Preventing a specific HTML attribute from being included by Razor, or allowing it to be added selectively

When using Razor to add an input field, unwanted HTML attributes are included. The specific attribute causing the issue is value="0". It seems that Razor adds this attribute because the variable ccVersandkosten is a float, which cannot be changed. Is there a way to prevent Razor from adding this attribute or remove it manually?

@Html.TextBoxFor(x => x.ccVersandkosten, new { @class = "form-control" })

I'm including an input field using Razor code.

<input class="form-control" data-val="true" data-val-number="Das Feld&quot;Versandkosten&quot; muss eine Zahl sein." data-val-required="Das Feld &quot;Versandkosten&quot;" value="0" id="ccVersandkosten" name="ccVersandkosten" type="text" />

The unnecessary attribute in my case is value="0", but I need the variable to remain as a float type.

htmlcssasp.net-mvcrazor

Answer №1

When you set a variable as type float in your model, it cannot be null. Upon initialization of the model, non-nullable variables are automatically initialized to 0 by C#. This behavior is not specific to Razor, but rather a feature of C#.

Therefore, when rendered in Razor, the field will display as 0. If you want the field to show nothing for the value attribute, you can define the variable as nullable using float? ccVersandkosten.

The use of @model MyModel in Razor is equivalent to var model = new MyModel();. When a new class is created, C# handles the initialization of non-nullable variables such as float, int, double, datetime, etc.

Answer №2

Razor takes care of populating the Value field with the corresponding property (in this instance x.ccVersandkosten). It's a convenient feature.

To have an initial null value, ensure that ccVersandkosten is nullable.

Answer №3

Regardless of the data type of your ccShippingCosts property, Razor will always include this attribute in the output. The TextBoxFor helper generates an input element, which is typically used for collecting and sending data to the server, hence it must have a value associated with it.

If you do not require a value for your property, it might be better to consider using a different helper. You could opt to render the property using HiddenFor, or if you simply want to display information, you can create a standard HTML label.

Based on the validation code that was generated, it appears that your property may be marked with the [Required] attribute. It should be noted that all value type properties are automatically considered required. If you explicitly set the [Required] attribute, then your input element must have a value attribute, as this value will be sent to the server and validated by the framework.

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