JS form verification function not working_问答_开发者

JS form verification function not working

开发者 https://www.devze.com 2023-01-06 10:21 出处：网络

I have this form with a JS function to verify that there are no blank fields, but it doesn\'t work. <head>

I have this form with a JS function to verify that there are no blank fields, but it doesn't work.

<head>
  <script language='javascript'>
      function verifyForm(){
        var msg='';
        if(document.getElementById('field1').value==''){msg+='Field 1  \n';}
        if(document.getElementById('field2').value==''){msg+='Field 2  \n';}
        if(msg!=''){
            alert('The following entries are empty:\n\n'+msg);
            return false
        }else{
            return true }
        }
  </script>
</head>

<body>
   <form name="frmRequest2" id="frmRequest2" action="<? echo $submitURL2; ?>" method="post" onsubmit='return verifyForm();'>
   Please answer all questions and enter "NONE" where appropriate.

  <table>
    <tbody>
    开发者_StackOverflow社区  <tr>
        <th>List any items you already have</th>
        <th>List any items you need to get</th>
      </tr>
      <tr>
        <td><textarea name="field1" id="field1" rows="2" cols="39"> <? echo $field1; ?> </textarea></td>
        <td><textarea name="field2" id="field2" rows="2" cols="39"> <? echo $field2; ?> </textarea></td>
      </tr>

      <tr>
        <td colspan="4" align="center" valign="top" style="border-width: 0px 0px 0px 0px;"> <br />
        <input name="submit" value="Submit Data" type="submit"/> </td>
      </tr>      
    </tbody>
  </table>
  </form>
</body>

You have extra closing curly braces (}) after your if clauses.

Edited to add: The following code works as expected and ignores any leading/trailing whitespace in the fields:

<html>

<head>
  <script language='javascript'>
      function verifyForm(){
        var msg='';
        if(document.getElementById('field1').value.replace(/\s+$|^\s+/, '') == '') {msg+='Field 1  \n';}
        if(document.getElementById('field2').value.replace(/\s+$|^\s+/, '') == '') {msg+='Field 2  \n';}
        if(msg!=''){
            alert('The following entries are empty:\n\n'+msg);
            return false;
        }else{
            return true;
        }
      }
  </script>
</head>

<body>
   <form name="frmRequest2" id="frmRequest2" action="" method="post" onsubmit='return verifyForm();'>
   Please answer all questions and enter "NONE" where appropriate.

   <table>
      <tbody>
      <tr>
        <th>List any items you already have</th>
        <th>List any items you need to get</th>
      </tr>
      <tr>
        <td><textarea name="field1" id="field1" rows="2" cols="39"></textarea></td>
        <td><textarea name="field2" id="field2" rows="2" cols="39"></textarea></td>
      </tr>

      <tr>
        <td colspan="4" align="center" valign="top" style="border-width: 0px 0px 0px 0px;">
          <input name="submit" value="Submit Data" type="submit"/>
        </td>
      </tr>
    </tbody>
  </table>

 </form>
</body>

</html>

You're missing a ">" on your closing "[/head]" tag, you're not closing your "[form]" tag. That could cause a problem.

You have a space on each side of each of your default value. "" != " "

As a general rule, I like to trim the spaces of inputs. Does changing the if clause to

document.getElementById('field1').value == '' to
document.getElementById('field1').value.trim() == ''

Help at all?

Also, to reiterate what David suggested, your original code looks like

<textarea name="field1" id="field1" rows="2" cols="39"><? echo $field1; ?></textarea>

and not

<textarea name="field1" id="field1" rows="2" cols="39"> <? echo $field1; ?> </textarea>

Notice the spaces?

JS form verification function not working

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