In the previous chapter we have created the index file, our application JavaScript file, the model for the Tree representation and the Tree Store that will get the data from Java Servlet in JSON format using AJAX request and keep them saved. Lets move forward with our application.
Tree panel that will display the Whole world dividing them into continents and various regions - CountryTree.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 | Ext.define('MYTREE.view.CountryTree', { extend: 'Ext.tree.Panel', alias: 'widget.countryTree', store: 'Countries', title: 'The whole world in a Tree Panel with Column Headers', height: 400, width: 800, padding: '5 5 5 5', useArrows: true, multiSelect: true, singleExpand: true, rootVisible: false, dockedItems: [{ dock: 'bottom', items: [{ xtype : 'button', text: 'Get all checked nodes', action: 'getCheckedNodes' } ] }], columns: [ { //treecolumn xtype tells the Grid which column will show the tree xtype: 'treecolumn', text: 'Continents -> Regions -> Countries', flex: 2, sortable: true, dataIndex: 'text' }, { text: 'Population', flex: 1, sortable: true, dataIndex: 'population', align: 'right' }, { text: 'Surface Area', flex: 1, sortable: true, dataIndex: 'surfaceArea', align: 'right', }, { text: 'Life Expectancy', flex: 1, sortable: true, dataIndex: 'lifeExpectancy', align: 'right' }, { text: 'GNP', flex: 1, sortable: true, dataIndex: 'gnp', align: 'right', }, { //templatecolumn helps us provide a custom template using tpl property xtype: 'templatecolumn', text: 'Capital', flex: 1, sortable: true, dataIndex: 'capital', tpl: ' {capital}' } ]}); |
Next we create the menus so that we can add, edit and delete a country - AddMenu.js and EditMenu.js
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 | Ext.define('MYTREE.view.AddMenu', { extend: 'Ext.menu.Menu', alias: 'widget.addMenu', width: 120, initComponent: function() { var me = this; Ext.applyIf(me, { items: [ { xtype: 'menuitem', text: 'Add', iconCls: 'icon-add' } ] }); me.callParent(arguments); }});Ext.define('MYTREE.view.EditMenu', { extend: 'Ext.menu.Menu', alias: 'widget.editMenu', width: 120, initComponent: function() { var me = this; Ext.applyIf(me, { items: [ { xtype: 'menuitem', text: 'Edit', iconCls: 'icon-edit' }, { xtype: 'menuitem', text: 'Delete', iconCls: 'icon-delete', } ] }); me.callParent(arguments); }}); |
Now we need a Window that will display the country information when we click on the edit menu option so that we can make changes - CountryEdit.js
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 | Ext.define('MYTREE.view.CountryEdit', { extend: 'Ext.window.Window', alias : 'widget.countryEdit', addMode : false, title : 'Country Information', layout: 'fit', //autoShow: true, initComponent: function() { this.items = this.buildItems(); this.buttons = this.buildButtons(); this.callParent(arguments); }, buildItems: function(){ return [ { xtype: 'form', items: [ { xtype: 'textfield', itemId : 'code', name : 'code', allowBlank: false, msgTarget: 'side', fieldLabel: 'Country Code', size: 5, maxLength: 5 }, { xtype: 'textfield', name : 'text', allowBlank: false, msgTarget: 'side', fieldLabel: 'Country Name', size: 31, maxLength: 30 }, { xtype: 'textfield', name : 'capital', allowBlank: false, msgTarget: 'side', fieldLabel: 'Capital', size: 31, maxLength: 30 }, { xtype: 'numberfield', name : 'population', value: 0, minValue: 0, fieldLabel: 'Population', decimalPrecision:0, step: 1.00 }, { xtype: 'numberfield', name : 'surfaceArea', value: 0, minValue: 0, fieldLabel: 'Surface Area', decimalPrecision:2, step: 0.01 }, { xtype: 'numberfield', name : 'lifeExpectancy', value: 0, minValue: 0, fieldLabel: 'Life Expectancy', decimalPrecision:2, step: 0.01, itemId : 'lifeExpectancy' }, { xtype: 'numberfield', name : 'gnp', value: 0, minValue: 0, fieldLabel: 'GNP', decimalPrecision:2, step: 0.01, itemId : 'gnp' }, { xtype: 'hiddenfield', name : 'parentNodeId', itemId : 'parentNodeId' } ] } ]; }, buildButtons: function(){ return [ { text: 'Save', action: 'save' }, { text: 'Cancel', scope: this, handler: this.close }]; } }); |
Now that we have created all our components its time to create the controller that will bind all these together and provide the functionality we need from this Tree panel - Countries.js
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 | Ext.define('MYTREE.controller.Countries', { extend : 'Ext.app.Controller', //define the stores stores : ['Countries'], //define the models models : ['Country'], //define the views views : ['CountryTree', 'EditMenu', 'AddMenu', 'CountryEdit'], refs : [{ //reference to the country Tree ref : 'myCountryTree', selector : 'countryTree' }, { //reference to the country window ref : 'myCountryWindow', selector : 'countryEdit' }], init : function() { this.control({ 'viewport' : { render : this.onPanelRendered }, //Tree events - click, checkbox change, node expand and right click 'countryTree' : { itemclick : this.treeItemClick, checkchange : this.treeCheckChange, itemexpand : this.treeNodeExpand, itemcontextmenu : this.treeRightClick }, //get all checked noded button 'countryTree button[action=getCheckedNodes]' : { click : this.getAllCheckedNodes }, //edit a country 'editMenu menuitem[text=Edit]' : { click : this.editCountry }, //delete a country 'editMenu menuitem[text=Delete]' : { click : this.deleteCountry }, //add a country 'addMenu menuitem[text=Add]' : { click : this.addCountry }, //save country info from the edit window 'countryEdit button[action=save]' : { click : this.saveCountry } }); }, onPanelRendered : function() { //just a console log to show when the panel is rendered console.log('The panel was rendered'); }, treeItemClick : function(view, record) { //some node in the tree was clicked //you have now access to the node record and the tree view console.log('Clicked on a Tree Node!\n' + 'Node id: ' + record.get('id') + '\n' + 'Node Text: ' + record.get('text') + '\n' + 'Parent Node id: ' + record.get('parentId') + '\n' + 'Is it a leaf?: ' + record.get('leaf') + '\n' + 'No of Children: ' + record.childNodes.length); //now you have all the information about the node //Node id //Node Text //Parent Node //Is the node a leaf? //No of child nodes //...................... //go do some real world processing }, //event triggred when a node is checked or unchecked treeCheckChange : function(node, checked) { console.log('Checkbox clicked: Is it checked? ' + checked); console.log('Is the node loaded? ' + node.isLoaded()); //loops thru all child nodes and check or uncheck //based on the parent node that was clicked node.eachChild(function(childNode) { childNode.set('checked', checked); //keep going this.treeCheckChange(childNode, checked); }, this); }, //node expand event treeNodeExpand : function(node) { console.log('Expanded Node: How many children? ' + node.childNodes.length); }, //get all nodes that are checked in the Tree panel getAllCheckedNodes : function(button) { selectedNodes = this.getMyCountryTree().getChecked(); console.log('List of Selected Nodes:\n'); Ext.Array.each(selectedNodes, function(record) { console.log('Node:' + record.get('id') + ' Text:' + record.get('text') + '\n'); }); }, //display the context menu treeRightClick : function(view, record, item, index, e) { //stop the default action e.stopEvent(); //save the current selected record this.application.currentRecord = record; //if the node is a region let user add a country if (record.get('depth') === 2) { addMenu = Ext.widget('addMenu'); addMenu.showAt(e.getXY()); } //if the node is country let the user edit or delete if (record.get('depth') === 3) { editMenu = Ext.widget('editMenu'); editMenu.showAt(e.getXY()); } return false; }, //edit the country editCountry : function(item, e) { console.log(this.application.currentRecord); //get reference to the window for editing countryWindow = this.getMyCountryWindow(); //create the window for editing if it doesn't exist if(!countryWindow){ countryWindow = Ext.widget('countryEdit'); } //load the record into the form countryWindow.down('form').loadRecord(this.application.currentRecord); //get the Country code field in the form and protect it countryWindow.down('form').getComponent('code').setReadOnly(true); //set the parent node id in the hidden field countryWindow.down('form').getComponent('parentNodeId') .setValue(this.application.currentRecord.parentNode.get('id')); //display the window countryWindow.show(); }, addCountry : function(item, e) { console.log(this.application.currentRecord); //get reference to the window for editing countryWindow = this.getMyCountryWindow(); //create the window for editing if it doesn't exist if(!countryWindow){ countryWindow = Ext.widget('countryEdit'); } //set to Add mode countryWindow.addMode = true; //load blank record into the form blankCountry = new MYTREE.model.Country(); countryWindow.down('form').loadRecord(blankCountry); //get the Country code field in the form and unprotect it countryWindow.down('form').getComponent('code').setReadOnly(false); //set the current node as parent node id in the hidden field countryWindow.down('form').getComponent('parentNodeId') .setValue(this.application.currentRecord.get('id')); countryWindow.down('form').getComponent('lifeExpectancy').setValue(0); countryWindow.down('form').getComponent('gnp').setValue(0); //display the window countryWindow.show(); }, //delete a country deleteCountry : function(item, e) { console.log(this.application.currentRecord); //set action as delete type = 'delete'; //node is the parent node id node = this.application.currentRecord.parentNode.get('id'); //data is the current node id data = this.application.currentRecord.get('id'); //send the request to the server this.sendMyRequest(type, node, data); }, //save the country information from the editing window saveCountry : function(button) { //get access to the window using the button reference var win = button.up('window'); //get access to the form using the window reference form = win.down('form'); //check if the form passed all validations if (form.getForm().isValid()) { //if there are no errors then send the Add request to server countryWindow = this.getMyCountryWindow(); //set the action based on window mode if(countryWindow.addMode){ type = 'add'; } else{ type = 'edit'; } //get parent node from the hidden field node = form.getComponent('parentNodeId').getValue(); //encode the form values to a JSON object data = Ext.encode(form.getValues()); //send the request to server this.sendMyRequest(type, node, data); //close the window win.close(); } }, //sending the add, edit and delete transactions to server sendMyRequest: function(type, node, data){ //create an AJAX request Ext.Ajax.request({ url : 'CountryServlet', params : { action: type, parentNodeId: node, myData: data }, scope : this, //method to call when the request is successful success : this.onSaveSuccess, //method to call when the request is a failure failure : this.onSaveFailure }); }, onSaveFailure : function(err) { //Alert the user about communication error Ext.MessageBox.alert('Status', 'Error occured during Item Add'); }, onSaveSuccess : function(response, opts) { //Alert the user about communication error if(opts.params.action === 'edit'){ Ext.MessageBox.alert('Status', 'Country Updated!'); } if(opts.params.action === 'add'){ Ext.MessageBox.alert('Status', 'Country Added!'); } if(opts.params.action === 'delete'){ Ext.MessageBox.alert('Status', 'Country Deleted!'); } //get refernce to the node that needs to be reloaded to match data with the server refreshNode = this.getCountriesStore().getNodeById(opts.params.parentNodeId); //unnecessary but required here due to an ExtJS bug refreshNode.removeAll(false); //refresh(reload) the node this.getCountriesStore().load({ node : refreshNode }); } }); |
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