javascript - Only show columns that are filled from external JSON in ExtJS 3.x -


i parsing external json source in extjs , want display data in extjs grid. works perfectly.

there maximum set of fields predicitable, in cases of fields empty/not in json. if field not filled @ all, should not hidden.

is there functionality hide dynamically in extjs 3.x?

my code far:

var store = new ext.data.jsonstore({     url     : '/data/all.json',     storeid : 'mainstore',     fields  : ['name', 'company', 'country'] }); store.load()   var columns = [];     var colmodel = new ext.grid.columnmodel([         {header: 'name', sortable: true, dataindex: 'name', filterable: true, hidden: false, filter: {type: 'string'}},         {header: 'company', sortable: true, dataindex: 'company', filterable: true, hidden: false, filter: {type: 'string'}},         {header: 'country', sortable: true, dataindex: 'country', filterable: true, hidden: false, filter: {type: 'string'}},      ]);

my json like:

this should display fields.

[ {"name": "jon doe", "company": "acme inc.", "country": "mexico"}, {"name" : "jane doe", "company" : "acme ltd", "country" : "usa"}]

this should show name , company.

[ {"name": "jon doe", "company": "acme inc."}, {"name" : "jane doe", "company" : "acme ltd"}]

this should again show fields.

[ {"name": "jon doe", "company": "acme inc."}, {"name" : "jane doe", "company" : "acme ltd", "country" : "usa"}]

help appreciated.

you can create function evaluates data , return boolean.

var showorhidecolumns = function(columnname) {     var records = store.getrange(),         hidden = false;      ext.each(records, function(itm, idx) {         if (!itm.get(columnname)) {             hidden = true;             break;         }     });      return hidden; };

and use above function in headers. may want check scope of method in code.

{ header: 'name', hidden: showorhidecolumns }

note: above code not tested.


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