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Editorial Team
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Asked: 2026-05-13T14:50:23+00:00

For some reason an HTML helper is outputting this HTML which doesn’t validate. The

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For some reason an HTML helper is outputting this HTML which doesn’t validate.

The validator tells me:

There is no attribute "Length"

<%= Html.CheckBox("Medicamentos", Model.Medicamentos) %>

is outputting

<input type="checkbox" value="true" name="Medicamentos" id="Medicamentos" checked="checked" length="4">
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1 Answer

  1. Editorial Team

    I assume that it’s matching the signature that takes a string and an object since I don’t know what Model.Medicamentos is. In that case it takes the properties of the object and turns them into attributes on the element. I suspect that you simply want to use the Checked attribute on the Model property specified as the default value of the checkbox, i.e.,

    <%= Html.CheckBox( "Medicamentos", Model.Medicamentos.Checked ) %>

    In, which case, assuming that Checked is boolean it will match the correct method signature on the helper extension.

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