set javascript array from DataTable in code behind

Question

Im trying to set an array in Javascript, and then give it values from the DataTable in the code behind like that :

for (var i = 0; i < '<%=dt_questionVideo.Rows.Count - 1 %>'; i++) {
        videoQarray[i] = '<%=Convert.ToInt32(dt_questionVideo.Rows['+i+'][0]) %>';
    }

Im getting an error

Too many characters in character literal

how can I manuover this one ?

Maybe videoQarray[i] = '<%=Convert.ToInt32(dt_questionVideo.Rows[i][0]) %>'; — James Kyburz
– James Kyburz, Commented Jul 24, 2012 at 14:05
@JamesKyburz if I try this one, it says that The name 'i' does not exist in the current context — thormayer
– thormayer, Commented Jul 24, 2012 at 14:07
Ok, well I don't think that method will work. I believe the server tags are executed before the javascript. Any particular reason it needs to be client side? — geekchic
– geekchic, Commented Jul 24, 2012 at 14:08

Jaime Torres · Accepted Answer · 2012-07-24 14:24:31Z

5

You can't really do it that way. If you need a javascript array like that, you're going to have to do something like this in the code behind:

        int[] videoQarray = new int[dt_questionVideo.Rows.Count - 1];
        for (var i = 0; i < dt_questionVideo.Rows.Count - 1; i++) {
            videoQarray[i] = Convert.ToInt32(dt_questionVideo.Rows[i][0]);
        }

        string createArrayScript = string.Format("var videoQarray = [{0}];", string.Join(",", videoQarray));

        Page.ClientScript.RegisterStartupScript(this.GetType(), "registerVideoQArray", createArrayScript, true);

edited Jul 24, 2012 at 14:24

answered Jul 24, 2012 at 14:08

Jaime Torres

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2 Comments

thormayer Over a year ago

and then I can use the "registerVideoQArray" as my client array ?

Jaime Torres Over a year ago

no, 'videoQarray' will be your array. "registerVideoQArray" is just a unique name provided to the script manager.

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