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js 使用方法與函數(shù) 總結(jié)

更新時(shí)間：2009年05月17日 18:19:18 作者：

js使用方法小結(jié)，比較不錯(cuò)，無(wú)論是新手，還是老手都是不錯(cuò)的。

43 表單構(gòu)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>
44 訪(fǎng)問(wèn)表單中的文本框內(nèi)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>
45 動(dòng)態(tài)復(fù)制文本框內(nèi)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 =
6: document.myForm.myText.value;">Copy Text Field</a>
46 偵測(cè)文本框的變化
1: <form name="myForm">
2: Enter some Text: <input type="text" name="myText" onChange="alert(this.value);">
3: </form>
47 訪(fǎng)問(wèn)選中的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>
48 動(dòng)態(tài)增加Select項(xiàng)
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 驗(yàn)證表單字段
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>
50 驗(yàn)證Select項(xiàng)
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 動(dòng)態(tài)改變表單的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>
52 使用圖像按鈕
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>
6:
53 表單數(shù)據(jù)的加密
1: <SCRIPT LANGUAGE='JavaScript'>
2: 
17: </SCRIPT>
18: <form name='myForm' onSubmit='encryptForm(this); window.alert(this.myField.value);'>
19: Enter Some Text: <input type=text name=myField><input type=submit>
20: </form>