asked on

Javascript to catch bad form before submit

What code would I need for a javascript function checkform();
That would make sure:
"name" and "color" are not empty ie: obj.value!=""

If one of them IS empty, then show the div named "warning" and NOT submit the form

However if, they are both populated, then SUBMIT the form

Thanks!

<form id="form1" name="form1" method="post" action="go.php">
 
  <label>Your Name<input type="text" name="name" id="name" /></label>
 
  Your Color:
  <label><input type="radio" name="color" id="color" value="red"  />Red</label>
  <label><input type="radio" name="color" id="color" value="green"  />Green</label>
  <label><input type="radio" name="color" id="color" value="blue"  />Blue</label>
 
  <div id="warning" style="display:none"> Please Complete The Form before submitting</div>
 
    <input type="submit" name="Submit" value="Submit" onclick="checkform(this); return false;" />
 
</form>

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ASKER CERTIFIED SOLUTION

hielo

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dban00b

ASKER

Not quite right, but pretty darn close, got me what I need, thanks!

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
 "http://www.w3.org/TR/html4/loose.dtd"> 
<html>
<head>
<title></title>
<script type="text/javascript">
function checkForm()
{
		var f=document.getElementById('form1');
        var e="";
        if( f.name.value=="" )
                e+="\nPlease enter your name";
        var c=false;
        for( var i=0; i < f.color.length; ++i)
                if( f.color[i].checked ) c=true;
        if(!c)
                e+="\nPlease Choose a color";
        if(e)
				document.getElementById('warning').style.display='';
		else
			 f.submit();
return e=="";
}
</script>
</head>
<body>
<form id="form1" name="form1" method="post" action="go.php">
 
  <label>Your Name<input type="text" name="name" id="name" /></label>
 
  Your Color:
  <label><input type="radio" name="color" id="color" value="red"  />Red</label>
  <label><input type="radio" name="color" id="color" value="green"  />Green</label>
  <label><input type="radio" name="color" id="color" value="blue"  />Blue</label>
 
  <div id="warning" name="warning" style="display:none;"> Please Complete The Form before submitting</div>
 
    <input type="button" name="Submit" value="Submit" onClick="checkForm(); return false;" />
 
</form> 
</body>
</html>

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hielo

you are welcome