Download e-book for kindle: Ext JS 4 Web Application Development Cookbook by Andrew Duncan, Stuart Ashworth

By Andrew Duncan, Stuart Ashworth

ISBN-10: 1849516863

ISBN-13: 9781849516860

Over one hundred ten easy-to-follow recipes subsidized up with real-life examples, strolling you thru simple Ext JS positive factors to complex software layout utilizing Senchas Ext JS with this booklet and publication. the way to construct wealthy web functions with the most recent model of the Ext JS framework in a cookbook sort. From growing kinds to theming your interface, you are going to study the construction blocks for constructing the appropriate internet software. effortless to keep on with recipes step via useful and distinct examples that are all absolutely subsidized up with code, illustrations, and suggestions.

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Class' Extend preprocessor (which we talked about in the previous recipe) what class your new one should be inherited from. The preprocessor then merges all of the parent class' members into the new class' definition, giving us our extended class. By extending the Vehicle class in this way our class diagram will look like the one shown as follows. Plane 17 Classes, Object-Oriented Principles and Structuring your Application The callParent method is a very quick way of executing the parent class' version of the method.

Log(this); } var myClass = new MyClass(); 5. If we add a property to the this object in our constructor, we can alert it once a new instance has been created. myProperty); // alerts 'undefined' Scope and Ext JS When dealing with scope in Ext JS we are generally concerned with making sure our functions are executing in the scope of the correct class (whether it is a component, store, or controller). Button instance). It's likely that we want the button's handler to execute in the scope of the parent class (for example, a grid panel) and so we must force a different scope upon it.

Query('textfield:last'); It is very simple for us to create our own custom pseudo-selectors; we will demonstrate how to add a pseudo-selector to retrieve components that are visible. pseudos object called visible, which accepts one parameter that will contain the array of matches found so far. We will then add code to loop through each item, checking if it's visible and, if it is, adding it to a new filtered array. We then return this new filtered array. push(items[i]); } } return result; }; We can now use this in a selector in the same way as we did before.

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Ext JS 4 Web Application Development Cookbook by Andrew Duncan, Stuart Ashworth

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