbody')[0].getElementsByTagName('tr')[1].getElementsByTagName('td')[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('tbody')[0].rows('tr')[1].cells('td')[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 = 'green';
}
aRow[i].onmouseout = function () { this.style.backgroundColor = oldColor;
} if (i%2){
aRow[i].style.background = '';
}else {
aRow[i].style.background = '#ccc';
}
}
} </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>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('tab1'); var oName = document.getElementById('name'); var oAge = document.getElementById('age'); var oBtn = document.getElementById('btn1');
oBtn.onclick = function () { var oTr = document.createElement('tr'); var oTd = document.createElement('td');
oTd.innerHTML = oTab.tBodies[0].rows.length+1;
oTr.appendChild(oTd); var oTd = document.createElement('td');
oTd.innerHTML = oName.value;
oTr.appendChild(oTd); var oTd = document.createElement('td');
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>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('tab1'); var oName = document.getElementById('name'); var oAge = document.getElementById('age'); var oBtn = document.getElementById('btn1'); //行数
var vRow = oTab.tBodies[0].rows.length+1;
oBtn.onclick = function () { var oTr = document.createElement('tr');
vRow++; var oTd = document.createElement('td');
oTd.innerHTML = vRow;
oTr.appendChild(oTd); var oTd = document.createElement('td');
oTd.innerHTML = oName.value;
oTr.appendChild(oTd); var oTd = document.createElement('td');
oTd.innerHTML = oAge.value;
oTr.appendChild(oTd); var oTd = document.createElement('td');
oTd.innerHTML = '<a href="javaScript:;">删除</a>';
oTr.appendChild(oTd);
oTd.getElementsByTagName('a')[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>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('tab1'); var oTxt = document.getElementById('name'); var oBtn = document.getElementById('btn1');
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(' '); //先把背景颜色重置
oTab.tBodies[0].rows[i].style.backgroundColor = ''; for (var j=0;j<arr.length;++j){ if (sTab.search(arr[j]) != -1){
oTab.tBodies[0].rows[i].style.backgroundColor = 'yellow';
}
}
}
}
} </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>5. Sorting
<html lang="en"><head>
<meta charset="UTF-8">
<title>08-排序</title>
<script>
window.onload = function () { var btn = document.getElementById('btn1'); var oUl = document.getElementById('ul1');
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><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('tab1'); var oBtn = document.getElementById('btn1');
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>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!
Recommended reading:
In-depth basic application of JavaScript
##8 basic knowledge that must be paid attention to in JS
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