JavaScript监听文本框回车事件并过滤文本框空格的方法
本文实例讲述了JavaScript监听文本框回车事件并过滤文本框空格的方法。分享给大家供大家参考。具体如下:
<scripttype="text/javascript"language="javascript">
varusername=null;
varpassword=null;
//获取文本框
onload=function()
{
username=document.getElementById("txtUserName");
password=document.getElementById("txtPassWord");
}
//清空文本框
functionclearTxt()
{
username.value="";
password.value="";
username.focus();
//document.getElementById('txtUserName').value="";
//document.getElementById('txtPassWord').value="";
//document.getElementById('txtUserName').focus();
}
//确定
functionchkTxt()
{
//删除前后空格
username.value=username.value.replace(/(^\s*)|(\s*$)/g,"");
password.value=password.value.replace(/(^\s*)|(\s*$)/g,"");
//判空
if(username.value.length==0)
{
alert("请输入用户名!");
username.focus();
}
elseif(password.value.length==0)
{
alert("请输入密码!");
password.focus();
}
else
document.getElementById("btnLogin").click();
}
//回车监听
functiononkey()
{
if(window.event.keyCode==13)
{
//document.all["btnLogin"].focus();
//if(document.activeElement.id="aReset")
//判断当前焦点所在的控件的id是aReset
//{
//document.getElementById("aReset").focus();
//}
document.getElementById("aLogin").focus();
returnfalse;
}
}
</script>
css代码:
<styletype="text/css">
#btnLogin
{
width:0px;
height:0px;
border-style:none;
background-color:White;
}
</style>
html代码:
<bodyonkeydown="onkey()">//把回车监听加入body <formid="login_form"name="login_form"runat="server"> <div> <label>用户:</label><inputid="txtUserName" runat="server"name="u_name"class="inputbold"type="text"/> <label>密码:</label><inputid="txtPassWord" runat="server"name="u_pass"class="input"type="password"/> <ahref="javascript:chkTxt()"id="aLogin">确定</a> <%--<ahref="javascript:document.forms['login_form'].reset()"> 重置</a>--%> <ahref="javascript:clearTxt()"id="aReset">重置</a> <asp:ButtonID="btnLogin"runat="server" Text=""OnClick="btnLogin_Click"/> </div> </form> </body>
希望本文所述对大家的javascript程序设计有所帮助。