6pac · 6pac · Feb 2, 2021 · Jan 21, 2021 · Jan 21, 2021 · Jan 21, 2021
diff --git a/cypress/integration/example-optimizing-updates.spec.js b/cypress/integration/example-optimizing-updates.spec.js
@@ -0,0 +1,101 @@
+/// <reference types="Cypress" />
+
+describe('Example - Optimizing Updates', () => {
+  const titles = ['#', 'Severity', 'Time', 'Message'];
+
+  beforeEach(() => {
+    // create a console.log spy for later use
+    cy.window().then((win) => {
+      cy.spy(win.console, "log");
+    });
+  });
+
+  it('should display Example Multi-grid Basic', () => {
+    cy.visit(`${Cypress.config('baseExampleUrl')}/example-optimizing-updates.html`);
+    cy.get('.options-panel > b').should('contain', 'Description:');
+    cy.contains('This page demonstrates how the bulk update operations ');
+  });
+
+  it('should have exact Column Titles in the grid', () => {
+    cy.get('#myGrid')
+      .find('.slick-header-columns')
+      .children()
+      .each(($child, index) => expect($child.text()).to.eq(titles[index]));
+  });
+
+  it('should show initial rows', () => {
+    cy.get('#pager')  
+      .find('.slick-pager-status')
+      .should('contain', 'Showing all 300 rows');    
+  });
+
+  it('should update the rows on inefficient click', () => {
+    cy.visit(`${Cypress.config('baseExampleUrl')}/example-optimizing-updates.html`);
+
+    cy.get('#myGrid')  
+      .find('.slick-row')
+      .each(($child, index) => {
+          const message = $child.find('.cell-message').text();
+          const number = parseInt(message.substring("Log Entry ".length));
+          expect(number).to.be.lessThan(1000)
+      });
+
+    cy.get('.options-panel button')  
+      .contains('inefficient')
+      .click();
+
+    cy.get('#myGrid')  
+      .find('.slick-row')
+      .each(($child, index) => {
+          const message = $child.find('.cell-message').text();
+          const number = parseInt(message.substring("Log Entry ".length));
+          expect(number).to.be.greaterThan(90000)
+      });
+  });
+
+  it('should update the rows on efficient click', () => {
+    cy.visit(`${Cypress.config('baseExampleUrl')}/example-optimizing-updates.html`);
+
+    cy.get('#myGrid')  
+      .find('.slick-row')
+      .each(($child, index) => {
+          const message = $child.find('.cell-message').text();
+          const number = parseInt(message.substring("Log Entry ".length));
+          expect(number).to.be.lessThan(1000)
+      });
+
+    cy.get('.options-panel button')  
+      .contains('efficient')
+      .click();
+
+    cy.get('#myGrid')  
+      .find('.slick-row')
+      .each(($child, index) => {
+          const message = $child.find('.cell-message').text();
+          const number = parseInt(message.substring("Log Entry ".length));
+          expect(number).to.be.greaterThan(90000)
+      });
+  });
+
+  it('should need less time on efficient than inefficient', () => {
+    cy.visit(`${Cypress.config('baseExampleUrl')}/example-optimizing-updates.html`);
+
+    cy.get('#duration').invoke('text', '').should('be.empty');
+    cy.get('.options-panel button')  
+      .contains('(inefficient)')
+      .click();
+    cy.get('#duration').should('not.be.empty').then($duration => {
+        let inEfficientTime = parseInt($duration.text());
+
+        cy.get('#duration').invoke('text', '').should('be.empty');
+        cy.get('.options-panel button')  
+          .contains('(efficient)')
+          .click();
+        cy.get('#duration').should('not.be.empty').then($duration2 => {
+            let efficientTime = parseInt($duration2.text());
+            expect(efficientTime).to.be.lessThan(inEfficientTime / 2);
+        });
+    });
+
+  });
+});
diff --git a/examples/example-optimizing-updates.html b/examples/example-optimizing-updates.html
@@ -0,0 +1,182 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
+  <link rel="shortcut icon" type="image/ico" href="favicon.ico" />
+  <title>SlickGrid example: Optimizing Updates</title>
+  <link rel="stylesheet" href="../slick.grid.css" type="text/css"/>
+  <link rel="stylesheet" href="../css/smoothness/jquery-ui.css" type="text/css"/>
+  <link rel="stylesheet" href="../controls/slick.pager.css" type="text/css"/>
+  <link rel="stylesheet" href="examples.css" type="text/css"/>
+  <style>
+    .cell-title {
+      font-weight: bold;
+    }
+
+    .cell-effort-driven {
+      text-align: center;
+    }
+
+    .cell-selection {
+      border-right-color: silver;
+      border-right-style: solid;
+      background: #f5f5f5;
+      color: gray;
+      text-align: right;
+      font-size: 10px;
+    }
+  </style>
+</head>
+<body>
+<div style="position:relative">
+  <div style="width:600px;">
+    <div class="grid-header" style="width:100%">
+      <label>SlickGrid</label>
+    </div>
+    <div id="myGrid" style="width:100%;height:500px;"></div>
+    <div id="pager" style="width:100%;height:20px;"></div>
+  </div>
+
+  <div class="options-panel">
+    <b>Description:</b>
+    <hr/>
+
+    <p>
+      This page demonstrates how the bulk update operations can be used efficiently
+      delete and insert new rows into the table. The example simulates a log viewer
+      where for each log severity always 100 items are shown in a ring-buffer fashion.
+      If you use the browser profiler to compare the two different operations below 
+      you will notice the significant performance difference which can be crucial for 
+      systems where a lot of new events are provided from an external source and 
+      then updated.
+    </p>
+    <h2>Controls</h2>
+    <button onclick="simulateLogs(100000, false, true)">Add 100000 entries of each severity (inefficient)</button>
+    <button onclick="simulateLogs(100000, true, true)">Add 100000 entries of each severity (efficient)</button>
+    <div>
+        Last update took: <span id="duration"></span>
+    </div>
+    <h2>View Source:</h2>
+    <ul>
+      <li><a href="https://github.com/6pac/SlickGrid/blob/master/examples/example-optimizing-updates.html" target="_sourcewindow"> View the source for this example on Github</a></li>
+    </ul>
+  </div>
+</div>
+
+<script src="../lib/jquery-1.12.4.min.js"></script>
+<script src="../lib/jquery-ui.min.js"></script>
+<script src="../lib/jquery.event.drag-2.3.0.js"></script>
+
+<script src="../slick.core.js"></script>
+<script src="../slick.formatters.js"></script>
+<script src="../slick.grid.js"></script>
+<script src="../slick.dataview.js"></script>
+<script src="../controls/slick.pager.js"></script>
+
+<script>
+  var dataView;
+  var grid;
+  var data = [];
+  var columns = [
+    {id: "sel", name: "#", field: "num", behavior: "select", cssClass: "cell-selection", width: 40, resizable: false, selectable: false },
+    {id: "severity", name: "Severity", field: "severity", width: 120, minWidth: 120, cssClass: "cell-severity"},
+    {id: "time", name: "Time", field: "time", width: 120, minWidth: 120, cssClass: "cell-time"},
+    {id: "message", name: "Message", field: "message", minWidth: 300, cssClass: "cell-message"},
+  ];
+
+  var options = {
+    editable: false,
+    enableAddRow: false,
+    enableCellNavigation: true
+  };
+
+  var eventIndex = 0;
+  var severities = ['Info', 'Warning', 'Error'];
+  var maxItemsPerSeverity = 100;
+
+  function LogEntry() {
+    eventIndex++;
+    this.id = "id_" + eventIndex;
+    this.severity = severities[eventIndex % severities.length];
+    this.time = new Date().toISOString().substring(0,19);
+    this.message = "Log Entry " + eventIndex;
+  }
+
+  // our ringbuffer to keep only 10 items per severity
+  var logsPerSeverity = {}; 
+  for (var i = 0; i < severities.length; i++) {
+    logsPerSeverity[severities[i]] = [];
+  }  
+
+  // the logic to simulate new events
+
+  function simulateLogs(count, efficient, update) {
+    var chunks = 10;
+    var start = new Date();
+    for(var i = 0; i < chunks; i++) {
+        simulateLogChunk(count / chunks, efficient);
+    }
+    var end = new Date();
+    if (update) {
+        $('#duration').text(end - start + 'ms');
+    }      
+  }
+  function simulateLogChunk(count, efficient, update) {
+    if(efficient) {
+      dataView.beginUpdate(true); // efficient bulk update 
+      var logs = []; // we will first collect all items to be added
+      for (var i = 0; i < count; i++) {
+        var log = new LogEntry();
+        var group = logsPerSeverity[log.severity];
+        if(group.length > maxItemsPerSeverity) {
+          dataView.deleteItem(group.pop().id);
+        }
+
+        group.unshift(log);
+        logs[i] = log;
+      }
+      // then we insert all items in one go.
+      dataView.insertItems(0, logs);    
+      dataView.endUpdate();          
+    } else {
+      dataView.beginUpdate(); // just a normal update 
+      for (var i = 0; i < count; i++) {
+        var log = new LogEntry();
+        var group = logsPerSeverity[log.severity];
+        if(group.length > maxItemsPerSeverity) {
+          try {
+            dataView.deleteItem(group.pop().id);
+          } catch(e) {
+            // item not yet fully inserted
+          }
+        }
+
+        group.unshift(log);
+        dataView.insertItem(0, log); // individual inserts
+      }
+      dataView.endUpdate();  
+    }
+  }
+
+  $(function () {
+    dataView = new Slick.Data.DataView({ inlineFilters: true });
+    grid = new Slick.Grid("#myGrid", dataView, columns, options);
+    var pager = new Slick.Controls.Pager(dataView, grid, $("#pager"));
+
+    // wire up model events to drive the grid
+    dataView.onRowCountChanged.subscribe(function (e, args) {
+      grid.updateRowCount();
+      grid.render();
+    });
+
+    dataView.onRowsChanged.subscribe(function (e, args) {
+      grid.invalidateRows(args.rows);
+      grid.render();
+    });
+
+    // prepare some data
+    simulateLogs(severities.length * maxItemsPerSeverity, true)
+  })
+</script>
+</body>
+</html>
diff --git a/examples/index.html b/examples/index.html
@@ -60,6 +60,7 @@ <h2>Data-Centric</h2>
       <li><a href="example-totals-via-data-provider.html">Implementing a totals row via a data provider</a></li>
       <li>(most comprehensive) <a href="example4-model.html">Using a filtered data view to drive the grid</a></li>
       <li><a href="example-optimizing-dataview.html">Optimizing DataView for 500’000 rows</a></li>
+      <li><a href="example-optimizing-updates.html">Optimizing DataView for updates</a></li>
       <li><a href="example6-ajax-loading.html">AJAX-loading data with search</a></li>
       <li><a href="example6-ajax-loading-yahoo.html">AJAX-loading data, second example</a></li>
       <li><a href="example13-getItem-sorting.html">Sorting by an index, getItem method</a></li>

diff --git a/slick.compositeeditor.js b/slick.compositeeditor.js
@@ -1,11 +1,4 @@
 (function ($) {
-  $.extend(true, window, {
-    Slick: {
-      CompositeEditor: CompositeEditor
-    }
-  });
-
-
   /***
    * A composite SlickGrid editor factory.
    * Generates an editor that is composed of multiple editors for given columns.
@@ -260,4 +253,11 @@
     editor.prototype = this;
     return editor;
   }
+
+  // exports
+  $.extend(true, window, {
+    Slick: {
+      CompositeEditor: CompositeEditor
+    }
+  });  
 })(jQuery);