case 1: leave the empty field in new record
case 2: retrieve a value from the DB
case 3: leave field unchanged
case 4: leave field with changed value
case 5: commit without leaving field
post-change fires in cases 2, 4 and 5
when-validate fires in cases 1, 4, 5
post-text-item fires in cases 1, 3, 4, 5(不是很容易掌握)
pre-text-item有點類似got-focus
post-change: 欄位值改變則觸發
注意：如果是因為其他欄位的trigger讓欄位值改變，則不會觸發，除非離開當前的資料錄
pre-text-item在焦點進入就觸發
欄位值改變會先觸發post-change，接著才觸發when-validate-item
LOV欄位在給值後才會觸發when-validate-item
case 2: retrieve a value from the DB
case 3: leave field unchanged
case 4: leave field with changed value
case 5: commit without leaving field
post-change fires in cases 2, 4 and 5
when-validate fires in cases 1, 4, 5
post-text-item fires in cases 1, 3, 4, 5(不是很容易掌握)
pre-text-item有點類似got-focus
post-change: 欄位值改變則觸發
注意：如果是因為其他欄位的trigger讓欄位值改變，則不會觸發，除非離開當前的資料錄
pre-text-item在焦點進入就觸發
欄位值改變會先觸發post-change，接著才觸發when-validate-item
LOV欄位在給值後才會觸發when-validate-item
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