I'm feeling a bit lost trying to figure out which method to use when using grep object - should I go with up(), down(), or Ext.getCmp(ID)?
Personally, I find it simpler to assign an ID to the object and then retrieve it using Ext.getCmp('ID') as it makes the code appear cleaner.
Let's consider this example:
console.log(this.up('panel').up('panel').down('grid'));
console.log(Ext.getCmp('myPanel'));
Which approach would offer better performance?
One must be cautious when using IDs and getCmp to locate components in your code. The main issue arises from the possibility of reusing components unsafely due to the creation of duplicate IDs in the HTML markup, violating HTML standards. This can lead to unexpected behavior in cases where multiple components share the same ID, making it challenging to troubleshoot as the framework may not reference the correct components.
Various blog posts, forum discussions, and a video by J. Garcia delve into this topic. It is recommended to reserve the use of getCmp for debugging purposes only and opt for alternative methods such as up, down, refs, itemId, and ComponentQuery) for writing stable production-ready code.
Ext.getCmp() utilizes a hash map internally, allowing for lightning-fast retrieval similar to accessing values in an array by key.
.up() and down() rely on traversing the component hierarchy, resulting in a slower process.
However, up() and down() support selectors, enabling the selection of classes as well as ids.
In various scenarios, you may find it beneficial to use up() or down(), such as when dealing with a common handler for multiple controls, or when targeting a component generated automatically by the framework without manually assigning an id.
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