grid programme

node_modules/flickity/test/unit/add-remove-cells.js

@@ -0,0 +1,88 @@
+QUnit.test( 'add/remove cells', function( assert ) {
+  'use strict';
+
+  function makeCellElem() {
+    var cellElem = document.createElement('div');
+    cellElem.className = 'cell';
+    return cellElem;
+  }
+
+  // position values can be off by 0.1% or 1px
+  function isPositionApprox( value, expected ) {
+    var isPercent = value.indexOf('%') != -1;
+    value = parseFloat( value );
+    var diff = Math.abs( expected - value );
+    return isPercent ? diff < 0.1 : diff <= 1;
+  }
+
+  var elem = document.querySelector('#add-remove-cells');
+  var flkty = new Flickity( elem );
+  var sliderElem = elem.querySelector('.flickity-slider');
+
+  function checkCellElem( cellElem, index, message ) {
+    assert.equal( sliderElem.children[ index ], cellElem, message + ' cell element in DOM correct' );
+    assert.equal( flkty.cells[ index ].element, cellElem, message + ' element added as cell' );
+    assert.ok( isPositionApprox( cellElem.style.left, index * 25 ), ' element positioned' );
+  }
+
+  // prepend cell element
+  var cellElem = makeCellElem();
+  flkty.prepend( cellElem );
+  checkCellElem( cellElem, 0, 'prepended' );
+  assert.equal( flkty.selectedIndex, 1, 'selectedIndex +1 after prepend' );
+  // append cell element
+  cellElem = makeCellElem();
+  flkty.append( cellElem );
+  var lastIndex = flkty.cells.length - 1;
+  checkCellElem( cellElem, lastIndex, 'appended' );
+  assert.equal( flkty.selectedIndex, 1, 'selectedIndex same after prepend' );
+  // insert single cell element
+  cellElem = makeCellElem(); // this one gets removed first
+  flkty.select( 2 );
+  flkty.insert( cellElem, 2 );
+  checkCellElem( cellElem, 2, 'single inserted' );
+  assert.equal( flkty.selectedIndex, 3, 'selectedIndex +1 after insert before' );
+  flkty.insert( makeCellElem(), 4 );
+  assert.equal( flkty.selectedIndex, 3, 'selectedIndex same after insert before' );
+  // insert multiple cell elements
+  var cellElems = [ makeCellElem(), makeCellElem(), makeCellElem() ];
+  flkty.insert( cellElems, 3 );
+  checkCellElem( cellElems[0], 3, 'first multiple inserted' );
+  checkCellElem( cellElems[1], 4, 'second multiple inserted' );
+  checkCellElem( cellElems[2], 5, 'third multiple inserted' );
+  assert.equal( flkty.selectedIndex, 6, 'selectedIndex +6 after 3 insert before' );
+
+  function checkCellPositions() {
+    var isGap = false;
+    for ( var i=0, len = flkty.cells.length; i < len; i++ ) {
+      var cell = flkty.cells[i];
+      if ( !isPositionApprox( cell.element.style.left, i * 25 ) ) {
+        assert.ok( false, 'gap in cell position ' + i + ' after removal' );
+        isGap = true;
+      }
+    }
+    assert.ok( !isGap, 'no gaps in cell positions' );
+  }
+
+  // remove single cell element that was inserted
+  var len = flkty.cells.length;
+  flkty.remove( cellElem );
+  assert.equal( len - sliderElem.children.length, 1, 'element removed from DOM' );
+  assert.equal( len - flkty.cells.length, 1, 'cell removed' );
+  assert.equal( flkty.selectedIndex, 5, 'selectedIndex -1 after remove before' );
+  checkCellPositions();
+  // remove multiple
+  len = flkty.cells.length;
+  flkty.select( 4 );
+  flkty.remove([ cellElems[2], cellElems[0], cellElems[1] ]);
+  assert.equal( len - sliderElem.children.length, 3, 'elements removed from DOM' );
+  assert.equal( len - flkty.cells.length, 3, 'cells removed' );
+  checkCellPositions();
+
+  // remove all cells
+  flkty.remove( flkty.getCellElements() );
+  assert.equal( flkty.cells.length, 0, 'all cells removed' );
+  flkty.resize();
+  assert.ok( true, 'resize with zero items didnt freak out' );
+
+});