使用DataTable的buttons功能會將原本的設定每頁顯示筆數下拉式選單移除問題。
原本是這樣：
加入buttons之後變這樣，原本的下拉式選單就這樣消失了。
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上官網討論區找到解法：
在button宣告前要加上"dom":"Bfrtip"參數，改成"Blfrtip"(多加一個小寫"L"，代表length changing input control)即可。
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參考自 https://datatables.net/forums/discussion/29866/datatables-buttons-removes-the-length-menu
Here is what I used to add the buttons to the datatable for the export etc:
http://datatables.net/reference/button/#tabletools
Note the dom: 'Bfrtip', property does not have the letter 'L' in it.
Referring to this you will note that adding 'L' to the dom property adds the length selector:
http://datatables.net/reference/option/dom
So the final dom should look like this:
dom: 'Blfrtip',
(note the additional 'L' after the 'B' character)
This will give you the export buttons and you can also select the row count to show.
Hope this helps
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