代碼檢測textarea內填寫的長度，未填寫時提示需要重新填寫，少于15字符時提示需要長于15字符，成功時顯示所填寫建議。
<script type="text/javascript">//jQuery代碼function confirm(){ if($("#advice").val().length == 0){ alert("We can't see your advice. Maybe you should fill the form first."); $("#advice").focus(); return false;}else if($("#advice").val().length <= 15){ alert("Your advice should longer than 15 letters."); $("#advice").focus(); return false;}else{ alert("Thank you for your advice! You will get out reply in 24 hours for advice:/n"+$("#advice").val()); return true;}}</script><form action="" method="post" onSubmit="return confirm();" > <textarea id="advice" rows="20" cols="50"placeholder="Give us some advice?"></textarea> <input type="submit"value="Thank you"/></form>>關鍵點
1.必須要有onSubmit="return confirm();" return 這個詞，不可缺少。
2.自行完整的網頁結構。
以上所述就是本文的全部內容了，希望大家能夠喜歡。
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