Cakephp Ajax drop down menu, one drop down list populate the next

This is how you create a ajax drop down menu, where the first drop down list populates the next

Cakephp Ajax drop down menu, one drop down list populate the next

This is how you create a ajax drop down menu, where the first drop down list populates the next

at the top of your page add the following javascript

<script type="text/javascript">

function changeContent(str)

{

if (str=="")

  {

    // if blank, we'll set our innerHTML to be blank.

    document.getElementById("ajaxcontent").innerHTML="";

    return;

  }

if (window.XMLHttpRequest)

    {    // code for IE7+, Firefox, Chrome, Opera, Safari

        // create a new XML http Request that will go to our generator webpage.

        xmlhttp=new XMLHttpRequest();

    }

else

    {    // code for IE6, IE5

        // create an activeX object

        xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");

    }

    // on state change

    xmlhttp.onreadystatechange=function()

    {

    // if we get a good response from the webpage, display the output

    if (xmlhttp.readyState==4 && xmlhttp.status==200)

    {

        document.getElementById("ajaxcontent").innerHTML=xmlhttp.responseText;

    }

  }

 // use our XML HTTP Request object to send a get to our content php.

xmlhttp.open("GET","getproducts?metal_id="+str, true);

xmlhttp.send();

} 

</script>

Now in your first drop down box include the call to this javascript code like so:

The id ajaxcontent is where our ajax is going to load the next drop down list

 echo $this->Form->input('metal_id', ['options' => $metals, 'class'=>'form-control', 'label' => 'Select a Metal', 'placeholder'=>'metal_id', 'empty' => '--Select--', 'onchange'=>"changeContent(this.value)"]);

<div id="ajaxcontent">--Select one above--</div>

Notice that we set the layout to ajax, as we don't want to include any other html in the return

        public function getproducts()

    {

        

        $metal_id = $_REQUEST['metal_id'];

                

        $this->loadModel('Products');

        

        $products = $this->Products->find('all', [ 

          'conditions'=>['Products.metal_id'=>$metal_id]

        ]);

        

        $pro = array();        

        foreach($products as $product) {

         $pro[$product['id']] = $product['name'];

        

        }                

                

        $this->set('products', $pro);

        $this->viewBuilder()->layout('ajax');

    }

 

The view for this function looks now like this, and if you want you can call a third drop down list here aswell 

<?php echo $this->Form->input('product_id', ['options' => $products, 'class'=>'form-control', 'label' => 'Select a Product', 'empty' => '--Select--', 'placeholder'=>'product_id', 'onchange'=>"changePicture(this.value)"]);   ?>

Second way of doing it

function getProducts(weight_id) {


var metal_id = $('#metal').val();

var type_id = $('#type').val();



  $("#loader").show();

    $.ajax({

    type: "POST",

    url: "getproducts",

  data: { metal_id: metal_id, type_id: type_id, weight_id: weight_id },

    success: function(data){

        $("#showproducts").html(data);

        $("#loader").hide();

    }

    });

}

 

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