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javascript - 空输入字段的JavaScript验证(JavaScript validation for empty input field)

Greeting, I have this input field <input name="question"/> I want to call IsEmpty function when submit clicking submit button.

(问候,我有这个输入字段<input name="question"/>我想在单击提交按钮时调用IsEmpty函数。)

I tried the code below but did not work.

(我尝试了下面的代码,但是没有用。)

any advice?!

(有什么建议吗?)

 <html> <head> <title></title> <meta http-equiv="Content-Type" content="text/html; charset=unicode" /> <meta content="CoffeeCup HTML Editor (www.coffeecup.com)" name="generator" /> </head> <body> <script language="Javascript"> function IsEmpty() { if (document.form.question.value == "") { alert("empty"); } return; } </script> Question: <input name="question" /> <br/> <input id="insert" onclick="IsEmpty();" type="submit" value="Add Question" /> </body> </html> 

  ask by Eyla translate from so


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 <script type="text/javascript"> function validateForm() { var a = document.forms["Form"]["answer_a"].value; var b = document.forms["Form"]["answer_b"].value; var c = document.forms["Form"]["answer_c"].value; var d = document.forms["Form"]["answer_d"].value; if (a == null || a == "", b == null || b == "", c == null || c == "", d == null || d == "") { alert("Please Fill All Required Field"); return false; } } </script> <form method="post" name="Form" onsubmit="return validateForm()" action=""> <textarea cols="30" rows="2" name="answer_a" id="a"></textarea> <textarea cols="30" rows="2" name="answer_b" id="b"></textarea> <textarea cols="30" rows="2" name="answer_c" id="c"></textarea> <textarea cols="30" rows="2" name="answer_d" id="d"></textarea> </form> 


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