我在通过GET url传递日期参数时遇到问题。我从两个带有日期选择器的输入字段中提取数据。这是代码:
$(".options input[type='submit']").click(function() {
$('#From').datepicker();
$('#To').datepicker();
var $From = $('#From').datepicker('getDate').getDate();
var $To = $('#To').datepicker('getDate').getDate();
$('#placeholder').html('<img src="php/jpgraph/example2.php?From=' + $From + '&To=' + $To + '" />');
});
Html页面:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" href="layout.css" type="text/css"/>
<link rel="stylesheet" href="jquery-ui-1.8.17.custom.css" type="text/css" />
<script type="text/javascript" src="jquery.js"></script>
<script type="text/javascript" src="jquery-ui.js"></script>
<script type="text/javascript" src="newjavascript.js"></script>
</head>
<body>
<div id="container">
<div id="sidemenu">
<div class="options">
Датум од:<input type="text" id="From" name="From" size="10"/><br />
Датум до:<input type="text" id="To" name="To" size="10"/>
</div>
<br />
<div class="options">
<input type="submit" value="Show">
</div>
</div>
<div id="content">
<div id="placeholder" style="width:600px;height:300px;"></div>
</div>
</div><!-- divContainer -->
</body>
</html>
当我从日期选择器中选择日期时,图像显示。但如果我不使用日期选择器选择日期,那么什么都不会显示。也许我可以检查是否未选择日期,然后将值设置为空字符串。类似这样的东西:
if ($From == null) {
$From = '';
}
if ($To == null) {
$To = '';
}
我试过了,但没用。这个问题的解决方案是什么?
编辑:目前,为了简化问题,我不在服务器端处理GET参数,但请看一下:
<?php
require_once ('jpgraph.php');
require_once ('jpgraph_line.php');
$con = mysql_connect("localhost", "user", "pass");
if (!$con) {
die('Could not connect:' . mysql_error());
}
mysql_select_db("db", $con);
$result = mysql_query("select Temperature from TEMPERATURE");
$niz = array();
while ($row = mysql_fetch_array($result)) {
$niz[] = $row['Temperature'];
}
$graph = new Graph(600,400);
$graph->SetScale('intint');
$graph->title->set('Title');
$graph->xaxis->title->Set('Day');
$graph->yaxis->title->Set('Temp');
$lineplot=new LinePlot($niz);
$lineplot->SetColor('blue');
$graph->Add($lineplot);
$graph->Stroke();
?>
试试这个。
if($('#From').val()){
//Get the date here
var fromDate = $('#From').datepicker('getDate');
}
if($('#To').val()){
//Get the date here
var toDate = $('#To').datepicker('getDate');
}