Are Global variables supported in the EXT JS framework?

Question

Are Global variables supported in the EXT JS framework?

When working with Java and C++, it is common practice to store a variable globally so that its value can be accessed from anywhere within the project. For example, if I am working inside a class named Residence and saving an INT as the residenceNumber to a global variable called houseNumberGlobalVariable, then I can access this houseNumberGlobalVariable from any class in the project.

In Ext JS, however, there isn't a direct concept of a global variable like in Java or C++. So, if you need to set a value in one class and access it from another, what would be the equivalent approach in Ext JS?

javascript extjs extjs4 extjs4.1

Answer 1

Answer №1

Organize your global variables by creating a dedicated class for them.

Ext.define('MyApp.global.MyGlobals', {
    singleton: true,
    ....   
    phoneNumberGlobalVar: undefined

});

This method enables easy access to the variable in any part of the code with

MyApp.global.MyGlobals.phoneNumberGlobalVar

Answer 2

Organize your global variables by creating a dedicated class for them.

Ext.define('MyApp.global.MyGlobals', {
    singleton: true,
    ....   
    phoneNumberGlobalVar: undefined

});

This method enables easy access to the variable in any part of the code with

MyApp.global.MyGlobals.phoneNumberGlobalVar

Answer 3

Answer №2

To create a global variable in app.js, simply declare a variable.

var globalVar;

You have the freedom to assign any value to this variable, such as:

globalVar.myStore = yourStore;

Answer 4

To create a global variable in app.js, simply declare a variable.

var globalVar;

You have the freedom to assign any value to this variable, such as:

globalVar.myStore = yourStore;

Answer 5

Answer №3

When considering your Application, you have the ability to define global variables.

Option 1: Define within the configuration

If you plan on using getter/setter methods (i.e. frequently changing the variable), it is recommended to use a configuration-based approach.

Defining Appconstants:

Ext.define('Practice.utilities.AppConstants', {
    alias: 'widget.AppConstants',
    config: {
        mainVarTest: 'mainVarTest',
    },
    testvar: 'Testing value',
    foo: 'bar',
    meh: 42,
    constructor: function(options) {
        this.initConfig(options);
    }
});

Accessing the variable:

var AppConstants = Ext.widget("AppConstants"); 
console.log(AppConstants.getMainVarTest());

Option 2: Define within a Singleton class

If your application requires a global variable that will not be altered within the app, consider using a Singleton class to load the constant variable only once. This approach is suitable when the variable does not need to be changed.

Defining:

Ext.define('Practice.utilities.AppConstants', {
    alias: 'widget.AppConstants',
    singleton: true,
    testvar: 'Testing value',
    foo: 'bar',
    meh: 42,
});

Accessing:

var AppConstant=Practice.utilities.AppConstants;
console.log(AppConstant.foo);

Option 3: Define as Statics

Statics refer to static variables (similar to Java). Using static variables ensures that the variable's lifetime extends for an indefinite period until explicitly cleared.

Ext.define("Practice.utilities.AppConstants", {
     statics: {
         mainVarTest: 'mainVarTest'
     },
 });

Answer 6

When considering your Application, you have the ability to define global variables.

Option 1: Define within the configuration

If you plan on using getter/setter methods (i.e. frequently changing the variable), it is recommended to use a configuration-based approach.

Defining Appconstants:

Ext.define('Practice.utilities.AppConstants', {
    alias: 'widget.AppConstants',
    config: {
        mainVarTest: 'mainVarTest',
    },
    testvar: 'Testing value',
    foo: 'bar',
    meh: 42,
    constructor: function(options) {
        this.initConfig(options);
    }
});

Accessing the variable:

var AppConstants = Ext.widget("AppConstants"); 
console.log(AppConstants.getMainVarTest());

Option 2: Define within a Singleton class

If your application requires a global variable that will not be altered within the app, consider using a Singleton class to load the constant variable only once. This approach is suitable when the variable does not need to be changed.

Defining:

Ext.define('Practice.utilities.AppConstants', {
    alias: 'widget.AppConstants',
    singleton: true,
    testvar: 'Testing value',
    foo: 'bar',
    meh: 42,
});

Accessing:

var AppConstant=Practice.utilities.AppConstants;
console.log(AppConstant.foo);

Option 3: Define as Statics

Statics refer to static variables (similar to Java). Using static variables ensures that the variable's lifetime extends for an indefinite period until explicitly cleared.

Ext.define("Practice.utilities.AppConstants", {
     statics: {
         mainVarTest: 'mainVarTest'
     },
 });

Answer 7

Answer №4

One thing that caught my attention was the absence of instructions on how to create a global variable using Sencha Architect program.

To start, navigate to the "Application" node in the project Inspector. Then, click on the Configs search/Filter box, which can be used for both searching and creating config entries. Initially, you will see a pre-filled text saying Filter Configs....

Type in your desired global variable name. If nothing shows up in the list below, it means the variable is not already created or the name is a reserved keyword. On the right side of the textbox, you'll find an "Add" button - click on it to add your global variable to the application.

Assuming you have added a variable named Foo, it should now be visible in the config list. Next to this entry, there is an ellipses button indicating that the new variable is currently defined as a String. Click on the button to change the type to something else, like 'Number'. Provide a value for the variable, and voila! Your global variable is all set.

Now, how do you make use of this newly created variable? Below is an example code snippet showing how to assign the global variable to a local one:

var bar = MyApp.app.Foo;

The reference 'MyApp' corresponds to the Application's name setting within the configuration of the application you're working on. You can locate this same value in the config settings of the Application node by filtering on name.

Answer 8

One thing that caught my attention was the absence of instructions on how to create a global variable using Sencha Architect program.

To start, navigate to the "Application" node in the project Inspector. Then, click on the Configs search/Filter box, which can be used for both searching and creating config entries. Initially, you will see a pre-filled text saying Filter Configs....

Type in your desired global variable name. If nothing shows up in the list below, it means the variable is not already created or the name is a reserved keyword. On the right side of the textbox, you'll find an "Add" button - click on it to add your global variable to the application.

Assuming you have added a variable named Foo, it should now be visible in the config list. Next to this entry, there is an ellipses button indicating that the new variable is currently defined as a String. Click on the button to change the type to something else, like 'Number'. Provide a value for the variable, and voila! Your global variable is all set.

Now, how do you make use of this newly created variable? Below is an example code snippet showing how to assign the global variable to a local one:

var bar = MyApp.app.Foo;

The reference 'MyApp' corresponds to the Application's name setting within the configuration of the application you're working on. You can locate this same value in the config settings of the Application node by filtering on name.

Answer 9

Answer №5

Include the code snippet "var globalVar = {};" in your app.js file and it should function correctly.

Answer 10

Include the code snippet "var globalVar = {};" in your app.js file and it should function correctly.

Are Global variables supported in the EXT JS framework?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

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