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How to generate asp.net control using markup in database

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孤城傲影
孤城傲影 2021-01-23 05:45

How do I generate the controls in a div based on the markup defined in a SQL Server database? Is it possible? If yes, then how? Can anyone give me resources? 

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  • 半阙折子戏
    2021-01-23 06:27

    You could use a placeholder on a page like so:

    <body>
    <form id="form1" runat="server">
    <div>
        <asp:PlaceHolder ID="PlaceHolder1" runat="server"></asp:PlaceHolder>
    </div>
    </form>
</body>

    And in your code behind, you could have several checks (all of which contain SQL statements querying the data in the database). The database could contain a field containing component names such as checkbox, button (various other controls). This saves you storing markup in the database fields..

    Very rough representation of how the code would look like..

    public partial class _Default : System.Web.UI.Page 
{
    protected void Page_Load(object sender, EventArgs e)
    {
    // SQL Code here

    // Datatable code here 
    // End of DataTable code

    // Beginning of IF blocks   
        If (DataTable.Rows.Count > 0) {
        If (your check != "checkbox") {
        this.PlaceHolder1.Controls.Add(new Button(){
            Text = "Added"}
            }
          }
     // More if statements here
       );

    }
}

    Alternatively if you insist on storing asp markup in the database, then you could just feed the asp markup into the placeholder using a loop (if there are more than one rows in your database)

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  • 广开言路
    2021-01-23 06:33

    You can use ParseControl which accepts a string and create controls on the fly.

    The drawback is if server code is in the string, it will not be executed. In addition, you need to attach event manually such as button click events.

    For example, 

    <script runat="server">
    // This server code will not be executed 
</script>
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  • 天命终不由人
    2021-01-23 06:39

    Here is another SO question using jquery ajax to load info from database

    I would recommend having some type of sanitizing intermediary; otherwise you are opening yourself up to cross-site scripting (XSS) issues.

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