大家好,我目前正在努力找出如何在用户选择";日期";例如从下拉菜单。
我的下拉菜单目前由旅行的出发日期填充,我希望与该日期相关的所有其他信息都显示在页面上的文本框中。
这是我正在进行的一个项目,不幸的是,我们目前的服务器不支持pdo。
这让我头晕目眩,我无法思考我应该如何做到这一点。在互联网上搜索并没有给我任何有用的信息。
这是我的选择框和文本框的html代码。
<div>
<label><strong>Search Tours</strong></label>
<form>
<p>
<select name="lst_tour">
<option value="">Select a Tour:</option>
<?php
foreach ( $results as $option ) : ?>
<option value="<?php
echo $option->departure_date; ?>"><?php echo $option->departure_date; ?> </option>
<?php endforeach; ?>
</select>
</p>
<p><strong>List of Tour Details</strong></p>
<input name="txt_tourname" type="text" id="txt_tourname" readonly="readonly" value = <?php echo $ltour_name ?> />
</label></td>
<input name="txt_departuredate" type="text" id="txt_departuredate" readonly="readonly" />
</label>
<input name="txt_tourdetails" type="text" id="txt_tourdetails" readonly="readonly" />
</label>
这是我的php连接代码
<?php
session_start();
$server = "server";
$schema = "schema";
$uid = "name";
$pwd = "pass";
$tour_name =$_POST["txt_tourname"];
$departure_date =$_POST["txt_departuredate"];
$tour_details =$_POST["txt_tourdetails"];
$no_of_volunteers =$_POST["txt_noofvolunteers"];
mysql_connect($server , $uid , $pwd) or die ("server not found");
mysql_select_db($schema) or die ("Database not found");
$sql = "SELECT * FROM tour";
$query = mysql_query($sql);
while ( $results[] = mysql_fetch_object ( $query ) );
array_pop ( $results );
?>
任何帮助都会很棒。
好的,这个问题被问了很多,回答了很多,大多数提问者都有概念问题。我将分部分对此进行解释,之后我将对您的代码进行干净的重写,包括一个javascript文件,供您深入学习
- 您试图做的事情背后的想法涉及到最有可能是静态html页面的部分的某种行为
- Javascript将行为添加到原本已经失效的html中,允许您触发事件并生成响应
- Ajax诞生于一种集体需求,即在用户不离开页面的情况下能够与服务器对话。它允许我们在后台发出请求(异步)并带回信息
- 将行为与异步请求相结合的能力是当今丰富的互联网应用程序(简称RIA?)的基础
好吧,不要从表面上看,做一些研究,你会发现它的潜力。同时,我会创建一个你想要的模型,我会尽快回来。注意其他答案,周围有很多知识渊博的人
编辑
html表单
<form method="somemethod" action="somescript.php">
<select name="lst_tour" id="lst_tour">
<option value="">Select a Tour:</option>
<?php foreach ( $results as $option ) {
?><option value="<?php echo $option->departure_date; ?>"><?php echo $option->departure_date; ?></option><?php
} ?></select>
<!-- these will be "magically" populated, they conveniently have ids ^^ -->
<input name="txt_tourname" type="text" id="txt_tourname" readonly="readonly" />
<input name="txt_departuredate" type="text" id="txt_departuredate" readonly="readonly" />
<input name="txt_tourdetails" type="text" id="txt_tourdetails" readonly="readonly" />
</form>
javascript
大量的编辑和重写。这是一个有很多alerts
的嘈杂脚本,所以请耐心等待,并在您不再需要警报时按顺序开始删除警报注意:select标记有一个id,我用它来查找它并附加事件处理程序
(function(){
var
// the php script that's taking care of business
url = 'http://path/to/handling/ajaxscript.php',
select,
// assume these are the ids of the fields to populate
// AND assume they are the keys of the array thats comming from the server
inputs = ['txt_tourname','txt_departuredate','txt_tourdetails'],
// the XMLHttpRequest, I'm not recycling it but, oh well
xhr,
// the onReadyStateChange handler function, it needs access to xhr
xhrRSC,
// event handler, called for <select>."onChange"
onChooseDate,
// response handler that will be executed once the xhrRSC deems it ready
populateData,
// convenient event handlers
onLoad, onUnload;
xhrRSC = function () {
if (xhr && xhr.readyState !== 4) {return;}
alert('the server response has completed. Now continue with the population');
populateData(JSON.parse(xhr.responseText));
xhr = null;
};
onChooseDate = function () {
var date = select.options[select.selectedIndex].value;
alert('I have been changed. Did I select the right date: '+date
+'. Now we send some info to the server');
// AJAX: make xhr
xhr = new XMLHttpRequest();
// AJAX: setup handler
xhr.onreadystatechange = xhrRSC;
// AJAX: open channel
xhr.open('get',url+'?ajax=1&date='+date,true);
// AJAX: send data (if method post)
xhr.send(null);
// if we had jQuery, we could condense all this into one line
// $.post(url,{ajax:1,date:date},populateData,'json');
};
populateData = function (json) {
// we have the content from the server. Now json decode it
alert('json data => '+json.toSource());
// foreach input id execute function
inputs.forEach(function(v){
// set the value of each input to the data sent by the server
alert('setting input "'+v+'" to "'+json[v]+'"');
document.getElementById(v).value = json[v];
});
};
onLoad = function () {
alert('page has loaded');
// assume the <select> tag has an id of "lst_tour", just as it's name
select = document.getElementById('lst_tour');
// the "change" event is fired when the user changes the selected <option>
select.addEventListener('change',onChooseDate,false);
};
onUnload = function () {
select.removeEventListener('change',onChooseDate,false);
select = null;
};
window.addEventListener('load',onLoad,false);
window.addEventListener('unload',onUnload,false);
}());
ajax脚本,php处理程序
<?php
// this file has $_GET populated with 'ajax' => '1' and 'date' => 'what the user chose'
if (!isset($_GET['ajax'])) die('this is not how its supposed to work');
// we must protect the output
ob_start();
// your initializers
// your logic: it should make the selection, then populate the array to be JSON encoded
$response = array(
'txt_tourname' => $txt_tourname,
'txt_departuredate' => $txt_departuredate,
'txt_tourdetails' => $txt_tourdetails
);
// you may want to log this for debugging
// server output has been protected
ob_end_clean();
header('Content-Type: text/json');
echo json_encode($response);
// the client has what he wanted
exit;
它是这样的,它没有经过测试,而且是一个手工的,但经过仔细的审查,你会学到很多。另请阅读Crockford,并考虑到使用jQuery的好处,即使用jQuery