Is there a way to show a progress bar while dynamically generating controls based on the user selection from a dropdown list? The values for these controls are retrieved from a database.
Is there a way to show a progress bar while dynamically generating controls based on the user selection from a dropdown list? The values for these controls are retrieved from a database.
To include a download image on the form, simply utilize JavaScript to trigger the onchange event when a user selects an item from the dropdown list. Here is a basic example demonstrating how to register the event handler:
protected void Page_Load(object sender, EventArgs e)
{
dropdownlist1.Attributes.Add("onchange", "document.getElementById(\"loading_image\").style.visibility = \"visible\";");
}
Prior to this step, ensure that the image is embedded within the form using the following code snippet:
<img style="visibility:hidden;" src="imageurl" runat="server" id="loading_image" />
When the combobox text matches "type selected value", then proceed to load the progress bar.
Once the user has chosen their selection, add an <img> element featuring a dynamic .gif progress indicator. Once the controls are back to be loaded on the page, employ JavaScript to remove the <img> element and include your own set of controls.
To accurately depict progress, utilize a Context-Sensitive progress bar. You can learn more about displaying real-time progress during server-side operations in this informative article.
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