Is there a way to share an enum between Code behind .Net (VB or C#) and javascript so they both use the same values?
can we register an enum into the clientScript..?
Edit: The question is: Is there a way to share a variable that act like an enum in .Net and do the same job in javascript. I could declare both in javascript and .Net but if someone modify the code later and juste change it in 1 place, everything will blow up... This is why I am looking for somehting "shared"
Thanks
//The type of enum we want to use
var enm = typeof(AcceptRejectRule); //or any other enum
//Create the javascript string
var str = "var " + enm.Name + " = {\n" +
String.Join(",\n",
Enum.GetValues(enm).Cast<object>()
.Select (o => Enum.GetName(enm, o) + ": " + ((int)o))) +
"\n};";
//Register the javascript to the page for rendering
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), enm.Name, str, true);
Yes, you can have a .NET enum mirrored in javascript:
C#:
enum Days {Sat, Sun, Mon, Tue, Wed, Thu, Fri};
JS:
var Days = {
Sat: 0,
...
Fri: 6
};
Note that this is just an object named Days with properties that have numeric values. There is no language implementation of an Enum in javascript.
If you want something to automagically convert your C# enum to javascript, just use GetValues to iterate over the C# enum and inject it as a javascript object declaration. It boils down to string concatenation, there is nothing in the .NET framework to do this for you.
Already answered but thought I would share my solution as well:
public enum UpdateOptions
{
Create = 0,
Read,
Update,
Delete,
None
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine(ToJSLiteral<UpdateOptions>());
Console.ReadKey();
}
static string ToJSLiteral<T>() where T : struct
{
Type type = typeof(T);
StringBuilder sb = new StringBuilder();
int[] values = Enum.GetValues(type).Cast<int>().ToArray();
sb.Append("var " + type.Name + " = {\n");
foreach(int value in values)
{
string name = Enum.GetName(type, value);
sb.Append(name + " : " + value + ",\n");
}
sb.Length -= 2;
sb.Append("\n};");
return sb.ToString();
}
}
