Razor pages hide a field depending on other field value[Answered] RSS

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  marco1892

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  Razor pages hide a field depending on other field value

  Sep 21, 2019 04:43 PM|marco1892|LINK

  Hello everybody,

  I work actually on asp.net core 2.2 with razor pages. In my index page, i have somme fields and  a boolean field : "confirmed" with another field: "Confirmation date".

  I want to display confirmation date when "confirmed" is true and to hide it otherwise. This is what i have done:

  razor page:

  <th style="@(Model.Travel[0].Confirmed==true ? "display:block" : "display:none")">
  @Html.DisplayNameFor(model => model.Travel[0].ConfirmationDate)
  </th>

  and this is the getAsync:

  public IList<Travel> Travel { get;set; }

  public async Task OnGetAsync()
  {
  Travel = await _context.Travel.ToListAsync();
  }

  My probleme is that i get this error :

  "ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index"

  i know this is because there is not yet travel saved in my database, but i do not know how to make the condition. Please, any help from you is welcome.

  thank you in advance

• • Reply
  Mikesdotnett...

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  Re: Razor pages hide a field depending on other field value

  Sep 21, 2019 04:56 PM|Mikesdotnetting|LINK

  Initialise your list:

  public IList<Travel> Travel { get;set; } = new List<Travel>();

  Then you can test for .Any():

  @if(Model.Travel.Any())
{
<th style="@(Model.Travel[0].Confirmed ? "display:block" : "display:none")">
@Html.DisplayNameFor(model => model.Travel[0].ConfirmationDate)
</th>
}
else
{
...
}

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• • Reply
  marco1892

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  Re: Razor pages hide a field depending on other field value

  Sep 21, 2019 06:05 PM|marco1892|LINK

  Thank you Mikes ! thats worked !

  Thank you very much !