AJAX和PHP:如何停止脚本缓存? [英] AJAX and PHP: how to stop script being cached?
问题描述
问题:
如何添加令牌?我的show_aht.php已被缓存.我必须手动刷新show_aht.php才能在进入aht_button进行AJAX调用时在map.php中获取新数据.它非常令人沮丧.
How do I include a token? My show_aht.php is being cached. I have to refresh manually my show_aht.php in order to get new data in my map.php when I get on the aht_button to make the AJAX call. Its very frustrating.
单击aht_button时，它将返回数据，但是如果刷新页面和/或重新单击该按钮，它将仍然显示旧数据或什么都不做.我必须在浏览器中手动刷新"show_aht.php"，然后单击"aht_button"，这样我才能显示从"show_aht.php"中检索到的新数据.
When aht_button is clicked it returns data, but if I refresh the page and/or I reclick the button it will still show me the old data or do nothing at all. I have to manually refresh my "show_aht.php" on my browser and then click on "aht_button" so I can display the new data being retrieve from "show_aht.php".
我不想发布我的PHP代码，因为它有很多东西.也许有人可以找到问题，因为我不知道.不知道我们是否可以自己重新加载PHP脚本?我只放了重要的东西.
I did not want to post my PHP code because its a lot of stuff.. maybe someone can find the problem because I have no clue. Not sure if we can reload a PHP script by itself? I've put only the important stuff.
提前谢谢！
map.php JS:
map.php JS:
<div id="aht">
<button id="aht_button">AHT</button>
</div>
<script type="text/javascript">
$(document).ready(function() {
$('#aht').click(function(){
$.ajax({
type:"GET",
url : "show_aht.php", //use a token here??
data:{ } ,
dataType: 'json',
success : function(data){
//get the MIN value from the array
var min = data.reduce(function(prev, curr) {
return isNaN(+curr['aht_value']) || prev < +curr['aht_value'] ? prev : +curr['aht_value'];
}, 1000000);
alert("min:" + min);
//get the MAX value from the array
var max = data.reduce(function(prev, curr) {
return isNaN(+curr['aht_value']) || prev > +curr['aht_value'] ? prev : +curr['aht_value'];
}, -1000000);
alert("max:" + max);
//function for calculation of background color depending on aht_value
function conv(x){
return Math.floor((x - min) / (max - min) * 255);
}
//function for background color, if NA then show white background, either show from green to red
function colorMe(v){
return v == 'NA' ? "#FFF" : "rgb(" + conv(v) + "," + (255-conv(v)) + ",0)";
}
//going through all DIVs only once with this loop
for(var i = 0; i < data.length; i++) { // loop over results
var divForResult = $('#desk_' + data[i]['station']); // look for div for this object
if(divForResult.length) { // if a div was found
divForResult.html(data[i]['aht_value']).css("background-color", colorMe(data[i]['aht_value']));
}//end if
}//end for
}//end success
});//end ajax
});//end click
});//end rdy
</script>
show_aht.php:
show_aht.php:
include 'db_conn_retca2003.php';
include 'db_conn_retca2001.php';
header('Content-type: application/json');
/****************************************************
matching USER array and MEMO array
for matching username values
/****************************************************/
$result = array();
foreach ($memo as $username => $memodata) {
if (in_array($username, array_keys($user))) {
// Match username against the keys of $user (the usernames)
$userdata = $user[$username];
//if AHT is null give N/A as value
if (is_null($memodata['aht_value'])) {
$result[] = array( 'username' => $userdata['username'],
'aht_value' => 'NA',
'station' => $userdata['station']
);
}//end inner if
//else give the actual value of AHT without the decimals
else {
$result[] = array( 'username' => $userdata['username'],
'aht_value' => substr($memodata['aht_value'],0,-3),
'station' => $userdata['station']
);
}//end else
}//end outer if
}//end for
echo json_encode($result);
?>
推荐答案
可以通过多种方式停止浏览器缓存.一种是发送指示不进行缓存的标头.来自如何在所有页面上控制网页缓存浏览器?:
There's multiple ways you can stop browser caching. One is to send headers that indicate no caching. From How to control web page caching, across all browsers?:
适用于所有提到的标题的正确最小标题集 浏览器:
The correct minimum set of headers that works across all mentioned browsers:
Cache-Control: no-cache, no-store, must-revalidate Pragma: no-cache Expires: 0
使用PHP:
header('Cache-Control: no-cache, no-store, must-revalidate'); // HTTP 1.1.
header('Pragma: no-cache'); // HTTP 1.0. header('Expires: 0'); // Proxies.
使用HTML:
<meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
<meta http-equiv="Pragma" content="no-cache" />
<meta http-equiv="Expires" content="0" />
请注意，此方法取决于浏览器是否遵守no缓存标头.这不是保证.
Note that this method depends on browsers respecting the no cache headers. This is not a guarantee.
当链接到您不希望被缓存的文件时，您还可以添加一个包含当前时间戳的查询字符串变量.由于您每次都将使用不同的URL，因此浏览器将不会缓存.
You can also add a query string variable that contains the current time stamp when linking to those files you do not wish to be cached. Since you're going to a different URL every time, the browser will not cache.
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