将数据从php发送到javascript [英] send data from php to javascript

问题描述

我有一个关于从php到javascript的数据传输的问题。我从数据库收集一些数据，我将它们格式化为：

I have a question regarding data transmission from php to javascript. I gather some data from database and I format them like this:

for($i=0;$i<(sizeof($lt_periods_query['period_id']));$i++){

    $period_id   = $lt_periods_query['period_id'][$i];
    $lt_id       = $lt_periods_query['lt_id'][$i];
    $period_name = $lt_periods_query['period_name'][$i];
    $fDate       = $lt_periods_query['fromDate'][$i];
    $tDate       = $lt_periods_query['toDate'][$i];
    $minStay     = $lt_periods_query['min_stay'][$i];
    $nightly_rate= $lt_periods_query['nightly_rate'][$i];

    if (strStartsWith($fDate, $currentYear)=='true'){
        $year = $currentYear;
    } else if(strStartsWith($fDate, $nextYear)=='true'){
        $year = $nextYear;
    }

    $temp_period_details   =  array();
    $temp_period_details['period_id'] = $period_id;
    $temp_period_details['lt_id'] = $lt_id;
    $temp_period_details['period_name'] = $period_name;
    $temp_period_details['fromDate'] = $fDate;
    $temp_period_details['toDate'] = $tDate;
    $temp_period_details['min_stay'] = $minStay;
    $temp_period_details['nightly_rate'] = $nightly_rate;

    $periods[$year][$period_name] = $temp_period_details;
}

当我打印时，我能够看到它们：

And I am able to see them when I print as like this:

echo "RULE for 6 days <br>";
$days= '5';
$selPeriod = 'off_peak';
$selYear = '2011';
echo $periods[$selYear][$selPeriod]['period_id'];
echo "<br>";
echo $periods[$selYear][$selPeriod]['lt_id'];
echo "<br>";
echo $periods[$selYear][$selPeriod]['period_name'];

我知道php正在服务器端工作，javascript正在客户端工作。
我想通过发送一些这样的参数从javascript端获取数据（我知道为什么这不起作用但我不知道如何实现这样的数据传输）：

I know that php is working on the server side and javascript is working on the client side. I want to get the data from javascript side by sending some parameters like this (I know why this is not working but I do not know how I can achieve such data transfers):

    <script type="text/javascript">

    $(function(){

        getData();

        function getData(){

            var days= '5';
            var selPeriod = 'off_peak';
            var selYear = '2011';


            //var xxx     = '<?php echo $periods[\''+selYear+'\'][\''+selPeriod+'\'][\'fromDate\'] ;?>';
            //var xxx = '<?php include($periods['2011']['off_peak'][''])?>;

        }

    });

任何人都可以建议我通过发送一些参数从php收集数据到javascript。

Can anyone advice me a way to gather data from php to javascript by sending some parameters.

推荐答案

要将数据结构从PHP传递到Javascript，请注入这样的JSON值：

To communicate data structures from PHP to Javascript, inject a JSON value like this:

<?php
     $xdata = array(
          'foo'    => 'bar',
          'baz' => array('green','blue')
     );
?>
<script type="text/javascript">
    var xdata = <?php echo json_encode($xdata); ?>;

    alert(xdata['foo']);
    alert(xdata['baz'][0]);

    // Dot notation can be used if key/name is simple:
    alert(xdata.foo);
    alert(xdata.baz[0]);
</script>

这可以用来正确地逃避标量，数组，对象等。

This can be used to properly escape scalars, arrays, objects, etc.

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