asp.net - HTML helper DropDownList explained -

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can please explain how works? (which overload being used)

@html.dropdownlist("financialyearid", "select fy")

financialyearid selectlist in view bag. why passed string?

also how can add custom attributes on input element? adding 3rd parameter 

new { @class = "foo" }

doesn't work?

is possible add data- attributes using default helpers?

thanks

you're calling this overload. creates dropdown list name "financialyearid" (which means selected value bind model or viewbag property called "financialyearid") , "select fy" placeholder (empty) selection text.

if want add class, need dropdown(string, ienumerable, string, object) helper:

@html.dropdownlist("financialyearid", null, "select fy", new { @class = "foo" })

here, can populate dropdownlist passing in ienumerable (such selectlist) have passed null.

yes, entirely possible pass data attribute. replace hyphen underscore:

@html.dropdownlistfor("financialyearid", null,                    "select fy", new { @data_something = "foo" })

if have model property you're trying bind selected value, can pass lamba expression indicate property want bind , framework generate appropriate name:

@html.dropdownlist(m => m.financialyearid, myselectlist,                    "select fy", new { @data_something = "foo" })

i'd advise putting selectlist in model on initial request rather using viewbag.


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