我正在为我的网站使用 PHP、MySQL、Smarty、jQuery、AJAX 等。现在我正在尝试创建一个输入字段（具有 id user_name) 启用自动完成。我想在用户开始输入输入字段时给他一些建议。我将用户输入的值作为参数传递，根据收到的参数从 MySQL 数据库中获取建议，将获取的数据库记录转换为 json 响应并尝试将其作为建议显示给用户。但不幸的是，当用户输入时，我无法以 json 格式向用户显示我收到的建议。如果我在 firbug 中观察到，请求正常进行，json 响应也正常接收，但未显示在文本字段下方作为建议。在 firebug 控制台中也没有发现错误。供您参考，我将代码放在下面。HTML（来自 smarty 的代码）部分：
<html>
<head>
<link rel="stylesheet" type="text/css" href="{$control_css_url}ui-lightness/jquery-ui-1.10.3.custom.css">
<link rel="stylesheet" type="text/css" href="{$control_css_url}autocomplete.css">
<script src="{$control_js_url}vendor/jquery-1.9.1.min.js"></script>
<script type="text/javascript" src="{$control_js_url}jquery-ui/jquery-ui-1.10.3.custom.min.js"></script>
</head>
<body>
<form id="view-student_result-form" name="view_student_result" action="{$control_url}modules/reports/report_student_result.php" method="post">
<input type="hidden" name="op" id="op" value="get_student_result" >
<div class="w50">
<ul>
<li>
<label>Class</label>
<div class="form-element">
<select name="class_id" id="class_id" onchange="get_section_by_class(this.value, 'get_section_by_class', '#section_id'); return false;">
<option value="">-Select Class-</option>
{foreach from=$all_class item=class key=key}
<option value="{$class.group_id}" {if $class_id == $class.group_id} selected="selected"{/if}>{$class.group_name}</option>
{/foreach}
</select>
</div>
</li>
<li>
<label>Name</label>
<div class="form-element" id="friends" class="ui-helper-clearfix">
<input type="text" class="" name="user_name" id="user_name" value="{$user_name}" />
</div>
</li>
<li>
<label>Section</label>
<div class="form-element">
<select name="section_id" id="section_id">
{if empty($section_id)}
<option value="">-Select Section-</option>
{else}
<option value="all">All</option>
{/if}
{foreach from=$all_section_by_class item=section key=key}
<option value="{$section.group_id}" {if $section_id==$section.group_id} selected="selected"{/if}>{$section.group_name}</option>
{/foreach}
</select>
</div>
</li>
</ul>
</div>
</form>
</body>
</html>
{literal}
<script language="javascript" type="text/javascript">
$(function() {
//attach autocomplete
$("#user_name").autocomplete({
//define callback to format results
source: function(req, add) {
var class_id = $('#class_id').val();
var section_id = $('#section_id').val();
//pass request to server
$.getJSON("report_student_result.php?callback=?&op=get_student_names&class_id="+class_id+"§ion_id="+section_id, req, function(data) {
//create array for response objects
var suggestions = [[]];
//process response
$.each(data, function(i, val){
suggestions.push(val.name);
});
//pass array to callback
add([suggestions]);
});
},
//define select handler
select: function(e, ui) {
//create formatted friend
var friend = ui.item.value,
span = $("<span>").text(friend),
a = $("<a>").addClass("remove").attr({
href: "javascript:",
title: "Remove " + friend
}).text("x").appendTo(span);
//add friend to friend div
span.insertBefore("#user_name");
},
//define select handler
change: function() {
//prevent 'user_name' field being updated and correct position
$("#user_name").val("").css("top", 2);
}
});
//add click handler to friends div
$("#friends").click(function(){
//focus 'user_name' field
$("#user_name").focus();
});
//add live handler for clicks on remove links
$('#friends').on("click", ".remove", document.getElementById("friends"), function(){
//$(".remove", document.getElementById("friends")).live("click", function(){
//remove current friend
$(this).parent().remove();
//correct 'user_name' field position
if($("#friends span").length === 0) {
$("#user_name").css("top", 0);
}
});
});
</script>
{/literal}
现在来自 PHP 文件的代码（来自文件 report_student_result.php 的一种情况）：
<?php
global $gDb;
$op = $request['op'];
switch($op) {
case'get_student_names':
$param = $_GET["term"];
$group_id = $request['class_id'];
if($request['section_id'] !='all')
$group_id = $request['section_id'];
if ($group_id != '') {
$sql =" SELECT u.user_id, CONCAT(u.user_first_name, ' ', u.user_last_name) as full_name ";
$sql .=" FROM ".TBL_USERS." as u JOIN ".TBL_USERS_GROUPS_SUBSCRIBE." as ugs ON u.user_id = ";
$sql .=" ugs.subscribe_user_id WHERE ugs.subscribe_group_id = ".$group_id." AND (u.user_first_name ";
$sql .=" REGEXP '^$param' OR u.user_last_name REGEXP '^$param')";
} else {
$sql =" SELECT user_id, CONCAT(user_first_name, ' ', user_last_name) as full_name ";
$sql .=" FROM ".TBL_USERS." WHERE user_first_name REGEXP '^$param' OR user_last_name ";
$sql .=" REGEXP '^$param'";
}
$gDb->Query( $sql );
$data = $gDb->FetchArray();
$response = $_GET["callback"] . "(" . json_encode($data) . ")";
echo $response;
die;
}
?>
如果您想要更多信息，例如我在用户输入文本时收到的 json 响应，我可以为您提供。上面的代码工作正常，唯一的问题是显示在具有 id user_name的文本字段下收到的建议。请帮我解决这个问题。期待您的回复。提前致谢。