AJAX showHint()函数
发布时间:2020-12-16 00:39:38 所属栏目:百科 来源:网络整理
导读:data.php ?php header("Content-type: text/html; charset=utf-8"); $val = $_GET['q'];$regular = '/^[A-Z]/';if (!preg_match($regular,$val)) {echo '用户名不合法';} ? htmlheadscript type="text/javascript"function showHint(str){var xmlhttp;if (st
data.php <?php header("Content-type: text/html; charset=utf-8"); $val = $_GET['q']; $regular = '/^[A-Z]/'; if (!preg_match($regular,$val)) { echo '用户名不合法'; } ?> <html> <head> <script type="text/javascript"> function showHint(str) { var xmlhttp; if (str.length==0) { document.getElementById("txtHint").innerHTML=""; return; } if (window.XMLHttpRequest) {// code for IE7+,Firefox,Chrome,Opera,Safari xmlhttp=new XMLHttpRequest(); } else {// code for IE6,IE5 xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { document.getElementById("txtHint").innerHTML=xmlhttp.responseText; } } xmlhttp.open("GET","data.php?q="+str,true); xmlhttp.send(); } </script> </head> <body> <h3>请在下面的输入框中键入字母(A - Z):</h3> <form action=""> <p>姓氏:<input type="text" id="txt1" onkeyup="showHint(this.value)" /><span id="txtHint"></span></p> <input type="reset"> </form> </body> </html> 效果图:
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