DOM高级（一）
- 获取表格元素：tBodies、rows、cells
<script>
window.onload=function ()
{
var oTab=document.getElementById('tab1');
//alert(oTab.getElementsByTagName('tbody')[0].getElementsByTagName('tr')[2].getElementsByTagName('td')[1].innerHTML);
alert(oTab.tBodies[0].rows[2].cells[1].innerHTML);
};
</script>
</head>
<body>
<table id="tab1" border="1" width="400">
<thead>
<td>ID</td>
<td>姓名</td>
<td>操作</td>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Blue</td>
<td></td>
</tr>
<tr>
<td>2</td>
<td>Leo</td>
<td></td>
</tr>
</tbody>
</table>
</body>
- 表格中 tBodies 的意义
- 表格隔行换色实例
<script>
window.onload=function ()
{
var oTab=document.getElementById('tab1');
var i=0;
for(i=0;i<oTab.tBodies[0].rows.length;i++)
{
oTab.tBodies[0].rows[i].style.background=i%2?'#CCC':'';
}
};
</script>
</head>
<body>
- 表格添加、删除实例
<script>
window.onload=function ()
{
var oTab=document.getElementById('tab1');
var oBtn=document.getElementById('btn1');
var oTxt=document.getElementById('txt1');
oBtn.onclick=function ()
{
var oTr=document.createElement('tr');
var oTd=null;
oTd=document.createElement('td');
oTd.innerHTML=oTab.tBodies[0].rows.length+1;
oTr.appendChild(oTd);
oTd=document.createElement('td');
oTd.innerHTML=oTxt.value;
oTr.appendChild(oTd);
oTd=document.createElement('td');
oTd.innerHTML=' ';
oTr.appendChild(oTd);
oTab.tBodies[0].appendChild(oTr);
};
};
</script>
</head>
<body>
<input id="txt1" type="text" />
<input id="btn1" type="button" value="添加" />
<table id="tab1" border="1" width="400">
<thead>
<td>ID</td>
<td>姓名</td>
<td>操作</td>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Blue</td>
<td></td>
</tr>
....
删除
<script>
window.onload=function ()
{
var oTab=document.getElementById('tab1');
var oBtn=document.getElementById('btn1');
var oTxt=document.getElementById('txt1');
var iNowId=oTab.tBodies[0].rows.length+1;
oBtn.onclick=function ()
{
var oTr=document.createElement('tr');
var oTd=null;
oTd=document.createElement('td');
oTd.innerHTML=iNowId++;
oTr.appendChild(oTd);
oTd=document.createElement('td');
oTd.innerHTML=oTxt.value;
oTr.appendChild(oTd);
oTd=document.createElement('td');
oTd.innerHTML='<a href="javascript:;">删除</a>';
oTr.appendChild(oTd);
oTd.getElementsByTagName('a')[0].onclick=function ()
{
oTab.tBodies[0].removeChild(this.parentNode.parentNode);
};
oTab.tBodies[0].appendChild(oTr);
};
};
</script>
</head>
<body>
<input id="txt1" type="text" />
<input id="btn1" type="button" value="添加" />
<table id="tab1" border="1" width="400">
<thead>
<td>ID</td>
<td>姓名</td>
<td>操作</td>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Blue</td>
<td></td>
</tr>
- 修复删除的问题
- 表格搜索实例
<script>
window.onload=function ()
{
var oBtn=document.getElementById('btn1');
var oTab=document.getElementById('tab1');
var oTxt=document.getElementById('txt1');
oBtn.onclick=function ()
{
var i=0;
for(i=0;i<oTab.tBodies[0].rows.length;i++)
{
var sValueInTab=oTab.tBodies[0].rows[i].cells[1].innerHTML.toLowerCase();
var sValueInTxt=oTxt.value.toLowerCase();
if(sValueInTab==sValueInTxt)
{
oTab.tBodies[0].rows[i].style.background='yellow';
}
else
{
oTab.tBodies[0].rows[i].style.background='';
}
}
};
};
</script>
- 消除大小写字母的问题
<script>
var a='aaa';
var b='AaA';
alert(a.toLowerCase()==b.toLowerCase());
</script>
- 解决多个关键字搜索的问题
<script>
window.onload=function ()
{
var oBtn=document.getElementById('btn1');
var oTab=document.getElementById('tab1');
var oTxt=document.getElementById('txt1');
oBtn.onclick=function ()
{
var i=0;
for(i=0;i<oTab.tBodies[0].rows.length;i++)
{
var sValueInTab=oTab.tBodies[0].rows[i].cells[1].innerHTML.toLowerCase();
var sValueInTxt=oTxt.value.toLowerCase();
var arr=sValueInTxt.split(' ');
var bFound=false;
for(var j=0;j<arr.length;j++)
{
if(sValueInTab.search(arr[j])!=-1)
{
bFound=true;
break;
}
}
if(bFound)
{
oTab.tBodies[0].rows[i].style.background='yellow';
}
else
{
oTab.tBodies[0].rows[i].style.background='';
}
}
};
};
</script>
</head>
<body>
<input id="txt1" type="text" />
<input id="btn1" type="button" value="搜索" />
<table id="tab1" border="1" width="400">
<thead>
<td>ID</td>
<td>姓名</td>
<td>操作</td>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Blue</td>
<td></td>
</tr>
<tr>
<td>2</td>
<td>Leo</td>
<td></td>
</tr>
<title>高亮显示</title>
<script>
window.onload=function ()
{
var oTab=document.getElementById('tab1');
var oldBgColor='';
var i=0;
for(i=0;i<oTab.tBodies[0].rows.length;i++)
{
oTab.tBodies[0].rows[i].style.background=i%2?'#CCC':'';
oTab.tBodies[0].rows[i].onmouseover=function ()
{
oldBgColor=this.style.background;
this.style.background='yellow';
};
oTab.tBodies[0].rows[i].onmouseout=function ()
{
this.style.background=oldBgColor;
};
}
};
</script>
</head>
<body>
<table id="tab1" border="1" width="400">
<thead>
<td>ID</td>
<td>姓名</td>
<td>操作</td>
</thead>
<tbody>
<tr>
<td>1</td>
<td>Blue</td>
<td></td>
</tr>
<tr>
<td>2</td>
<td>Leo</td>
<td></td>
</tr>
<tr>
<td>3</td>
<td>莫莫</td>
<td></td>
</tr>
<tr>
<td>4</td>
<td>aaa</td>
<td></td>
</tr>
<tr>
<td>5</td>
<td>bbb</td>
<td></td>
</tr>
<tr>
<td>6</td>
<td>ccc</td>
<td></td>
</tr>
</tbody>
</table>
</body>
<title>A在字符串里找到没有</title>
<script>
var str='blue leo';
var arr=str.split(' ');// arr=['blue','leo']
var str2='leo is a person';
var bFound=false;//没有找到
for(i=0;i<arr.length;i++)
{
if(str2.search(arr[i])!=-1) //(字符串在数组里没有)非，就是有，然后设为true,
{
bFound=true;
break;
}
}
alert(bFound);
</script>
<script>
var str='abcdef';
alert(str.search('u')); //-1 ,如果有，第一位就返回0
</script>
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