Reviewing the dropdown checklist according to the information stored in the database

I am looking to validate the dropdown checklist based on data stored in a database.

Here is my script:

<script>
    function myValidationFunction(parameter) {
        $(document).ready(function () {
            $('#ContentPlaceHolder1_s10').val(parameter);
            $('#ContentPlaceHolder1_s10').dropdownchecklist('refresh');
            $('#ContentPlaceHolder1_s10').dropdownchecklist();
        });
    }
</script>

This is my C# page:

int[] parameterArray;
parameterArray = new int[] { 1,2,3 };

pl.qid = questionID;
Profile.questionid.questionID = questionID;
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "tmp", "<script     type='text/javascript'>myFunction("+para+");</script>", false);

I have been struggling to find a solution. Can anyone provide guidance on how to:

Verify the dropdown checklist based on values from a database?

Thank you in advance!

I am currently using the following dropdown checklist plugin:

javascriptasp.netdropdownchecklist

Answer №1

When using RegisterStartupScript to output a string of Javascript on the page, it is important to properly format the para variable into a correct string representation of its values. Otherwise, you may end up with an output like myFunction(System.Array).

To achieve this, create a string that contains a comma-separated list of the values in para. You can use the String.Join() method for this:

int[] para;
para = new int[] { 1,2,3 };

pl.qid = questionID;
Profile.questionid.questionID = questionID;
ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "tmp",
    "<script type='text/javascript'>myFunction([" + string.join(",", para) + "]);</script>", false);

This will correctly output myFunction([1,2,3]);.

If you encounter issues with server-generated javascript or html behavior, it's always a good practice to check the view source first to understand what is being output and identify areas that require investigation.

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