問題描述
我目前正在使用 HTML5 拖放 API 開發一個項目,以提供附加功能,包括將項目拖入和拖出瀏覽器.我目前遇到了特定于 Chrome 的問題(否則僅在 Firefox 中測試,可以按預期工作).
I'm currently working on a project at work using the HTML5 Drag and Drop API to provide added functionality including dragging items in and out of browsers. I am currently coming across issues which are specific to Chrome (otherwise only tested in Firefox, which works as expected).
問題是我不能使用 event.dataTransfer.getData(type)
方法在 dragstart
事件之外的任何事件中返回數據集>drop 事件.
The issue is that I cannot use the event.dataTransfer.getData(type)
method to return the data set on the dragstart
event in any events except the drop
event.
在綁定到 dragstart
事件(確實會觸發)之后,我將事件設置為這樣:
I set the event like so, after binding to the dragstart
event (which DOES fire):
event.dataTransfer.setData('text/plain', "some string")
然后在 drop
事件中,我可以很好的獲取數據.
Then in the drop
event, I can get the data fine.
event.dataTransfer.getData('text/plain')
但是,我不能對任何其他事件(例如 dragover
)使用與上述相同的方法.即使我在調用 setData()
后(即在 dragstart
回調中)嘗試使用上面的方法,那么它仍然會返回 undefined代碼>.
However I cannot use the same method as above on any other events (such as dragover
). Even if I try and use the above method on the line after calling setData()
(i.e., in the dragstart
callback), then it will still return undefined
.
因此,在 Chrome 中,問題在于 Chrome 中的 getData
將始終返回 undefined
,除了在 drop
事件回調中.(在 Firefox 中,我可以成功獲取正確的數據.)
So, in Chrome, the issue is that getData
in Chrome will always return undefined
, except within the drop
event callback. (In Firefox, I can successfully get the correct data.)
如果你有對同一個拖動元素的dataTransfer
對象的引用,那為什么要等到數據被放掉才能得到數據呢?
If you have the reference to the dataTransfer
object of the same dragging element, then why should you not be able to get the data until it is dropped?
只是想知道:
- 以前有人在使用 Chrome 時遇到過這種問題嗎?
- 有哪些解決方法?
- 或者,這是 Chrome 需要修復的問題嗎?
資源:HTML5 拖放規范.
推薦答案
WebKit 和 Chrome 對何時可以調用 getData
有很大的限制.您不能在 dragstart
或 <代碼>dragover.我認為這是典型的錯誤.
WebKit, and hence Chrome, is quite restrictive on when you can call getData
. You're not allowed to do it inside dragstart
or dragover
. I think this is the canonical bug.
這篇關于HTML5 拖放 getData() 僅適用于 Chrome 中的拖放事件?的文章就介紹到這了,希望我們推薦的答案對大家有所幫助,也希望大家多多支持html5模板網!