JavaScript方法和技巧大全——表单

表单构成
1<form method=”post” action=”target.html” name=”thisForm”>
2 <input type=”text” name=”myText”>
3 <select name=”mySelect”>
4 <option value=”1”>First Choice</option>
5 <option value=”2”>Second Choice</option>
6 </select>
7 <br>
8 <input type=”submit” value=”Submit Me”>
9</form>

访问表单中的文本框内容
1<form name=”myForm”>
2 <input type=”text” name=”myText”>
3 </form>
4<a href='#' onClick='window.alert(document.myForm.myText.value);'>Check Text Field</a>

动态复制文本框内容
1<form name=”myForm”>
2 Enter some Text: <input type=”text” name=”myText”><br>
3 Copy Text: <input type=”text” name=”copyText”>
4</form>
5 <a href=”#” onClick=”document.myForm.copyText.value =  document.myForm.myText.value;”>Copy Text Field</a>

侦测文本框的变化
1<form name=”myForm”>
2 Enter some Text: <input type=”text” name=”myText” onChange=”alert(this.value);”>
3</form>

访问选中的Select
1<form name=”myForm”>
2 <select name=”mySelect”>
3 <option value=”First Choice”>1</option>
4 <option value=”Second Choice”>2</option>
5 <option value=”Third Choice”>3</option>
6 </select>
7</form>
8<a href='#' onClick='alert(document.myForm.mySelect.value);'>Check Selection List</a>

动态增加Select项
1<form name=”myForm”>
2 <select name=”mySelect”>
3 <option value=”First Choice”>1</option>
4 <option value=”Second Choice”>2</option>
5 </select>
6</form>
7<script language=”JavaScript”>
8 document.myForm.mySelect.length++;
9 document.myForm.mySelect.options[document.myForm.mySelect.length - 1].text = “3”;
10 document.myForm.mySelect.options[document.myForm.mySelect.length - 1].value = “Third Choice”;
11</script>

验证表单字段
1<script language=”JavaScript”>
2 function checkField(field) {
3 if (field.value == “”) {
4 window.alert(“You must enter a value in the field”);
5 field.focus();
6 }
7 }
8</script>
9<form name=”myForm” action=”target.html”>
10 Text Field: <input type=”text” name=”myField”onBlur=”checkField(this)”>
11 <br><input type=”submit”>
12</form>

验证Select项
1function checkList(selection) {
2 if (selection.length == 0) {
3 window.alert(“You must make a selection from the list.”);
4 return false;
5 }
6 return true;
7}

动态改变表单的action
1<form name=”myForm” action=”login.html”>
2 Username: <input type=”text” name=”username”><br>
3 Password: <input type=”password” name=”password”><br>
4 <input type=”button” value=”Login” onClick=”this.form.submit();”>
5 <input type=”button” value=”Register” onClick=”this.form.action = ‘register.html’; this.form.submit();”>
6 <input type=”button” value=”Retrieve Password” onClick=”this.form.action = ‘password.html’; this.form.submit();”>
7</form>

使用图像按钮
1<form name=”myForm” action=”login.html”>
2 Username: <input type=”text” name=”username”><br>
3 Password: <input type=”password”name=”password”><br>
4 <input type=”image” src="/”login.gif"” value=”Login”>
5</form>

表单数据的加密
1<SCRIPT LANGUAGE='JavaScript'>
2 function encrypt(item) {
3   var newItem = '';
4     for (i=0; i < item.length; i++) {
5       newItem += item.charCodeAt(i) + '.';
6     }
7   return newItem;
8 }
9 function encryptForm(myForm) {
10   for (i=0; i < myForm.elements.length; i++)  {
11          myForm.elements[i].value = encrypt(myForm.elements[i].value);
12   }
13}
14</SCRIPT>
15<form name='myForm' onSubmit='encryptForm(this); window.alert(this.myField.value);'>
16 Enter Some Text: <input type=text name=myField><input type=submit>
17</form>

posted on 2009-02-03 10:24 飞翔天使阅读(290) 评论(1) 编辑收藏所属分类: javascript

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