Manually set unobtrusive validation error on a textbox

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First, you can add a validation summary:

@Html.ValidationMessageFor(m => m.Slug)

Then you can manually trigger jQuery validation / unobtrusive validation with the .showError method. Here is a sample:

var errorArray = {};
errorArray["Slug"] = 'Some error message for the Slug text box';
$('#SomeFormId').validate().showErrors(errorArray);

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