How to add spinner/loader in yii2 php

I want to add a spinner/loader in one of my forms. The scenario is simple: When I hit the create button then it will show a spinner/loader. On hitting the create button a call to a web-service is made so the spinner/loader will show from call start to call end.

Below is my controller:

$m = MetersInventoryStore::findOne($_REQUEST['selected_meters']);
$msn = $m->meter_serial; // current selected meter serial number is saved

$date_time = str_replace(' ', 'T', date('Y-m-d H:i:s')); // current date time

$api_url = 'http://xx.xxx.xxx.xxx:7000/api/meters/GetByMsn/' . $msn . '/' .$date_time; // my base URL

$curl = curl_init($api_url);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
curl_setopt($curl, CURLOPT_TIMEOUT, 1000);
curl_setopt($curl, CURLOPT_HTTPHEADER, array('Authorization:key'));

$curl_response = curl_exec($curl);
$json = json_decode($curl_response);
$meter_alive = $json->data->Response;
.
.
.
.
// my other code that is saving data
.
.
.
.
return $this->render('create', ['model' => $model,]);

The submit button is below:

<div class="form-group">
   <?= Html::submitButton($model->isNewRecord ? 'Verify Communication' : 'Update', ['id'=> 'spin','name'=>'create','class' => $model->isNewRecord ? 'btn btn-success' : 'btn btn-success']) ?>

</div>

As told above when I press the Verify Communication button a call is made to the web-service and during this time I want to show a spinner/loader.

For creating/showing a spinner/loader I have searched many articles.

But none of the above articles have mentioned the full implementation details. Although I have tried each and every step mentioned in the articles.

Any help would be highly appreciated.

Instead of on the submit button why not put the loader on each page load. This can be done by making changes in main layout.

<style>
        /*loader css*/

#loader {
  position: absolute;
  left: 50%;
  top: 50%;
  z-index: 1;
  width: 150px;
  height: 150px;
  margin: -75px 0 0 -75px;
  border: 16px solid #f3f3f3;
  border-radius: 50%;
  border-top: 16px solid #3498db;
  width: 120px;
  height: 120px;
  -webkit-animation: spin 2s linear infinite;
  animation: spin 2s linear infinite;
}

@-webkit-keyframes spin {
  0% { -webkit-transform: rotate(0deg); }
  100% { -webkit-transform: rotate(360deg); }
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* Add animation to "page content" */
.animate-bottom {
  position: relative;
  -webkit-animation-name: animatebottom;
  -webkit-animation-duration: 1s;
  animation-name: animatebottom;
  animation-duration: 1s
}

@-webkit-keyframes animatebottom {
  from { bottom:-100px; opacity:0 } 
  to { bottom:0px; opacity:1 }
}

@keyframes animatebottom { 
  from{ bottom:-100px; opacity:0 } 
  to{ bottom:0; opacity:1 }
}



</style>

Add script for function.

<script>
var myVar;

function myFunction() {
  myVar = setTimeout(showPage, 0000);
}

function showPage() {
  document.getElementById("loader").style.display = "none";
  document.getElementById("container").style.display = "block";
}
</script>

Finally, call the function by binding onload function with body.

    <body onload="myFunction()">
        <div id="loader"></div>
<section id="container" style="display:none;" class="animate-bottom">
</section>
    </body>

No validation on user request

$m = MetersInventoryStore::findOne($_REQUEST['selected_meters']);

it's too much

$msn = $m->meter_serial;

do this

$api_url = 'http://xx.xxx.xxx.xxx:7000/api/meters/GetByMsn/' . $m->meter_serial . '/' .$date_time;

Curl request need to be moved to separated method

function curlRequest(msn) {
  $api_url = 'http://xx.xxx.xxx.xxx:7000/api/meters/GetByMsn/' . $msn . '/' .$date_time; // my base URL
  $curl = curl_init($api_url);
  curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
  curl_setopt($curl, CURLOPT_TIMEOUT, 1000);
  curl_setopt($curl, CURLOPT_HTTPHEADER, array('Authorization:key'));
  $curl_response = curl_exec($curl);
  $json = json_decode($curl_response); // WTF snake case only in Python

  return $json->data->Response;
}

And now answer to your question You need add click event to your button. You using Yii2 his have jQuery for more powerful DOM-tools. Use $.hide() and $.show() for you button class and draw preloader. You can use Promise if you need feedback from server of his save data.

来源：https://stackoverflow.com/questions/46828614/how-to-add-spinner-loader-in-yii2-php

标签

javascript

jquery

yii2

spinner

yii2-advanced-app