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I have a site that dynamically creates two arrays of Lat/Long values based on the stores that the currently logged in user can see. If the user can only see one location then I get an error about array length needing to be a finite integer. When I look at the source I see 

var ls =  new Array(45.056124);

is being created on the page dynamically which is what I'm expecting. Except I think it is treating it as if I am trying to set the length of the array instead of set the first element to that value.

How do I go about creating an array using the ClientScript.RegisterArrayDeclaration function to hold a single double value using vb.net?

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I found the answer thanks to Konrad Rudolph. I solved it by surrounding the value portion of the ClientScript.RegisterArrayDeclaration call with double quotes and then implementing the javascript parseFloat function anywhere that the array was used. – Mike_OBrien Sep 1 '11 at 19:25

3 Answers

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Doesn’t the documentation of the RegisterArrayDeclaration method give all the necessary information?

Your particular array would look as follows:

Page.ClientScript.RegisterArrayDeclaration("ls", "45.056124")
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Looking at the documentation again lead me to the parseInt function so expanding on that I found the parseFloat function and that did the trick. Guess I had just been looking at that page too much in the last few days so a step back was all it took. – Mike_OBrien Sep 1 '11 at 19:27
up vote 5 down vote

Try doing this:

var ls =  [45.056124]; //sets it as an array of one value
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I'm using the ClientScript.RegisterArrayDeclaration function to create the array so I think I'm locked into it being declared using the "new Array()" method – Mike_OBrien Sep 1 '11 at 19:05
up vote 0 down vote

This is one of JavaScript's bad parts. The Array constructor, when passed one Number argument (remember, in JavaScript all number literals are... Numbers), initializes the array to a predefined length.

That means:

var ls = new Array(45);

ls.length === 45; // This is true

When passed a non-integer Number, the Array constructor throws a RangeError indicating that it isn't a valid length.

As a rule of thumb, as it already been said, always use the array literal to create arrays:

var ls = [45.056124];
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