你即將離開本站

並前往https://teamtreehouse.com/community/i-added-alert-box-if-input-is-empty-string-but-there-is-a-problem-help-please

i added alert box if input is empty string but there is a problem ...

preventDefault(); const text = input.value; input.value = ''; if(input.value === ''){ alert("can't leave blank,Please write a name"); } ...

確定！ 回上一頁

查詢 「Input text empty」的人也找了：

  1. Input value empty
    2.
  2. Jquery clear input value
    3.
  3. jQuery empty input value
    4.
  4. Javascript clear textbox
    5.
  5. Input type=text
    6.
  6. Javascript clear input box
    7.
  7. Input value null
    8.
  8. Javascript check textbox empty
    9.