我有一个简单的 html 表单,可以通过输入 ID 自动填充字段。它工作正常。但是,如果在数据库中没有找到 ID,它只能返回 null 到表单字段。我试图显示一条错误消息(可以是一个弹出窗口),说找不到 ID!但我没能做到。这是我将信息回显到表单字段的代码:
if (strlen($param) > 0) {
$result = mysql_query("SELECT * FROM contact
WHERE contactid LIKE '$param%'");
if (mysql_num_rows($result) == 1) {
while ($myrow = mysql_fetch_array($result)) {
$agentname = $myrow["contactfullname"];
$agenttel = $myrow["contacttel"];
$agentsal = $myrow["contactsalutation"];
$agentid = $myrow["contactid"];
$textout .= $agentid . ", " . $agentname . ", " . $agenttel . ", " . $agentsal;
}
} else {
$textout = " , , ," . $param;
}
}
echo $textout;
这是我的ajaxFunction:
function ajaxFunction(e){
var e=e || window.event;
var keycode=e.which || e.keyCode;
if(keycode==13 || (e.target||e.srcElement).value==''){
var http; // The variable that makes Ajax possible!
try{
// Opera 8.0+, Firefox, Safari
http = new XMLHttpRequest();
} catch (e){
// Internet Explorer Browsers
try{
http = new ActiveXObject("Msxml2.XMLHTTP");
} catch (e) {
try{
http = new ActiveXObject("Microsoft.XMLHTTP");
} catch (e){
// Something went wrong
alert("Your browser broke!");
return false;
}
}
}
var url = "getagentids.php?param=";
var idValue = document.getElementById("agid").value;
var myRandom = parseInt(Math.random()*99999999); // cache buster
http.open("GET", "getagentids.php?param=" + escape(idValue) + "&rand=" + myRandom, true);
http.onreadystatechange = handleHttpResponse;
http.send(null);
function handleHttpResponse() {
if (http.readyState == 4) {
results = http.responseText.split(",");
document.getElementById('agfn').value = results[0];
document.getElementById('agsal').value = results[1];
document.getElementById('agtel').value = results[2];
document.getElementById('agid').value = results[3];
}
}
}
}