Databases
StackOverflow2013
Postsdbo
POBetter way to call superclass method in ExtJS
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POBetter way to call superclass method in ExtJS
    primarykey
    data
    text
    <p>All the ExtJS documentation and examples I have read suggest calling superclass methods like this:</p> <pre><code>MyApp.MyPanel = Ext.extend(Ext.Panel, { initComponent: function() { // do something MyPanel specific here... MyApp.MyPanel.superclass.initComponent.call(this); } }); </code></pre> <p>I have been using this pattern for quite some time and the main problem is, that when you rename your class then you also have to change all the calls to superclass methods. That's quite inconvenient, often I will forget and then I have to track down strange errors.</p> <p>But reading the source of <code>Ext.extend()</code> I discovered, that instead I could use the <code>superclass()</code> or <code>super()</code> methods that <code>Ext.extend()</code> adds to the prototype:</p> <pre><code>MyApp.MyPanel = Ext.extend(Ext.Panel, { initComponent: function() { // do something MyPanel specific here... this.superclass().initComponent.call(this); } }); </code></pre> <p>In this code renaming MyPanel to something else is simple - I just have to change the one line.</p> <p>But I have doubts...</p> <ul> <li><p>I haven't seen this documented anywhere and the old wisdom says, I shouldn't rely on undocumented behaviour.</p></li> <li><p>I didn't found a single use of these <code>superclass()</code> and <code>supr()</code> methods in ExtJS source code. Why create them when you aren't going to use them?</p></li> <li><p>Maybe these methods were used in some older version of ExtJS but are deprecated now? But it seems such a useful feature, why would you deprecate it?</p></li> </ul> <p>So, should I use these methods or not?</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USblong
    1. USRene Saarsoo
    plurals
    1. This table or related slice is empty.
    1. PL
      singulars
      1. LTLinked
    2. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POBetter way to call superclass method in ExtJS
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POBetter way to call superclass method in ExtJS
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. POBetter way to call superclass method in ExtJS
      1. USGeorge Jempty
      1. VTFavorite
    1. COActually, could you try `this.constructor.superclass.initComponent.call(this);` ?
      singulars
      1. POBetter way to call superclass method in ExtJS
      1. USneonski
    2. COThanks, but this has the same problem that Jabe described - it works for only one level of hierarchy.
      singulars
      1. POBetter way to call superclass method in ExtJS
      1. USRene Saarsoo
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload