CodeIgniter and Google charts - dropdown based on mysql values - php

Question

I am using code igniter, google charts with php and MySQL to display charts. It works using fixed query. I am trying to add a dropdown to display the chart based on the option (sql column "status") selected
Here is what I have so far. How can I modify this to accept dropdown values?
model.php
public function get_chart_data()
{
$query = $this->db->get($this->db_mgmt);
$this->db->select('rating, COUNT(rating) AS Count');
$this->db->from('db_mgmt');
$this->db->where('status =', $status);
$this->db->group_by('rating');
$query = $this->db->get();
$results['chart'] = $query->result();
}
controller.php
$this->load->model('model', 'chart');
public function index() {
$results = $this->chart->get_chart_data();
$data['chart'] = $results['chart'];
$this->load->view('index.php', $data);
}
view.php
<?php
foreach ($chart as $object) {
$open_all[] = "['".$object->rating."', ".$object->Count."]";
}
?>
google.load("visualization", "1", {packages:["corechart"]});
google.setOnLoadCallback(drawChart_open);
function drawChart_open() {
// Create the data table.
var data = new google.visualization.DataTable();
data.addColumn('string', 'Rating');
data.addColumn('number', 'Count');
data.addRows([
<?php echo implode(",", $open_all);?>
]);
var options = {
pieSliceText: 'value-and-percentage',
};
var chart = new google.visualization.PieChart(document.getElementById('open_div'));
chart.draw(data, options);
}
<div id="open_div" class="chart"></div>
Thanks in advance!
UPDATE:
I have tried the below using ajax but it doesn't seem to work. I am definitely sure I am doing something wrong here but not sure where. Using Inspect in chrome also doesn't give any errors.
model.php
public function fetch_result($status)
{
$query = $this->db->get($this->db_mgmt);
$this->db->select('rating, COUNT(status) AS Status_Count');
$this->db->from('db__mgmt');
$this->db->where('status =', $status);
$this->db->group_by('rating');
$query = $this->db->get();
return $query;
}
controller.php
$this->load->model('model', 'chart');
public function mychart() {
if(!empty($_POST["val"])) {
$val=$_POST["val"];
$result_new=$this->chart->fetch_result($val);
$array = array();
$cols = array();
$rows = array();
$cols[] = array("id"=>"","label"=>" Rating","pattern"=>"","type"=>"string");
$cols[] = array("id"=>"","label"=>"Count","pattern"=>"","type"=>"number");
foreach ($result_new as $object) {
$rows[] = array("c"=>array(array("v"=>$object->risk_rating,"f"=>null),array("v"=>(int)$object->Status_Count,"f"=>null)));
}
$array = array("cols"=>$cols,"rows"=>$rows);
echo json_encode($array);
}
}
view.php
function drawChart_open_all(num) {
var PieChartData = $.ajax({
type: "POST",
url: "<?php echo base_url(); ?>" + "dashboard/chart/mychart",
data:'val='+num,
dataType:"json"
}).responseText;
alert(PieChartData);
// Create the data table.
var data = new google.visualization.DataTable(PieChartData);
var options = {
pieSliceText: 'value-and-percentage',
};
var chart = new google.visualization.PieChart(document.getElementById('open_new'));
chart.draw(data, options);
}
<div><span> <b>Pie Chart<br /><br /></span></div>
<form>
<select name="status" onchange="drawChart_open_all(this.value)">
<option value="WIP">WIP</option>
<option value="Close">Close</option>
</select>
</form>
<div id="open_new" class="chart"></div>
Thanks in advance!!

Answer 1

I think the easiest thing would be to send a GET request with the <option> value
First, go back to your first version.
Next, send the value in your onchange event
function drawChart_open_all(num) {
location = "<?php echo base_url(); ?>" + "dashboard/chart/mychart?option=" + num;
}
Then in Model --
get_chart_data()
you should be able to access the value with --
$_GET['option']
use that to modify your query
here's an old answer with similar concept -- difference is it uses POST vs. GET
and a <form> with a <input type="submit"> button to send the request
How to pass JavaScript variables to PHP?

Answer 2

I managed to figure out what the problem was and used ajax in the end. #WhiteHat solution led to also in the right direction. Thanks for that!
model.php
public function fetch_result($status)
{
$query = $this->db->get($this->db_mgmt);
$this->db->select('rating, COUNT(status) AS status_count');
$this->db->from('db_mgmt');
$this->db->where('status =', $status);
$this->db->group_by('rating');
$query = $this->db->get();
$results_new = $query->result(); // <-- Forgot to add this!
return $results_new;
}
controller.php
$this->load->model('model', 'chart');
public function mychart() {
if(!empty($_POST['option'])) {
$val = $_POST['option'];
$result_new=$this->chart->fetch_result($val);
$array = array();
$cols = array();
$rows = array();
$cols[] = array("id"=>"","label"=>" Rating","pattern"=>"","type"=>"string");
$cols[] = array("id"=>"","label"=>"Count","pattern"=>"","type"=>"number");
foreach ($result_new as $object) {
$rows[] = array("c"=>array(array("v"=>(string)$object->rating),array("v"=>(int)$object->status_count)));
}
$array = array("cols"=>$cols,"rows"=>$rows);
echo json_encode($array);
}
}
view.php
function drawChart_open_all(status) {
var PieChartData = $.ajax({
type: 'POST',
url: "<?php echo base_url(); ?>" + "dashboard/chart/mychart",
data: { 'option':status }, // <-- kept as option instead of val
dataType:"json",
global: false, // <-- Added
async:false, // <-- Added
success: function(data){ // <-- Added
return data; // <-- Added
},
error: function(xhr, textStatus, error){
console.log(xhr.statusText);
console.log(textStatus);
console.log(error);
}
}).responseText;
// Create the data table.
var data = new google.visualization.DataTable(PieChartData);
var options = { pieSliceText: 'value-and-percentage', };
var chart = new google.visualization.PieChart(document.getElementById('open_new'));
chart.draw(data, options);
}
<div><span> <b>Pie Chart<br /><br /></span></div>
<form>
<select name="status" onchange="drawChart_open_all(this.value)">
<option value="WIP">WIP</option>
<option value="Close">Close</option>
</select>
</form>
<div id="open_new" class="chart"></div>