jQuery文本框中的事件应用


文本框中的事件应用：以输入邮箱为例，如图：

代码如下：

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>jquery文本框中的事件应用</title>
    <style type="text/css">
    body{ font-size:13px;}
    /*元素初始化样式*/
    .divInit{ width:390px; height:55px; line-height:55px; padding-left:20px;}
    .txtInit{ border:solid 1px #666; padding:3px; background-image:url('Images/bg_email_input.gif');}
    .spnInit{ width:179px; height:40px; line-height:40px; float:right; margin-top:8px; padding-left:10px; background-repeat:no-repeat;}
    /*元素丢失焦点样式*/
    .divBlur{ background-color:#FEEEC2;}
    .txtBlur{ border:solid 1px #666; padding:3px; background-image:url('Images/bg_email_input2.gif');}
    .spnBlur{ background-image:url('Images/bg_email_wrong.gif');}
    .divFocu{ background-color:#EDFFD5;} /*div获取焦点样式*/
    .spnSucc{ background-image:url('Images/pic_Email_ok.gif'); margin-top:20px;} /*验证成功时span样式*/
    </style>
    <script src="Scripts/jquery-1.4.1-vsdoc.js" type="text/javascript"></script>
    <script src="Scripts/jquery-1.4.1.js" type="text/javascript"></script>
    <script type="text/javascript">
        $(function () {
            $("#txtEmail").trigger("focus"); //默认时文本框获得焦点
            $("#txtEmail").focus(function () { //文本框获取焦点事件
                $(this).removeClass("txtBlur").addClass("txtInit");
                $("#email").removeClass("divBlur").addClass("divFocu");
                $("#spnTip").removeClass("spnBlur").removeClass("spnSucc").html("请输入您常用邮箱地址！");
            });
            $("#txtEmail").blur(function () { //文本框丢失焦点事件
                var vTxt = $("#txtEmail").val();
                if (vTxt.length == 0) { //文本框中是否输入了邮箱
                    $(this).removeClass("txtInit").addClass("txtBlur");
                    $("# email").removeClass("divFocu").addClass("divBlur");
                    $("#spnTip").addClass("spnBlur").html("邮箱地址不能为空！");
                }
                else { //检测邮箱格式是否正确
                    if (!chkEmail(vTxt)) { //如果不正确
                        $(this).removeClass("txtInit").addClass("txtBlur");
                        $("#email").removeClass("divFocu").addClass("divBlur");
                        $("#spnTip").addClass("spnBlur").html("邮箱格式不正确！");
                    }
                    else { //如果正确
                        $(this).removeClass("txtBlur").addClass("txtInit");
                        $("#email").removeClass("divFocu");
                        $("#spnTip").removeClass("spnBlur").addClass("spnSucc").html("");
                    }
                }
            });
            /*验证邮箱格式是否正确 参数strEmail，需要验证的邮箱*/
            function chkEmail(strEmail) {
                var vChk = /^\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*$/;
                if (!vChk.test(strEmail)) {
                    return false;
                }
                else {
                    return true;
                }
            }
        });
    </script>
</head>
<body>
<form id="form1" action="#">
    <div id="email" class="divInit">邮箱:
        <span id="spnTip" class="spnInit"></span>
        <input type="text" id="txtEmail" class="txtInit" />
    </div>
</form>
</body>
</html>

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