Criar uma página do Visualforce que executa a ação

A página do Visualforce chama os métodos definidos na classe do controlador do Apex para invocar a ação e fornecer um status das tarefas.

1. Em configuração, insira Visualforce na caixa Busca rápida.
2. Selecione Páginas do Visualforce.
3. Clique em Novo.
4. Insira o rótulo e a descrição da página do Visualforce.
   
5. Substitua a marcação existente por esse código.

   <apex:page controller="CreateOpportunitiesController" action="{!init}" showheader="false" sidebar="false" standardStylesheets="false" title="Create Opportunities" >
       <apex:stylesheet value="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css"/>
   
   /* Use jQuery to process API calls */
       <apex:includeScript value="https://code.jquery.com/jquery-3.1.0.min.js"/>
       <style>
           th {
               width: 50%;
           }
           h4 {
               font-size: 24px;
           }
           table {
               font-size: 20px;
               width: 100%;
           }
       </style>
       <div class="container-fluid">
   
   /* Add HTML table to the Visualforce page that shows the accounts, the opportunity creation status, and then finally the new opportunity name */
           <h4 id="message">Querying Accounts...</h4>
           <table name="results" id="results" data-role="table" class="table-bordered table-striped table-responsive">
               <thead><tr><th>Account</th><th>Opportunity</th></tr></thead>
               <tbody></tbody>
           </table>
       </div>
       
       <script>
           $(function() {
               $.ajaxSetup({
                   headers: {"Authorization": 'Bearer {!$Api.Session_ID}'}
               });
               
               setTimeout(executeQuery, 1000);
           });
   
   /* Executes the SAQL query and displays the resulting accounts. Note: Account.Name and AccountId referenced below refer to the dataset field names. Update them to match your dataset fields. */                
           function executeQuery() {
               // Replace this with the actual SAQL query needed to fetch data for this page
               var query = {};
               query.statements = "{!JSENCODE(query)}";
               var queryObj = {query: query.statements};
               $.ajax({
                   type: 'POST',
                   url: '/services/data/v39.0/wave/query',
                   data: JSON.stringify(queryObj),
                   contentType: 'application/json',
                   success: function(data) {
                       $('#message').html('Creating Opportunities...');
                       var record = null;
                       var row = null;
                       $('#results tbody').empty();
                       
                       for (var i = 0; i < data.results.records.length; i++) {
                           record = data.results.records[i];
                           row = $('<tr>');
                           row.append($('<td>').html(record['Account.Name']));
                           row.append($('<td class="' + record.AccountId + '">').html('Creating...'));
                           $('#results tbody').append(row);
                       }
                       
                       setTimeout(function() {createOpportunities(data.results.records);}, 1000);
                   },
               });
           }
   
   /* Calls the Apex controller method that creates opportunities for each account and returns the opportunity name for each account to the HTML table. */
           function createOpportunities(accountRecords) {
               CreateOpportunitiesController.create(accountRecords, function(result, event) {
                   console.log(result);
                   if (event.status) {
                       for (var i = 0; i < accountRecords.length; i++) {
                           $('td.' + accountRecords[i].AccountId).html(result[accountRecords[i].AccountId]);
                       }
                       $('#message').html(accountRecords.length + ' Opportunities Created');
                   }
                   else {
                       $('#message').html('Error: ' + event.message);
                   }
               });
           }
       </script>
   </apex:page>

6. Clique em Salvar.