[英]How to automate expiration of jQuery BBQ cache after some defined time?
我正在使用此代碼:
$(function () {
// For each .bbq widget, keep a data object containing a mapping of
// url-to-container for caching purposes.
$('.bbq').each(function () {
$(this).data('bbq', {
cache: {
// If url is '' (no fragment), display this div's content.
'': $(this).find('.bbq-default')
}
});
});
// For all links inside a .bbq widget, push the appropriate state onto the
// history when clicked.
$('.bbq a[href^=#]').live('click', function (e) {
var state = {},
// Get the id of this .bbq widget.
id = $(this).closest('.bbq').attr('id'),
// Get the url from the link's href attribute, stripping any leading #.
url = $(this).attr('href').replace(/^#/, '');
// Set the state!
state[id] = url;
$.bbq.pushState(state);
// And finally, prevent the default link click behavior by returning false.
return false;
});
// Bind an event to window.onhashchange that, when the history state changes,
// iterates over all .bbq widgets, getting their appropriate url from the
// current state. If that .bbq widget's url has changed, display either our
// cached content or fetch new content to be displayed.
$(window).bind('hashchange', function (e) {
// Iterate over all .bbq widgets.
$('.bbq').each(function () {
var that = $(this),
// Get the stored data for this .bbq widget.
data = that.data('bbq'),
// Get the url for this .bbq widget from the hash, based on the
// appropriate id property. In jQuery 1.4, you should use e.getState()
// instead of $.bbq.getState().
url = $.bbq.getState(that.attr('id')) || '';
// If the url hasn't changed, do nothing and skip to the next .bbq widget.
if (data.url === url) { return; }
// Store the url for the next time around.
data.url = url;
// Remove .bbq-current class from any previously "current" link(s).
that.find('a.bbq-current').removeClass('bbq-current');
// Hide any visible ajax content.
that.find('.bbq-content').children(':visible').hide();
// Add .bbq-current class to "current" nav link(s), only if url isn't empty.
url && that.find('a[href="#' + url + '"]').addClass('bbq-current');
if (data.cache[url]) {
// Since the widget is already in the cache, it doesn't need to be
// created, so instead of creating it again, let's just show it!
data.cache[url].show();
} else {
// Show "loading" content while AJAX content loads.
that.find('.bbq-loading').show();
// Create container for this url's content and store a reference to it in
// the cache.
data.cache[url] = $('<div class="bbq-item"/>')
// Append the content container to the parent container.
.appendTo(that.find('.bbq-content'))
// Load external content via AJAX. Note that in order to keep this
// example streamlined, only the content in .infobox is shown. You'll
// want to change this based on your needs.
.load(url, function () {
// Content loaded, hide "loading" content.
that.find('.bbq-loading').hide();
});
}
});
})
// Since the event is only triggered when the hash changes, we need to trigger
// the event now, to handle the hash the page may have loaded with.
$(window).trigger('hashchange');
});
從這里: http : //benalman.com/code/projects/jquery-bbq/examples/fragment-advanced/
它正在緩存動態加載的內容。 我想每10秒過期一次此緩存。 我在JQuery上不是很專業。 我該如何實現? 請幫忙!
UPDATE
我嘗試了這段代碼:
<script type="text/javascript" src="jquery.timer.js"></script>
<script type="text/javascript">
var timer = $.timer(function () {
$('.bbq').removeData('.bbq-content');
});
timer.set({ time: 5000, autostart: true });
</script>
代碼到達$('.bbq').removeData('.bbq-content');
每5秒刷新一次行,但不會清除緩存。 無法顯示更新結果。 請幫忙!
您不需要每隔10秒清除一次緩存的數據。 您只需要在顯示數據之前檢查緩存的數據是否早於10秒。
首先,我們需要一個地方來為每個緩存的數據保存時間戳。 將第一部分代碼替換為:
$('.bbq').each(function () {
$(this).data('bbq', {
cache: {
// If url is '' (no fragment), display this div's content.
'': $(this).find('.bbq-default')
},
cacheTimes: {} // <-- this line is new (plus the comma above)
});
});
然后,當發生hashchange
事件時,我們需要當前時間:
// Bind an event to window.onhashchange that, when the history state changes,
// iterates over all .bbq widgets, getting their appropriate url from the
// current state. If that .bbq widget's url has changed, display either our
// cached content or fetch new content to be displayed.
$(window).bind('hashchange', function (e) {
var now = (new Date()).getTime(); // <-- this line is new
// Iterate over all .bbq widgets.
$('.bbq').each(function () {
對於每個小部件,我們檢查是否已經經過了足夠的時間來使緩存無效:
// Get the url for this .bbq widget from the hash, based on the
// appropriate id property. In jQuery 1.4, you should use e.getState()
// instead of $.bbq.getState().
url = $.bbq.getState(that.attr('id')) || '';
// this chunk is new
if (url !== '' && now - (data.cacheTimes[url] || 0) > 10000) { // 10 seconds
data.url = null;
if (data.cache[url]) {
data.cache[url].remove();
data.cache[url] = null;
}
}
// If the url hasn't changed, do nothing and skip to the next .bbq widget.
if (data.url === url) { return; }
提取數據時,我們會記住當前時間:
// Show "loading" content while AJAX content loads.
that.find('.bbq-loading').show();
data.cacheTimes[url] = now; // <-- this line is new
// Create container for this url's content and store a reference to it in
// the cache.
data.cache[url] = $('<div class="bbq-item"/>')
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