ASP:列表框|多选|选择新值时保留所选值
1) 有一个列表框,其中选择了 5 个值中的 3 个值
2) 当我单击选择另一个值而不按住 CTRL 按钮时,它将取消选择值
如果选择了新值,如何使其保留其他选定值?
1) Have a listbox with 3 values out of 5 selected
2) When I click to select another value without holding CTRL button, it will unselect over values
How to make it keep other selected values if new value is selected?
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这听起来像是一个讽刺的答案,但我并不是那个意思。我只是喜欢寻找简单的解决方案而不是复杂的解决方案。
使控件具有所需行为的最简单方法是使用具有所需行为的控件,而不是修改现有控件的行为。
也就是说,如果您想要一个项目列表,其中用户可以从列表中选择一堆项目,并且不想依赖它们来控制,那么您使用了错误的工具来完成这项工作。
使用 CheckBoxList 而不是 ListBox。如果希望它可以滚动,那么将其设置在特定高度的div中,并将div的样式设置为“overflow:scroll”。
This is going to sound like a snide answer, but I don't mean it that way. I just like to look for the simple solutions rather than the complicated onces.
The easiest way to get a control to have the behavior you want is to use a control that has the behavior that you want, rather than modifying the behavior of an existing control.
That said, if you want a list of items where a user can select a bunch of items off the list, and don't want to have to rely on them holding control, you're using the wrong tool for the job.
Use a CheckBoxList instead of a ListBox. If you want it to be scrollable, then set it in a div of a specific height, and set the style of the div to "overflow: scroll".
如果您仍然想使用 ListBox,则应该使用 javascript,并且对于触发的每个单击事件,您应该检查单击的元素是否被选择/取消选择并采取相应的操作。这有点棘手,但至少它是您问题的解决方案。
If you still want to use a ListBox you should use javascript and for each click event fired, you should check if the clicked element is selected/unselected and act accordingly. It's a little bit tricky but at least it is a solution for your problem.