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JavaScript精简学习4：表单

摘要: JavaScript精简学习4：表单

<tr> <td>

43 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:

8: <input type=”submit” value=”Submit Me”>
9: </form>

44 访问表单中的文本框内容
1: <form name=”myForm”>
2: <input type=”text” name=”myText”>
3: </form>
4: Check Text Field

45 动态复制文本框内容
1: <form name=”myForm”>
2: Enter some Text: <input type=”text” name=”myText”>

3: Copy Text: <input type=”text” name=”copyText”>
4: </form>
5: 6: document.myForm.myText.value;”>Copy Text Field

46 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>

47 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: Check Selection List

48 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>

49 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:
<input type=”submit”>
12: </form>

50 验证Select项
1: function 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: }

51 动态改变表单的action
1: <form name=”myForm” action=”login.html”>
2: Username: <input type=”text” name=”username”>

3: Password: <input type=”password” name=”password”>

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>

52 使用图像按钮
1: <form name=”myForm” action=”login.html”>
2: Username: <input type=”text” name=”username”>

3: Password: <input type=”password”name=”password”>

4: <input type=”image” src=”login.gif” value=”Login”>
5: </form>
6:

53 表单数据的加密
1: <script LANGUAGE='JavaScript'>
2:

上面的encryptForm方法把表单中的数据转换为编码，在提交表单之前完成了简单的表单数据加密～

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