<form>
名字:<input type="text" name="name" id="name" >
<input type="button" name="btn" id="btn" value="查詢">
</form>
<script>
$(function(){
$("#btn").click(function(){
$.ajax({
"dataType": 'json',
"type": "POST",
"url": "ajax.php",
"data": {'name':$("#name").val()},//獲取表單中id是name的值
"success": function(obj){//提交成功
alert(obj.msg);
},
"error":function(){//提交失敗
alert('error');
}
});
})
})
</script>
ajax.php頁面
<?php
$name = $_POST['name'];
//做數據庫查詢
//查詢到數據存在，成功
if($success){
exit(json_encode(array('errno'=>0,'msg'=>'success')));
}else{
//查詢不到數據，失敗
exit(json_encode(array('errno'=>1,'msg'=>'error')));
}