Solved

php drop down listing

Posted on 2016-08-19
5
59 Views
Last Modified: 2016-08-19
I use Drop-Down List for my user to select the products
I have 3 products, every products has 2-11 models,
I'd like to show to my users if they choose the first product, the user should see the related models of my first products on the second drop-down list.  

Do you have a php instruction for this model?
0
Comment
Question by:Braveheartli
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
  • 2
5 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 41762082
actually, to make it efficient, it is "not" php doing this, at least not on the "drop down" change.
see this article, for example, on how to make this efficient for the user:
https://www.experts-exchange.com/articles/18556/Using-a-drop-down-box-to-populate-a-second-drop-down-box.html
0
 
LVL 1

Author Closing Comment

by:Braveheartli
ID: 41762099
thank you Guy Hengel angelIII / a3
0
 
LVL 58

Expert Comment

by:Julian Hansen
ID: 41762142
This is not a php question - but a javascript one.

You are talking about linked drop downs - you need to provide all your options as a javascript data structure OR through callbacks to the server. You then need to setup event notifications on the change of each select to populate the next in the group.

I have put together a sample which you can view here. The sample demonstrates how to populate both from a JavaScript structure as well as getting data from the server.
HTML
  <form class="form form-horizontal">
    Get from server <input type="checkbox" name="server" id="server" /><br/>
    <div class="form-group">
      <label for="company" class="col-sm-2 control-label">Company</label>
      <div class="col-sm-10">
        <select id="company" name="company" class="form-control linked-dropdown" data-linked="make">
          <option value="">-- Select Product --</option>
          <option value="1">Product1</option>
          <option value="2">Product2</option>
          <option value="3">Product3</option>
        </select>
      </div>
    </div>
    <div class="form-group">
      <label for="make" class="col-sm-2 control-label">Make</label>
      <div class="col-sm-10">
        <select id="make" name="make" class="form-control linked-dropdown" data-linked="model"></select>
      </div>
    </div>
    <div class="form-group">
      <label for="model" class="col-sm-2 control-label">Model</label>
      <div class="col-sm-10">
        <select id="model" name="model" class="form-control"></select>
      </div>
    </div>
  </form>

Open in new window

JQuery
<script>
var options = {
  make: {
    1:{
      1: 'Prod1Make1',
      2: 'Prod1Make2',
      3: 'Prod1Make3'
    },
    2:{
      4: 'Prod2Make1',
      5: 'Prod2Make2',
      6: 'Prod2Make3'
    },
    3 :{
      7: 'Prod2Make1',
      8: 'Prod2Make2',
      9: 'Prod2Make3'
    }
  },
  model: {
    1: {
      1: 'Prod1Make1Model1',
      2: 'Prod1Make1Model2',
      3: 'Prod1Make1Model3'
    },
    2: {
      4: 'Prod1Make2Model1',
      5: 'Prod1Make2Model2',
      6: 'Prod1Make2Model3'
    },
    3: {
      7: 'Prod1Make3Model1',
      8: 'Prod1Make3Model2',
      9: 'Prod1Make3Model3'
    },
    4: {
      10: 'Prod2Make1Model1',
      11: 'Prod2Make1Model2',
      12: 'Prod2Make1Model3'
    },
    5: {
      13: 'Prod2Make2Model1',
      14: 'Prod2Make2Model2',
      15: 'Prod2Make2Model3'
    },
    6: {
      16: 'Prod2Make3Model1',
      17: 'Prod2Make3Model2',
      18: 'Prod2Make3Model3'
    },
    7: {
      19: 'Prod3Make1Model1',
      20: 'Prod3Make1Model2',
      21: 'Prod3Make1Model3'
    },
    8: {
      22: 'Prod3Make2Model1',
      23: 'Prod3Make2Model2',
      24: 'Prod3Make2Model3'
    },
    9: {
      25: 'Prod1Make3Model1',
      26: 'Prod1Make3Model2',
      27: 'Prod1Make3Model3'
    }
  }
};

$(function() {
  $('.linked-dropdown').change(function() {
    // GET THE id OF THE NEXT DROPDOWN
    // IN THE CHAIN
    var linked = $(this).data('linked');
    
    // CREATE THE SELECTOR
    var target = '#' + linked;
  
    // EMPTY THE TARGET
    $(target).empty();
    
    // EMPTY ALL THE CHILDREN
    var child = $(target).data('linked');
    while (child) {
      $('#' + child).empty();
      child = $('#' + child).data('linked');
    }
    
    // ARE WE GETTING THIS FROM THE SERVER
    // OR USING LOCAL ARRAY
    if ($('#server').is(':checked')) {
    
      // SERVER SEND AJAX CALL AND 
      // POPULATE WITH RESPONSE
      $.ajax({
        url: 't1496.php',
        data: {
          linked: linked,
          value: $(this).val()
        },
        type: "POST",
        dataType: "html"
      }).then(function(resp) {
      
        // SERVER BUILDS HTML RETURN
        // WE JUST INSERT IT
        $(target).html(resp);
      });
    }
    else {
      // GET THE SELECTED VALUE
      var val = $(this).val();
      // AND USE THIS TO GET THE CORRESPONDING
      // ARRAY OF OPTIONS
      opts = options[linked][val];
    
      // INSERT THE INSTRUCTION OPTION
      $(target).append($('<option/>').val('').html('-- Select --'));
      
      // LOOP THROUGH THE TARGET OPTIONS AND ADD THEM
      $.each(opts, function(v,o) {
        $(target).append($('<option/>').html(o).val(v))
      });
    }
  });
});
</script>

Open in new window

PHP
<?php

$options = array (
  'make' => array (
    1 => array (
      1 => 'Server-Prod1Make1',
      2 => 'Server-Prod1Make2',
      3 => 'Server-Prod1Make3'
    ),
    2=> array (
      4=> 'Server-Prod2Make1',
      5=> 'Server-Prod2Make2',
      6=> 'Server-Prod2Make3'
    ),
    3 => array (
      7=> 'Server-Prod2Make1',
      8=> 'Server-Prod2Make2',
      9=> 'Server-Prod2Make3'
    )
  ),
  'model' => array (
    1=> array (
      1=> 'Server-Prod1Make1Model1',
      2=> 'Server-Prod1Make1Model2',
      3=> 'Server-Prod1Make1Model3'
    ),
    2=> array (
      4=> 'Server-Prod1Make2Model1',
      5=> 'Server-Prod1Make2Model2',
      6=> 'Server-Prod1Make2Model3'
    ),
    3=> array (
      7=> 'Server-Prod1Make3Model1',
      8=> 'Server-Prod1Make3Model2',
      9=> 'Server-Prod1Make3Model3'
    ),
    4=> array (
      10=> 'Server-Prod2Make1Model1',
      11=> 'Server-Prod2Make1Model2',
      12=> 'Server-Prod2Make1Model3'
    ),
    5=> array (
      13=> 'Server-Prod2Make2Model1',
      14=> 'Server-Prod2Make2Model2',
      15=> 'Server-Prod2Make2Model3'
    ),
    6=> array (
      16=> 'Server-Prod2Make3Model1',
      17=> 'Server-Prod2Make3Model2',
      18=> 'Server-Prod2Make3Model3'
    ),
    7=> array (
      19=> 'Server-Prod3Make1Model1',
      20=> 'Server-Prod3Make1Model2',
      21=> 'Server-Prod3Make1Model3'
    ),
    8=> array (
      22=> 'Server-Prod3Make2Model1',
      23=> 'Server-Prod3Make2Model2',
      24=> 'Server-Prod3Make2Model3'
    ),
    9=> array (
      25=> 'Server-Prod1Make3Model1',
      26=> 'Server-Prod1Make3Model2',
      27=> 'Server-Prod1Make3Model3'
    )
  )
);

$val = isset($_POST['value']) ? intval($_POST['value']) : false;
$linked = isset($_POST['linked']) ? $_POST['linked'] : false;
if ($val && $linked) {
  $opt = $options[$linked][$val];
  $return = <<< OPTION
      <option value="">-- Select --</option>

OPTION;
  foreach($opt as $v => $o) {
    $return .= <<< OPTION
      <option value="{$v}">{$o}</option>
OPTION;
  }
  
  echo $return;
}

Open in new window

1
 
LVL 1

Author Comment

by:Braveheartli
ID: 41762151
wow, that's even better... thank you very much Julian Hansen,
0
 
LVL 58

Expert Comment

by:Julian Hansen
ID: 41762210
You are welcome.
0

Featured Post

[Webinar] Learn How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Password hashing is better than message digests or encryption, and you should be using it instead of message digests or encryption.  Find out why and how in this article, which supplements the original article on PHP Client Registration, Login, Logo…
By, Vadim Tkachenko. In this article we’ll look at ClickHouse on its one year anniversary.
The viewer will learn how to look for a specific file type in a local or remote server directory using PHP.
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…

617 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question