Set default value of input field with read-only attribute

Question

I have a form that posts persistent data to an SQL database. In my form I have an input field that is at first set to read-only, unless the user selects an option:

My problem is that if the user chooses not to enter a value in the input field, I receive this error:

I tried setting the default value of the input in my javascript, but i receive the same error.

$("#lejeperiode").val(" ");

It doesn't matter whether an empty string or null is inserted into the DB. This is my input field:

<input id="periodeInput" class="form-control" type="text" name="lejeperiode" value="@(Request.Form["lejeperiode"] != null ? Request.Form["lejeperiode"].ToString() : "")"/>

string.IsNullOrEmpty(Request.Form["xxx"]) ? "" : Request.Form["xxx"].ToString() — Tom John, Sep 06 '17 at 09:46
Possible duplicate of [What is a NullReferenceException, and how do I fix it?](https://stackoverflow.com/questions/4660142/what-is-a-nullreferenceexception-and-how-do-i-fix-it) — Tetsuya Yamamoto, Sep 06 '17 at 09:49

score 1 · Accepted Answer · answered Sep 06 '17 at 09:50

1

Modify your code to check if string is empty if so "" will be your default else POST value.

cmd.Parameters.AddWithValue("@lejeperiode", string.IsNullOrEmpty(Request.Form["lejeperiode"]) ? "" : Request.Form["lejeperiode"].ToString())

answered Sep 06 '17 at 09:50

Adrian

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Set default value of input field with read-only attribute

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