Drupal Views 和公开的过滤器 - 如何重置可选的下拉列表过滤器，或允许“全部”过滤器选择
我有一个按国家/地区过滤的视图。国家/地区是可选的 CCK 文本字段，可从预定义列表中通过下拉列表进行选择。
当我将该字段公开为可选视图搜索过滤器时，我可以在过滤器表单上选择一个国家/地区，但如何处理不选择的情况？我希望用户能够“取消选择”任何先前选择的值，以便查询针对所有国家/地区运行（或者，更准确地说，不按国家/地区限制结果）。由于显而易见的原因，我无法将“all”作为值添加到 CCK 字段。在搜索过滤器的下拉列表中选择所有国家/地区不太人性化，并且会导致页面超时（列表中有超过 200 个国家/地区，我只能想象生成的 SQL 查询）。处理这个问题的最佳方法是什么？
我发现这个 View Filters Reset hack 可能会有所帮助。记住最后一个选择的愿望增加了另一个复杂性 - 当在视图属性中配置时，一旦设置（持久）cookie，就无法摆脱选择（除非手动删除 cookie）。
I have a view with a filter by country. Country is an optional CCK text field with drop-down list selection from a predefined list.
When I expose the field as an optional view search filter, I can select a country on the filter form just fine, but how can I handle no selection? I want the user to be able to "un-select" any previously selected value so that the query runs for all countries (or, to be more precise, does not constrain the results by country). I cannot add "all" as a value to the CCK field for obvious reasons. Selecting all countries in the drop-down on the search filter is not very user-friendly and causes the page to time out (there are over 200 countries in the list, and I can only imagine the resulting SQL query). Whats the best way to handle this?
I found this View Filters Reset hack which could be helpful. The desire to memorize the last selection adds another complication - when configured in the View properties, and once the (persistent) cookie is set, there is no way to get rid of the selection (short of manually deleting the cookie).
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答案是检查过滤器属性上的“强制单一”。这使得
The answer was to check "Force Single" on the filter properties. This made
<any>show up as a selection in the country filter drop-down. It kind of makes sense, because<any>in a multiple-selection list could be seen as ambiguous. Still, I can think of valid reasons why a multiple selection filter might be optional. Drupal surprises me every day.