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show / hide icons by default. It uses :first-child, but

Huzzah. I set default content for all my columns to null and no errors, but now I have an empty row sitting at the top of my page :(

You could override the default class name, or remove

can I show a Default error message: 'Please enter

need to remove DataTables default event listeners and bind

You need to set a value for order as well. The default is to order on the first column. columns.orderable effects the end user's ability to order the data, not the API's, hence the need for that. Allan

printing function bypassing the default one then how can

Solved 1 for now: dt.on('column-visibility', function (e, settings, column, state) { if (dt.columns(':visible').count() === 1) { dt.column(column).visible(true); } }); Unfortunately the event doesn't support preventing the default, so it's kinda hacky, but it's the best I've got atm.

action method overide the default one i just save

Does your Editor instance already exist (I'm guessing it does)? If so, just use field().def() to set the default value for that field. Allan