本文實例講述了JavaScript監聽文本框回車事件并過濾文本框空格的方法。分享給大家供大家參考。具體如下：
<script type="text/javascript" language="javascript">var username = null;var password = null;//獲取文本框 onload = function(){ username = document.getElementById("txtUserName"); password = document.getElementById("txtPassWord"); }//清空文本框function clearTxt(){ username.value = ""; password.value = ""; username.focus(); // document.getElementById('txtUserName').value=""; // document.getElementById('txtPassWord').value=""; // document.getElementById('txtUserName').focus(); } //確定function chkTxt(){ //刪除前后空格 username.value = username.value.replace(/(^/s*)|(/s*$)/g,""); password.value = password.value.replace(/(^/s*)|(/s*$)/g,""); //判空 if(username.value.length == 0) { alert("請輸入用戶名!"); username.focus(); } else if(password.value.length == 0) { alert("請輸入密碼!"); password.focus(); } else document.getElementById("btnLogin").click();}//回車監聽function onkey(){ if (window.event.keyCode==13) {// document.all["btnLogin"].focus();// if(document.activeElement.id = "aReset")//判斷當前焦點所在的控件的id是aReset// {// document.getElementById("aReset").focus();// } document.getElementById("aLogin").focus(); return false; }}</script>css代碼：
<style type="text/css"> #btnLogin { width: 0px; height: 0px; border-style: none; background-color: White; } </style>html代碼：
<body onkeydown="onkey()">//把回車監聽加入body <form id="login_form" name="login_form" runat="server"> <div> <label>用戶：</label><input id="txtUserName" runat="server" name="u_name" class="input bold" type="text"/> <label>密碼：</label><input id="txtPassWord" runat="server" name="u_pass" class="input" type="password"/> <a href="javascript:chkTxt()" id="aLogin">確定</a> <%--<a href="javascript:document.forms['login_form'].reset()"> 重置</a>--%> <a href="javascript:clearTxt()" id="aReset">重置</a> <asp:Button ID="btnLogin" runat="server" Text="" OnClick="btnLogin_Click" /> </div> </form> </body>
希望本文所述對大家的javascript程序設計有所幫助。
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