Tips for manipulating HTML using JavaScript and detecting the updates in ASP.NET after a postback

This is a unique challenge, and despite my efforts to find a solution in various sources, I couldn't overcome this specific scenario.

I want the user to input multiple values into a single text field, like this:

<div style="margin-left: 5px; display: block;">
    <div id="divTemplateLine" style="display: none;">
        <a href="javascript:" onclick="javascript: RemoveLine(this);">x</a>
    </div>
</div>

With Javascript, clicking the Add button should clone divTemplateLine and incorporate the text within the parent node. This part is working smoothly for me.

Now, I am faced with the task of retrieving all these lines (salmon, soup, miso, Japanese) during postback. It seems like I might have to delve into parsing HTML since these added divs are not set as "runat" server.

A possible solution could involve using a server-run hidden value that JavaScript can continuously update. While this method is effective, I am curious about parsing out HTML elements and nodes similar to what I accomplished in JavaScript, especially since my actual situation involves more complexity than a single value, making a hidden value less suitable.

I would appreciate any suggestions or insights on this matter.

c#javascriptasp.net

Answer №1

To ensure data accuracy, it is recommended to maintain two versions of your data - one that is displayed to the user and another stored in a hidden input field for submission and retrieval of selected data.

For instance, if a user enters 'salmon', this information should be reflected both in the visible HTML content and a concealed input control that can be serialized. Similarly, when a user removes an item, it should be deleted from the hidden control as well.

Ultimately, after processing the submitted data, you will have a final selection result that can be posted back, analyzed, and ultimately saved into your database.

<input name="final_select" type="hidden" value="salmon;soup;miso;japanese" />

Answer №2

@CarEnthusiast: Here is a simple way to implement a text box with auto complete functionality:

<asp:TextBox ID="txtCustName" AutoPostBack="true" AutoComplete="off" runat="server"
                OnTextChanged="txtCustName_TextChanged" />
            <cc1:AutoCompleteExtender ID="ace1" TargetControlID="txtCustName" ServiceMethod="GetCustomers"
                MinimumPrefixLength="1" OnClientItemSelected="ace1_itemSelected" FirstRowSelected="true"
                runat="server" />

The Auto Complete Extender uses the service method property to update the list view when text is entered in the text box.

<<****** The Webmethod code is provided below ******>>

 ListBox list = new ListBox();
[WebMethod]
public static DataSet GetCustomers(string prefixText)
{
   list .Items.Add(New ListItem(prefixText, 0));

}

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