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use .. set
task.set('EndDate', '2014/08/30')

putting values on the raw data will not trigger a change in the store..
I guess you want to set a new size on the locked grid?
gantt.lockedGrid.setWidth(newsize);
For splitter related questions please address the ExtJs forum. https://www.sencha.com/forum/
autoSync is a property of the store config. So add it there. https://docs.sencha.com/extjs/4.2.2/#!/api/Ext.data.AbstractStore-cfg-autoSync If you are not using autosync you could add a listener on the datachanged event https://docs.sencha.com/extjs/4.2.2/#!/api/Ext.data.AbstractStore-event-datachan...
You have configured a proxy on the store, use the sync method or set the autoSync property of the store to true.
It depends how you have configured your backend. But there are multiple ways. For example sync your store or call save on the model - if you have configured a proxy. https://docs.sencha.com/extjs/4.2.2/#!/api/Ext.data.Model-method-save https://docs.sencha.com/extjs/4.2.2/#!/api/Ext.data.AbstractStor...
You can do that by css and by modifying the innerTpl of the parentTask in case you want to add a textual display. See https://www.bryntum.com/products/gantt-for-extjs/docs/#!/api/Gnt.panel.Gantt-cfg-parentTaskBodyTemplate https://www.bryntum.com/products/gantt-for-extjs/docs/#!/api/Gnt.template.Pare...
I must be able to run it..... else I cannot detect any errors. I am sorry..
Hello John, We only give support on the javascript part. In your posted rar file I can not find any js file. Can you make a small working example which we can run? Data you can put in json dummy files. For returning success or false on CRUD operations you can look at the ExtJs/Sencha documentation. ...
Something likes this should work...
 {
        waitFor     : function () { 
              //get a reference to the element  
              return !el.isMasked() 
         }
 }
clsName should be the name of your class including namespaces.

like 'clsName: MyApp.columns.MyColumn'

text is the display value in the list.