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select menu, that 'tue' makes a textarea input box visible

Posted on 2010-08-31
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388 Views
Last Modified: 2012-05-10
if select 'tue'
show
textarea


can this text area be displayed when textarea is selected
before submit button is pressed
<form method=post action=pb-dropck.php>
<select name=t1>
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>

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Question by:rgb192
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8 Comments
 
LVL 82

Expert Comment

by:leakim971
ID: 33572419
Use : onchange="if(this.value.indexOf('Tue')==0) document.getElementById('textareaID').style.display='block'; else document.getElementById('textareaID').style.display='none';"

test page :


<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>
<form method=post action=pb-dropck.php>
<select name=t1 onchange="if(this.value.indexOf('Tue')==0) document.getElementById('textareaID').style.display='block'; else document.getElementById('textareaID').style.display='none';">
<option value=Mon $Mon>Mon</option>
<option value=Tue $Tue>Tue</option>
<option value=Wed $Wed>Wed</option>
<option value=Thu $Thu>Thu</option>
<option value=Fri $Fri>Fri</option>
<option value=Sat $Sat>Sat</option>
<option value=Sun $Sun>Sun</option>
</select>
<input type=submit value=Submit>
<textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>

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LVL 82

Expert Comment

by:leakim971
ID: 33572475
If you want to reuse :

      function chgDisplayTextarea(value, textarea, switchValue) {
            document.getElementById(textarea).style.display = (value.indexOf(switchValue)==0)?"block":"none";
      }

value : current value of the selectbox
textarea : id of the textarea to hide or show
switchValue : First characters to validate the displaying of the textarea or not

Example : chgDisplayTextarea(this.value, 'textareaID', 'Tue')

New test page :

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
<script language="javascript">
	function chgDisplayTextarea(value, textarea, switchValue) {
		document.getElementById(textarea).style.display = (value.indexOf(switchValue)==0)?"block":"none";
	}
</script>
</head>
<body>
<form method="post" action="pb-dropck.php">
    <select name=t1 onchange="chgDisplayTextarea(this.value, 'textareaID', 'Tue')">
        <option value=Mon $Mon>Mon</option>
        <option value=Tue $Tue>Tue</option>
        <option value=Wed $Wed>Wed</option>
        <option value=Thu $Thu>Thu</option>
        <option value=Fri $Fri>Fri</option>
        <option value=Sat $Sat>Sat</option>
        <option value=Sun $Sun>Sun</option>
    </select>
    <input type=submit value=Submit>
    <textarea id="textareaID" cols="20" rows="20" style="display:none"></textarea>
</form>
</body>
</html>

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LVL 82

Expert Comment

by:leakim971
ID: 33572498
to prevent problem with the case : Tue o tue or tuE or tUe
function chgDisplayTextarea(value, textarea, switchValue) {
		document.getElementById(textarea).style.display = (value.toLowerCase().indexOf(switchValue.toLowerCase())==0)?"block":"none";
	}

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Author Comment

by:rgb192
ID: 33576379
the post value for select box is $_POST['t1']

but what is it for the text area
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Accepted Solution

by:
leakim971 earned 500 total points
ID: 33576500
You need to set a name for it, for example ta1 (going to use $_POST["ta1"]), so we replace :

< textarea id="textareaID" cols="20" rows="20" style="display:none" >< /textarea >

By :


<textarea name="ta1" id="textareaID" cols="20" rows="20" style="display:none"></textarea>

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Author Closing Comment

by:rgb192
ID: 33581565
thanks
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Author Comment

by:rgb192
ID: 33581678
i have a similar question

I am trying to put this code in a php function
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/Q_26445679.html
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LVL 82

Expert Comment

by:leakim971
ID: 33582423
You're welcome! Thanks for the points!
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