Upgrading an Ext JS 4.x Application to Ext JS 6.x

Mark D. LincolnSenior Solutions Engineer, Sencha

November 9, 2016

What Type of Upgrade Do We Want To Do

• Minimalist- Change the framework version

- Get the application running

- Resolve an issues that arise

• Migration- New application

- Migrate the functionality

- Use latest features and functionality wherever possible

How Do We Perform the Upgrade?

• Review the architecture

• Analyze the implementation

• Decompose the source code into logical parts

• Reassemble it into an upgraded application

Jigsaw Puzzle

Jigsaw Puzzle

• How do we assemble a jigsaw puzzle?- Layout the pieces

- Find the corners

- Assemble the edges

- Work toward the middle

Steps to Assemble the Puzzle

Laying Out the Pieces

• Original application requirements

• Implementation heritage- Original version of Ext JS used

- Subsequent versions of Ext JS used

- Existing legacy code

- Sencha MVC pattern

• State of the Ext JS 4.x application- Code quality

- Performance problems

- Memory leaks

7

Finding the Corners

• Create a new workspace with Sencha Cmd

• Create a new application within the workspace

• Review the Source Code for the Views- Identify the location of the functionality

• View

• Controller

• Sencha MVC to Sencha MVVM- Create view controllers

- Create view models

Assembling the Edges

• Decompose global controllers into view controllers- Business or functional controllers become view controllers with business logic

• Migrate event handling- Move selector based listeners to view based listeners

- Move event handling methods from the global controllers to the view controllers

Work Toward the Middle

• Move global data stores to view model stores collection- Localizes store to the view

- Matches store lifetime to the view lifetime

• Optimizations- Two-way data binding

- Using “reference” config and lookup()

• Replace “itemId” config

• Replace “up()”, “down()”, and “query()” in containers

- Move reusable code to packages

// Retrieve a reference to the profile model for the// current user.var userProfileModel = userProfiles.getAt( 0 );// Update the user profile form with the information// from the model.userProfileForm.down( '#UserNumber' ).setValue( userProfileModel.get( 'number' ) );userProfileForm.down( '#FirstName' ).setValue( userProfileModel.get( 'first' ) );userProfileForm.down( '#MiddleName' ).setValue( userProfileModel.get( 'middle' ) );userProfileForm.down( '#LastName' ).setValue( userProfileModel.get( 'last' ) );userProfileForm.down( '#MobileNumber' ).setValue( userProfileModel.get( 'mobile' ) );

Loading Form Data

• Data binding replaces this

• Code can be eliminated

// Retrieve a reference to the profile model for the// current user.var userProfileModel = userProfiles.getAt( 0 );

// Update the user profile with the information from// the form.userProfileModel.set( 'number', userProfile.number );userProfileModel.set( 'first', userProfile.first );userProfileModel.set( 'middle', userProfile.middle );userProfileModel.set( 'last', userProfile.last );userProfileModel.set( 'mobile', userProfile.mobile );

// Save the new user profile to local storage.userProfiles.sync();

Saving Form Data

• Data binding replaces this

• Code can be eliminated

items : [ { xtype : 'textfield', reference : 'UserNumber', anchor : '100%', fieldLabel : 'User #', labelAlign : 'left', labelWidth : 60, name : 'number', allowBlank : false, bind : { value : '{user.number}' } }, { xtype : 'textfield', reference : 'FirstName', anchor : '100%', fieldLabel : 'First', labelAlign : 'left', labelWidth : 60, name : 'first', allowBlank : false, bind : { value : '{user.first}' } }]

Two-Way Data Binding Form

• Replacement for boiler plate code- Reduces load and save functionality

- More efficient

- Easier to maintain

Sencha Fleet

Sencha Fleet

• Origin as a Sencha Services Hackathon Exercise- Mobile application implemented in Sencha Touch 2.x

• Added an application for dispatching deliveries- Desktop application implemented in Ext JS 4.x

• Good candidate for upgrade- Universal application application implemented in Ext JS 6.x

Sencha Services

• Code review, recommendations, and level of effort

• Get your team started in the right direction

• Provide support and periodic assistance

• Perform the entire upgrade

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