HTM中几个常用的Element的Javascript用法（Form，Table，List）-优快云博客

本文介绍了使用HTML创建表单及表格的基本方法，并演示了如何通过JavaScript进行表单验证及表格元素的操作，包括插入、删除行及单元格内容的修改。

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Form in HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>A sample Form Using Get</title>
</head>
<body BGCOLOR="#FDF5E6">
	<h2 Align="center">A Sample Form Using Get</h2>
	<form id="infoForm" method="get" action="parameters">
		First name: <input id="firstName" type="text" name="firstName"
			value="Jingyang" /><br /> Last name: <input id="lastName" type="text"
			name="lastName" value="Yu" />
		<p />

		<input type="radio" name="sex" id="male" value="male"/>Male<br /> <input
			type="radio" name="sex" id="female" value="female"/>Female
		<p />

		<input type="checkbox" name="vehicle" value="Bike" id="bike" />I have
		a bike<br /> <input type="checkbox" name="vehicle" value="Car"
			id="car" onclick="displayCarSelect()" />I have a car <select
			name="cars" style="display: none" id="carSelect">
			<option value="volvo">Volve</option>
			<option value="audi">Audi</option>
			<option value="bmw">BMW</option>
			<option value="vw">VW</option>
		</select>
		<p />
		<p />

		<input type="button" value="submit" id="sub"/>
	</form>
</body>
</html>

	<script type="text/javascript">
		function displayCarSelect() {
			if (document.getElementById("car").checked)
				document.getElementById("carSelect").style.display = "block";
			else
				document.getElementById("carSelect").style.display = "none";
		}

		function trim(s) {
			return s.replace(/^\s*/, "").replace(/\s*$/, "");
		}

		function check() {
			var firstName = document.getElementById("firstName").value;

			var form = document.getElementById("infoForm");
			var lastName = form.lastName.value;
			var error = "";

			if (trim(firstName) == null || trim(firstName) == "") {
				error += "\n first name can not be empty";
				form.firstName.focus();
			}
			if (trim(lastName) == null || trim(lastName) == "") {
				error += "\n last name can not be empty";
				form.lastName.focus();
			}
			
			if(!document.getElementById("male").checked&&!document.getElementById("female").checked){
				error+="\n please select your sex";
			}
			if (error != "") {
				alert(error);
			} else {
				form.submit();
			}
		}
		document.getElementById("sub").onclick=check;
	</script>

Table in HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>access table element</title>
</head>
<body>
<div id="change">
Change the
<input id="rowToChange" type="number" size="2"/> row,
the <input id="colToChange" type="number" size="2" /> column with the value
<input id="value" type="text" size="16"/>   
<input id="btnChange" type="button" value="Change" onclick="change()"/>
</div>
<br/><br/>
<div id="insert">
Insert in the
<input id="rowToInsert" type="number" size="2"/> row,
with the First name: 
<input id="firstName" type="text" size="16"/> and the 
Last name: 
<input id="lastName" type="text" size="16"/>     

<input id="btnInsert" type="button" value="Insert" onclick="insert()"/>
</div>
<br/><br/>
<div id="delete">
Delete the
<input id="rowToDelete" type="number" size="2"/> row 
<input id="btnDelete" type="button" value="Delete" onclick="deleteRow()"/>
</div>
<br/><br/>
<div id="table">
<table id="t" border="1">
<caption>Name Table</caption>
<thead>
	<tr>
		<th>First Name</th>
		<th>Last Name</th>
	</tr>
</thead>
<tr>
	<td>Jingyang</td>
	<td>Yu</td>
</tr>
<tr>
	<td>Yufeng</td>
	<td>Guo</td>
</tr>
<tr>
	<td>Christian</td>
	<td>Meier</td>
</tr>
</table>
</div>
<br/><br/>
<div id="getValue">
Display the
<input id="rowToSelect" type="number" size="2"/> row,
the <input id="colToSelect" type="number" size="2" /> column with the value
<input id="btnGet" type="button" value="Get" onclick="get()"/><br/>
<textarea id="textForSelect" rows="2" cols="10" readonly></textarea>
</div>
</body>
</html>

<script type="text/javascript">
function get(){
	var table=document.getElementById("t");
	var row = document.getElementById("rowToSelect").value;
	row = parseInt(row);
	var col=document.getElementById("colToSelect").value;
	col= parseInt(col);
	
	if(isNaN(row)){
		alert("the input of the row must be a number");
		return false;
	}
	if(isNaN(col)){
		alert("the input of the column must be a number");
		return false;
	}
	
	if(row>table.rows.length ||col>table.rows.item(row-1).cells.length){
		alert("selected table cell is not exist");
		return false;
	}
	
	//alert( t.rows[row-1].cells[col-1].innerHTML);
	document.getElementById("textForSelect").innerHTML=t.rows[row-1].cells[col-1].innerHTML;
		
}

function change(){
	var table=document.getElementById("t");
	var row = document.getElementById("rowToChange").value;
	row = parseInt(row);
	var col=document.getElementById("colToChange").value;
	col= parseInt(col);
	
	if(isNaN(row)){
		alert("the input of the row must be a number");
		return false;
	}
	if(isNaN(col)){
		alert("the input of the column must be a number");
		return false;
	}
	
	if(row>table.rows.length ||col>table.rows.item(row-1).cells.length){
		alert("selected table cell is not exist");
		return false;
	}
	
	t.rows[row-1].cells[col-1].innerHTML = document.getElementById("value").value;
}

function trim(s) {
	return s.replace(/^\s*/, "").replace(/\s*$/, "");
}

function insert(){
	var table=document.getElementById("t");
	var row = document.getElementById("rowToInsert").value;
	row = parseInt(row);
	var firstName = document.getElementById("firstName").value;
	var lastName = document.getElementById("lastName").value;
	if(trim(firstName)==null||trim(firstName)==""){
		alert("first name can not be empty");
		return false;
	}
	if(trim(lastName)==null||trim(lastName)==""){
		alert("last name can not be empty");
		return false;
	}
	
	if(isNaN(row)){
		alert("the input of the row must be a number");
		return false;
	}
	if(row>table.rows.length){
		var r = confirm("the row number is bigger than the current table.\n"+"The value will be inserted into the end of the table");
		if(r==true){
			var r= table.insertRow(table.rows.length);
			r.insertCell(0).innerHTML = firstName;
			r.insertCell(1).innerHTML = lastName;
		}else{
			return false;
		}
	}
	var r= table.insertRow(row);
	r.insertCell(0).innerHTML = firstName;
	r.insertCell(1).innerHTML = lastName;
}

function deleteRow(){
	var table=document.getElementById("t");
	var row = document.getElementById("rowToDelete").value;
	row = parseInt(row);
	if(isNaN(row)){
		alert("the input of the row must be a number");
		return false;
	}
	if(row>=table.rows.length){
		var r = confirm("the row number is bigger than the current table.\n"+"The lat row will be deleted.");
		if(r==true){
			table.deleteRow(table.rows.length-1);
		}else{
			return false;
		}
	}
	
	var firstName = table.rows[row].cells[0].innerHTML;
	var lastName = table.rows[row].cells[1].innerHTML
	var r = confirm("Do you want to delete the name:'"+firstName+" "+lastName+"' in the table?" );
	if(r==true){
		table.deleteRow(row);
	}else{
		return false;
	}
}
</script>

List in HTML

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Sample List</title>
</head>
<body>
<div id="list">
Courses:
<ul id="courses">
	<li>Software Engineering</li>
	<li>Database</li>
</ul>
</div>
<div id="insert">
Insert course's name into the list: 
<input type="text" id="value" size="20"/>   
<input type="button" id="btnInsert" value="Insert" onclick="insert()"/>
</div>
<br/><br/>
<div id="insertBefore">
Insert course's name on the top of the list : 
<input type="text" id="value2" size="20"/>   
<input type="button" id="btnInsertBefore" value="Insert Before" onclick="insertOnTop()"/>
</div>
</body>
</html>

<script type="text/javascript">
function trim(s) {
	return s.replace(/^\s*/, "").replace(/\s*$/, "");
}
	function insert(){
		var ul= document.getElementById("courses");
		var li = document.createElement("li");
		var value = document.getElementById("value").value;
		
		if(trim(value)==null||trim(value)==""){
			alert("can not insert cours without name");
			return false;
		}
		li.innerHTML= value;
		ul.appendChild(li);
	}
	
	function insertOnTop(){
		var ul= document.getElementById("courses");
		var li = ul.firstChild.nextSibling.cloneNode(false);
		var value = document.getElementById("value2").value;
		if(trim(value)==null||trim(value)==""){
			alert("can not insert cours without name");
			return false;
		}
		li.innerHTML= value;
		ul.insertBefore(li,ul.firstChild);
	}
</script>