Power Pages Fundamentals #21: Power Pages CRUD Operations Guide with WebAPI: Quick Read Series

In Power Pages CRUD operations is a common scenario for any implementation with WebAPI. I will explain this step by step process with the example of creation and updating and deletion of dataverse records.

Step 1 : Go to Power Pages studio and add a new page and then provide the name as CRUD operations as shown below

Step 2 : Go to Edit code and it opens a new online visual studio code editor after authentication and use the below code to perform all the CRUD Operations

<div class="row sectionBlockLayout text-start" style="min-height: auto; padding: 8px;">
    <div class="container" style="display: flex; flex-wrap: wrap;">
      <div class="col-lg-12 columnBlockLayout" style="padding: 16px; margin: 60px 0px; min-height: 200px;">
<!-- Sample code for Web API demonstration -->
<style>
    #processingMsg {
        width: 150px;
        text-align: center;
        padding: 6px 10px;
        z-index: 9999;
        top: 0;
        left: 40%;
        position: fixed;
        -webkit-border-radius: 0 0 2px 2px;
        border-radius: 0 0 2px 2px;
        -webkit-box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
        display: none;
    }

    table td[data-attribute] .glyphicon-pencil {
        margin-left: 5px;
        opacity: 0;
    }

    table td[data-attribute]:hover .glyphicon-pencil {
        opacity: 0.7;
    }
</style>

<script>
  
  $(function() {
    //Web API ajax wrapper
    (function(webapi, $) {
      function safeAjax(ajaxOptions) {
        var deferredAjax = $.Deferred();
        shell.getTokenDeferred().done(function(token) {
          // Add headers for ajax
          if (!ajaxOptions.headers) {
            $.extend(ajaxOptions, {
              headers: {
                "__RequestVerificationToken": token
              }
            });
          } else {
            ajaxOptions.headers["__RequestVerificationToken"] = token;
          }
          $.ajax(ajaxOptions)
            .done(function(data, textStatus, jqXHR) {
              validateLoginSession(data, textStatus, jqXHR, deferredAjax.resolve);
            }).fail(deferredAjax.reject); //ajax
        }).fail(function() {
          deferredAjax.rejectWith(this, arguments); // On token failure pass the token ajax and args
        });
        return deferredAjax.promise();
      }
      webapi.safeAjax = safeAjax;
    })(window.webapi = window.webapi || {}, jQuery)
    // Notification component
    var notificationMsg = (function() {
      var $processingMsgEl = $('#processingMsg'),
        _msg = 'Processing...',
        _stack = 0,
        _endTimeout;
      return {
        show: function(msg) {
          $processingMsgEl.text(msg || _msg);
          if (_stack === 0) {
            clearTimeout(_endTimeout);
            $processingMsgEl.show();
          }
          _stack++;
        },
        hide: function() {
          _stack--;
          if (_stack <= 0) {
            _stack = 0;
            clearTimeout(_endTimeout);
            _endTimeout = setTimeout(function() {
              $processingMsgEl.hide();
            }, 500);
          }
        }
      }
    })();
    // Inline editable table component
    var webAPIExampleTable = (function() {
      var trTpl = '<% _.forEach(data, function(data){ %>' +
        '<tr data-id="<%=data.id%>" data-name="<%=data.fullname%>">' +
        '<% _.forEach(columns, function(col){ %>' +
        '<td data-attribute="<%=col.name%>" data-label="<%=col.label%>" data-value="<%=data[col.name]%>">' +
        '<%-data[col.name]%><i class="glyphicon glyphicon-pencil"></i>' +
        '</td>' +
        '<% }) %>' +
        '<td>' +
        '<button class="btn btn-default delete" type="submit"><i class="glyphicon glyphicon-trash" aria-hidden="true">Delete</i></button>' +
        '</td>' +
        '</tr>' +
        '<% }) %>';
      var tableTpl = '<table class="table table-hover">' +
        '<thead>' +
        '<tr>' +
        '<% _.forEach(columns, function(col){ %>' +
        '<th><%=col.label%></th>' +
        '<% }) %>' +
        '<th>' +
        '<button class="btn btn-default add" type="submit">' +
        '<i class="glyphicon glyphicon-plus" aria-hidden="true"></i> Add Sample Record' +
        '</button>' +
        '</th>' +
        '</tr>' +
        '</thead>' +
        '<tbody>' + trTpl + '</tbody>' +
        '</table>';
      function getDataObject(rowEl) {
        var $rowEl = $(rowEl),
          attrObj = {
            id: $rowEl.attr('data-id'),
            name: $rowEl.attr('data-name')
          };
        $rowEl.find('td').each(function(i, el) {
          var $el = $(el),
            key = $el.attr('data-attribute');
          if (key) {
            attrObj[key] = $el.attr('data-value');
          }
        })
        return attrObj;
      }
      function bindRowEvents(tr, config) {
        var $row = $(tr),
          $deleteButton = $row.find('button.delete'),
          dataObj = getDataObject($row);
        $.each(config.columns, function(i, col) {
          var $el = $row.find('td[data-attribute="' + col.name + '"]');
          $el.on('click', $.proxy(col.handler, $el, col, dataObj));
        });
        //User can delete record using this button
        $deleteButton.on('click', $.proxy(config.deleteHandler, $row, dataObj));
      }
      function bindTableEvents($table, config) {
        $table.find('tbody tr').each(function(i, tr) {
          bindRowEvents(tr, config);
        });
        $table.find('thead button.add').on('click', $.proxy(config.addHandler, $table));
      }
      return function(config) {
        var me = this,
          columns = config.columns,
          addHandler = config.addHandler,
          deleteHandler = config.deleteHandler,
          $table;
        me.render = function(el) {
          $table = $(el).html(_.template(tableTpl)({
            columns: columns,
            data: me.data
          })).find('table');
          bindTableEvents($table, {
            columns: columns,
            addHandler: addHandler,
            deleteHandler: deleteHandler
          });
        }
        me.addRecord = function(record) {
          $table.find('tbody tr:first').before(_.template(trTpl)({
            columns: columns,
            data: [record]
          }));
          bindRowEvents($table.find('tbody tr:first'), config);
        }
        me.updateRecord = function(attributeName, newValue, record) {
          $table.find('tr[data-id="' + record.id + '"] td[data-attribute="' + attributeName + '"]').text(newValue);
        }
        me.removeRecord = function(record) {
          $table.find('tr[data-id="' + record.id + '"]').fadeTo("slow", 0.7, function() {
            $(this).remove();
          });
        }
      };
    })();
    //Applicaton ajax wrapper 
    function appAjax(processingMsg, ajaxOptions) {
      notificationMsg.show(processingMsg);
      return webapi.safeAjax(ajaxOptions)
        .fail(function(response) {
          if (response.responseJSON) {
            alert("Error: " + response.responseJSON.error.message)
          } else {
            alert("Error: Web API is not available... ")
          }
        }).always(notificationMsg.hide);
    }
    function loadRecords() {
      return appAjax('Loading...', {
        type: "GET",
        url: "/_api/contacts?$select=fullname,firstname,lastname,emailaddress1,telephone1",
        contentType: "application/json"
      });
    }
    function addSampleRecord() {
      //Sample data to create a record - change as appropriate
      var recordObj = {
        firstname: "Willie",
        lastname: "Huff" + _.random(100, 999),
        emailaddress1: "Willie.Huff@contoso.com",
        telephone1: "555-123-4567"
      };
      appAjax('Adding...', {
        type: "POST",
        url: "/_api/contacts",
        contentType: "application/json",
        data: JSON.stringify(recordObj),
        success: function(res, status, xhr) {
          recordObj.id = xhr.getResponseHeader("entityid");
          recordObj.fullname = recordObj.firstname + " " + recordObj.lastname;
          table.addRecord(recordObj);
        }
      });
      return false;
    }
    function deleteRecord(recordObj) {
      var response = confirm("Are you sure, you want to delete \"" + recordObj.name + "\" ?");
      if (response == true) {
        appAjax('Deleting...', {
          type: "DELETE",
          url: "/_api/contacts(" + recordObj.id + ")",
          contentType: "application/json",
          success: function(res) {
            table.removeRecord(recordObj);
          }
        });
      }
      return false;
    }
    function updateRecordAttribute(col, recordObj) {
      var attributeName = col.name,
        value = recordObj[attributeName],
        newValue = prompt("Please enter \"" + col.label + "\"", value);
      if (newValue != null && newValue !== value) {
        appAjax('Updating...', {
          type: "PATCH",
          url: "/_api/contacts(" + recordObj.id + ")/" + attributeName,
          contentType: "application/json",
          data: JSON.stringify({
            "value": newValue
          }),
          success: function(res) {
            table.updateRecord(attributeName, newValue, recordObj);
          }
        });
      }
      return false;
    }
    var table = new webAPIExampleTable({
      columns: [{
        name: 'firstname',
        label: 'First Name',
        handler: updateRecordAttribute
      }, {
        name: 'lastname',
        label: 'Last Name',
        handler: updateRecordAttribute
      }, {
        name: 'emailaddress1',
        label: 'Email',
        handler: updateRecordAttribute
      }, {
        name: 'telephone1',
        label: 'Telephone',
        handler: updateRecordAttribute
      }],
      data: [],
      addHandler: addSampleRecord,
      deleteHandler: deleteRecord
    });
    loadRecords().done(function(data) {
      table.data = _.map(data.value, function(record){
        record.id = record.contactid;
        return record;
      });
      table.render($('#dataTable'));
    });
  });
</script>
<div id="processingMsg" class="alert alert-warning" role="alert"></div>
<div id="dataTable"></div>


      </div>
    </div>
  </div>

Step 3 : After step 2, just save and sync page and you should see below UI where user can easily perform CRUD Operations