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    <p>I have done some work on your problem but by adding custom validation in "PlayListApp.controller.Plays". Now the length of the 'narrative' field will not exceed 3 digits. Also user can't enter negative number.</p> <p>You have to make changes in two files :-</p> <p>1) "PlayListApp.model.Play"<br> 2) "PlayListApp.controller.Plays"</p> <pre><code> // "PlayListApp.model.Play" Ext.define("PlayListApp.model.Play", { extend: "Ext.data.Model", config: { idProperty: 'id', fields: [ { name: 'title', type: 'string' }, { name: 'narrative', type: 'int'} ], validations: [ { type: 'presence', field: 'title', message: 'Please enter a link in playlist.' },//This validation only works { type: 'presence', field: 'narrative', message: 'Please enter duration in playlist'}, { type: 'presence', field: 'narrative', message: 'Enter a number for this note.' } ] } }); </code></pre> <p>Here is the controller.js - "PlayListApp.controller.Plays"</p> <pre><code>Ext.define("PlayListApp.controller.Plays", { extend: "Ext.app.Controller", config: { refs: { // We're going to lookup our views by xtype. notesListView: "playslistview", noteEditorView: "playeditorview", notesList: "#notesList" }, control: { notesListView: { // The commands fired by the notes list container. newNoteCommand: "onNewNoteCommand", editNoteCommand: "onEditNoteCommand" }, noteEditorView: { // The commands fired by the note editor. saveNoteCommand: "onSaveNoteCommand", deleteNoteCommand: "onDeleteNoteCommand", backToHomeCommand: "onBackToHomeCommand" } } }, onSaveNoteCommand: function () { //console.log("onSaveNoteCommand"); var noteEditor = this.getNoteEditorView(); var currentNote = noteEditor.getRecord(); var newValues = noteEditor.getValues(); currentNote.set("title",newValues.title); currentNote.set("narrative", newValues.narrative); var errors = currentNote.validate(); if (!errors.isValid()) { //Ext.Msg.alert('', errors.getByField("title")[0].getMessage(), Ext.emptyFn); errors.each(function (err) { msg += err.getMessage() + '&lt;br&gt;'; }); // each() Ext.Msg.alert('ERROR!', msg); currentNote.reject(); return; } // checking for negative number if(newValues.narrative&lt;="0") { Ext.Msg.alert('','Choose number greater than 0'); currentNote.reject(); return; } // checking for value greater than 3-digit number if(newValues.narrative&gt;"999") { Ext.Msg.alert('','Length should not be greater than THREE'); currentNote.reject(); return; } var notesStore = Ext.getStore("Notes"); //notesStore.sync(); //notesStore.sort([{ property: 'dateCreated', direction: 'DESC'}]); this.activateNotesList(); }, </code></pre> <p>Hope this helps you.<br> If this is not what you wanted , explain your requirement once again.<br> Bye.</p>
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