Solved

keep the current checkboxes checked after submit

Posted on 2010-08-30
7
3,007 Views
Last Modified: 2012-05-10
store checked values in a session

so when form is submitted

the current checkboxes are still checked
<SCRIPT LANGUAGE="JavaScript">
<!-- 

<!-- Begin
function Check(chk)
{
if(document.myform.Check_ctr.checked==true){
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
}else{

for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
}
}

// End -->
</script>


echo "the following values have been checked"; 
<form name="myform" action="#" method="post">
<b>Scripts for Web design and programming</b><br>
<input type="checkbox" name="check_list" value="1">ASP<br>
<input type="checkbox" name="check_list" value="2">PHP<br>
<input type="checkbox" name="check_list" value="3">JavaScript<br>
<input type="checkbox" name="check_list" value="4">HTML<br>
<input type="checkbox" name="check_list" value="5">MySQL<br>

<input type="checkbox" name="Check_ctr" value="yes"
onClick="Check(document.myform.check_list)"><b>Check Control</b><br> 
<input type="submit">
</form>
<?
?>

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Comment
Question by:rgb192
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7 Comments
 
LVL 58

Expert Comment

by:cyberkiwi
ID: 33563741
Here's an example
<SCRIPT LANGUAGE="JavaScript">
<!-- 

<!-- Begin
function Check(chk)
{
if(document.myform.Check_ctr.checked==true){
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
}else{

for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
}
}

// End -->
</script>


echo "the following values have been checked"; 
<form name="myform" action="#" method="post">
<b>Scripts for Web design and programming</b><br>
<input type="checkbox" name="check_list" value="1">ASP<br>
<input type="checkbox" name="check_list" value="2">PHP<br>
<input type="checkbox" name="check_list" value="3">JavaScript<br>
<input type="checkbox" name="check_list" value="4">HTML<br>
<input type="checkbox" name="check_list" value="5">MySQL<br>

<input type="checkbox" name="Check_ctr" value="yes"
onClick="Check(document.myform.check_list)"><b>Check Control</b><br> 
<input type="submit">
</form>
<?
?>

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0
 
LVL 58

Accepted Solution

by:
cyberkiwi earned 500 total points
ID: 33563746
That didn't paste properly
<SCRIPT LANGUAGE="JavaScript">
<!-- 

<!-- Begin
function Check(chk)
{
if(document.myform.Check_ctr.checked==true){
for (i = 0; i < chk.length; i++)
chk[i].checked = true ;
}else{

for (i = 0; i < chk.length; i++)
chk[i].checked = false ;
}
}

// End -->
</script>

<?php
echo "the following values have been checked: ";
$checked="";
$a = array();
if(isset($_POST["check_list"])) {
	foreach($_POST["check_list"] as $j=>$i) {
		$checked .= ($checked==""?"":",") . "checkbox" . $i;
		array_push($a, $i);
	}
}
echo $checked;

function was_checked($i,$a) {
if(in_array($i, $a)===true) {
return "checked='checked'";
return "";
}
}
?>

<form name="myform" action="#" method="post">
<b>Scripts for Web design and programming</b><br>
<input type="checkbox" name="check_list[]" value="1" <?=was_checked(1,$a)?>>ASP<br>
<input type="checkbox" name="check_list[]" value="2" <?=was_checked(2,$a)?>>PHP<br>
<input type="checkbox" name="check_list[]" value="3" <?=was_checked(3,$a)?>>JavaScript<br>
<input type="checkbox" name="check_list[]" value="4" <?=was_checked(4,$a)?>>HTML<br>
<input type="checkbox" name="check_list[]" value="5" <?=was_checked(5,$a)?>>MySQL<br>

<input type="checkbox" name="Check_ctr" value="yes"
onClick="Check(document.myform.check_list)"><b>Check Control</b><br> 
<input type="submit">
</form>

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0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 33566370
Interesting question: Do you want the checkboxes to be remembered or do you want them to be changeable on each page?
0
WordPress Tutorial 2: Terminology

An important part of learning any new piece of software is understanding the terminology it uses. Thankfully WordPress uses fairly simple names for everything that make it easy to start using the software.

 
LVL 110

Expert Comment

by:Ray Paseur
ID: 33566384
This will remember them permanently - any check box that gets checked will be remembered across multiple pages.
<?php // RAY_checkboxes_session.php
error_reporting(E_ALL);
session_start();

// INITIALIZE SOME TEST DATA - THIS MIGHT COME FROM A DATA BASE
if (!isset($_SESSION['box1'])) $_SESSION['box1'] = FALSE;
if (!isset($_SESSION['box2'])) $_SESSION['box2'] = FALSE;
if (!isset($_SESSION['box3'])) $_SESSION['box3'] = FALSE;

// PROCESS THE POST DATA
if (isset($_POST['box1'])) $_SESSION['box1'] = TRUE;
if (isset($_POST['box2'])) $_SESSION['box2'] = TRUE;
if (isset($_POST['box3'])) $_SESSION['box3'] = TRUE;

// CREATE THE FORM
$form = <<<EOFORM
<form method="post">
CHECK OR UNCHECK SOME BOXES HERE<br/>
<input name=box1 type="checkbox" /><br/>
<input name=box2 type="checkbox" /><br/>
<input name=box3 type="checkbox" /><br/>
<input type="submit" value="go" />
</form>
EOFORM;

// REPLACE THE FORM FIELDS TO INDICATE THE CHECKED VALUES IN THE SESSION
if ($_SESSION['box1']) $form = str_replace('box1', 'box1 checked', $form);
if ($_SESSION['box2']) $form = str_replace('box2', 'box2 checked', $form);
if ($_SESSION['box3']) $form = str_replace('box3', 'box3 checked', $form);

// PRESENT THE FORM
echo $form;

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Author Closing Comment

by:rgb192
ID: 33566386
thanks
0
 
LVL 110

Expert Comment

by:Ray Paseur
ID: 33566395
This will remember them, and allow them to be changed from page to page.
<?php // RAY_checkboxes_session.php
error_reporting(E_ALL);
session_start();

// INITIALIZE SOME TEST DATA - THIS MIGHT COME FROM A DATA BASE
if (!isset($_SESSION['box1'])) $_SESSION['box1'] = FALSE;
if (!isset($_SESSION['box2'])) $_SESSION['box2'] = FALSE;
if (!isset($_SESSION['box3'])) $_SESSION['box3'] = FALSE;

// PROCESS THE POST DATA
if ( isset($_POST['box1'])) $_SESSION['box1'] = TRUE;
if ( isset($_POST['box2'])) $_SESSION['box2'] = TRUE;
if ( isset($_POST['box3'])) $_SESSION['box3'] = TRUE;

if (!isset($_POST['box1'])) $_SESSION['box1'] = FALSE;
if (!isset($_POST['box2'])) $_SESSION['box2'] = FALSE;
if (!isset($_POST['box3'])) $_SESSION['box3'] = FALSE;

// CREATE THE FORM
$form = <<<EOFORM
<form method="post">
CHECK OR UNCHECK SOME BOXES HERE<br/>
<input name=box1 type="checkbox" /><br/>
<input name=box2 type="checkbox" /><br/>
<input name=box3 type="checkbox" /><br/>
<input type="submit" value="go" />
</form>
EOFORM;

// REPLACE THE FORM FIELDS TO INDICATE THE CHECKED VALUES IN THE SESSION
if ($_SESSION['box1']) $form = str_replace('box1', 'box1 checked', $form);
if ($_SESSION['box2']) $form = str_replace('box2', 'box2 checked', $form);
if ($_SESSION['box3']) $form = str_replace('box3', 'box3 checked', $form);

// PRESENT THE FORM
echo $form;

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0
 
LVL 2

Expert Comment

by:Gatherer_Hade
ID: 33566424
This code properly stores checked values in session.  Also sets state of check control so it acts as expected.

Enjoy


<SCRIPT LANGUAGE="JavaScript">
<!-- Begin
function Check(chk)
{
	if(document.myform.Check_ctr.checked==true){
		for (i = 0; i < chk.length; i++)
			chk[i].checked = true ;
	}else{

		for (i = 0; i < chk.length; i++)
		chk[i].checked = false ;
	}
}

// End -->
</script>

<?php
//enable session
session_start();
if (count($_POST)){
	//save choices to session
        $_SESSION['check_list']=$_POST['check_list'];
}

function was_checked($i) {
  if ($_SESSION['check_list']){
	  if(in_array($i,$_SESSION['check_list']) ) {
	     return "checked='checked'";
	  }
  }
  return "";
}

function any_checked(){
  if (count($_SESSION['check_list'])){
	     return "checked='checked'";
  }
}
?>

<form name="myform" action="#" method="post">
<b>Scripts for Web design and programming</b><br>
<input type="checkbox" name="check_list[]" value="1" <?=was_checked(1)?>>ASP<br>
<input type="checkbox" name="check_list[]" value="2" <?=was_checked(2)?>>PHP<br>
<input type="checkbox" name="check_list[]" value="3" <?=was_checked(3)?>>JavaScript<br>
<input type="checkbox" name="check_list[]" value="4" <?=was_checked(4)?>>HTML<br>
<input type="checkbox" name="check_list[]" value="5" <?=was_checked(5)?>>MySQL<br>

<input type="checkbox" name="Check_ctr" value="yes" <?=any_checked()?> 
onClick="Check(document.myform.elements['check_list[]'])"><b>Check Control</b><br> 
<input type="submit">
</form>

<?php

if (count($_POST['check_list'])){
        echo "the following values have been checked"; 
	$check_list=$_POST['check_list'];
	foreach ($check_list as $check){
	  echo "<br> You checked $check";
	}
}
?>

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