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jquery chained selects

Posted on 2008-10-22
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Last Modified: 2013-12-13
Hello
note: sorry for my english
OK , I try to use a library jquery and plugin jquery chained select, but i have 2 problem:
1. how i can get data from database mysql?
i post code php :
******************************PHP
<?php
$array = array();
if ($_GET['_name'] == 'tipglass1')
{
       if ( $_GET['_value'] == 0 ) {// . . . . . . . . . . . . . . . . . . . . . . nullo
            //$array[] = array('0' => 'Seleziona una tipologia');      
        } elseif ( $_GET['_value'] == 1 )  {      // . . . . . . . . . . . . . . . . . . . monolitico
            $array[] = array('1' => '4 chiaro');
            $array[] = array('2' => '5 chiaro');      
            $array[] = array('3' => '6 chiaro');
        } else {                                                // . . . . . . . . . . . . . . . . . . . mstratificato
            $array[] = array('1' => 'selezionare il numero di pannelli del primo vetro stratificato');
        }
}
echo json_encode( $array );
?>
***************************************************


2. into code jquery how i can hidden the second selectbox when the first is unselect?
Now i post the code here:
***********************************
<script language="JavaScript" type="text/javascript" src="js/jquery.js"></script>
<script language="JavaScript" type="text/javascript" src="js/jquery.chainedSelects.js"></script>
<script language="JavaScript" type="text/javascript">
$(function()
{

      $('#tipglass1').chainSelect('#glass1','query/queryglass1.php',
      
      {
            before:function (target) //before request hide the target combobox and display the loading message
            {
                  $("#loading").css("display","block");
                  $(target).css("display","none");
                  $("#glass1_li").css("display","none");
            },
            after:function (target) //after request show the target combobox and hide the loading message
            {
                  $("#loading").css("display","none");
                  $(target).css("display","inline");
                  $("#glass1_li").css("display","inline");
                        
                  
                  
            }
            
      });
      
});
</script>

****************************

reghards,
Denny
0
Comment
Question by:denny3d
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5 Comments
 
LVL 16

Expert Comment

by:sh0e
ID: 22797748
1.  
You will have to grab the data from the MySQL database and then encode it as JSON data.
This will require querying the database and then putting it into a form that can be JSON encoded.  I recommend you create a separate topic for that.

2.
Not sure what you mean by "unselect".  One of the options has to be selected.
Do you mean when you select an option with no value or value=0?:
<script language="JavaScript" type="text/javascript" src="js/jquery.js"></script>
<script language="JavaScript" type="text/javascript" src="js/jquery.chainedSelects.js"></script>
<script language="JavaScript" type="text/javascript">
$(function()
{
 
      $('#tipglass1').chainSelect('#glass1','query/queryglass1.php',
      
      {
            before:function (target) //before request hide the target combobox and display the loading message
            {
                  $("#loading").css("display","block");
                  $(target).css("display","none");
                  $("#glass1_li").css("display","none");
            },
            after:function (target) //after request show the target combobox and hide the loading message
            {
                  $("#loading").css("display","none");
                  $(target).css("display","inline");
                  $("#glass1_li").css("display","inline");
                  if(!$this.val() || this.val() == 0) $(target).hide();
            }
            
      });
      
});
</script>

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Author Comment

by:denny3d
ID: 22801919
ok for the second question:

if I add
if(!$this.val() || this.val() == 0) $(target).hide();

i have this problem:

$this.val = not defined

I must:
if result of first select box = 0 , hide $("#glass1_li")
else
$("#glass1_li").css("display","inline");
0
 
LVL 16

Expert Comment

by:sh0e
ID: 22802171
Typo
if(!($(this).val()) || $(this).val() == 0) $(target).hide();
0
 

Author Comment

by:denny3d
ID: 22802220
no its not work.
I post code so you understand:




I would that if into selectbox id="tipglass1" the value selected is != 0  the id="glass1_li" is display:inline,
while if id="tipglass1" the value selected is == 0 the id="glass1_li" is visible display:none.


html file
<script language="JavaScript" type="text/javascript">
$(function()
{
 
	$('#tipglass1').chainSelect('#glass1','query/queryglass1.php',
	
	{
		before:function (target) //before request hide the target combobox and display the loading message
		{ 
			$("#loading").css("display","block");
			$(target).css("display","none");
			$("#glass1_li").css("display","none");
		},
		after:function (target) //after request show the target combobox and hide the loading message
		{ 
			$("#loading").css("display","none");
			$(target).css("display","inline");
			$("#glass1_li").css("display","inline");
			}
	});
	
});
</script>
</head>
<body>
 
<div id="loading">Loading ...</div>
 
<h2>VETRA CAMERA DOPPIO COMPOSIZIONE</h2>
 
<form name="dgu" method="post" action="">
	<fieldset>
    <legend>Vetro Camera doppio</legend>
    	<ol>
    		<li>
                <label>Tipologia glass 1:</label>
                <!-- tipology combobox -->
                <select id="tipglass1" name="tipglass1">
                <option value="0" selected>- seleziona -</option>
                <option value="1">Monolitico</option>
                <option value="2">Stratificato</option>
                </select>
		    </li>
    		<li id="glass1_li" style="display:none">
                <label>glass 1:</label>
                <select name="glass1" id="glass1" style="display:none" ></select>
			</li>
    	</ol>
    </fieldset>
</form>
 
 
*****************js file selecbox
jQuery.fn.chainSelect = function( target, url, settings ) 
{
  return this.each( function()
  {
	$(this).change( function( ) 
	{
		settings = jQuery.extend(
		{
			after : null,
			before : null,
			usePost : false,
			defaultValue : null,
			parameters : {'_id' : $(this).attr('id'), '_name' : $(this).attr('name'), '_nr' : $(this).attr('number')}
        } , settings);
 
		settings.parameters._value =  $(this).val();
 
		if (settings.before != null) 
		{
			settings.before( target );
		}
 
		ajaxCallback = function(data, textStatus) 
		{
			$(target).html("");//clear old options
			data = eval(data);//get json array
			for (i = 0; i < data.length; i++)//iterate over all options
			{
			  for ( key in data[i] )//get key => value
			  {	
					$(target).get(0).add(new Option(data[i][key],[key]), document.all ? i : null);
              }
			}
 
			if (settings.defaultValue != null)
			{
				$(target).val(settings.defaultValue);//select default value
			} else
			{
				$("option:first", target).attr( "selected", "selected" );//select first option
			}
 
			if (settings.after != null) 
			{
				settings.after(target);
			}
 
			$(target).change();//call next chain
		};
 
		if (settings.usePost == true)
		{
			$.post( url, settings.parameters, ajaxCallback );
		} else
		{
			$.get( url, settings.parameters, ajaxCallback );
		}
	});
  });
};
 
*****************phpfile
<?php
$array = array();
if ($_GET['_name'] == 'tipglass1') 
{
	 if ( $_GET['_value'] == 0 ) {// . . . . . . . . . . . . . . . . . . . . . . nullo
		//$array[] = array('0' => 'Seleziona una tipologia');	
	  } elseif ( $_GET['_value'] == 1 )  {	// . . . . . . . . . . . . . . . . . . . monolitico
		$array[] = array('1' => '4 chiaro');
		$array[] = array('2' => '5 chiaro');	
		$array[] = array('3' => '6 chiaro');
	  } else {								// . . . . . . . . . . . . . . . . . . . mstratificato
		$array[] = array('1' => 'selezionare il numero di pannelli del primo vetro stratificato');
	  }
}
echo json_encode( $array );
?>

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LVL 16

Accepted Solution

by:
sh0e earned 1500 total points
ID: 22802254
Should do as you describe.
I won't be around for a while, but for anyone else who can help him.

The plugin is here.
http://codeassembly.com/Simple-chained-combobox-plugin-for-jQuery/

It's a hierarchical select, that renders JSON data.
if($('#tipglass1').val() != 0) $('#glass1_li').css('display','inline');
 
if($('#tipglass1').val() == 0) $('#glass1_li').css('display','none');

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