How to Perform Client-Side Validation on Dynamically Added Textboxes in a Table?

Understanding the Problem

This issue arises when attempting to apply validation classes to dynamic textboxes within a table. The goal is to perform validation on these textboxes when the "Save" button is clicked.

Solution

To resolve this issue, it's crucial to implement the following steps:

1. Include Data-val Attributes: Assign the necessary data-val attributes to the textboxes, along with placeholder elements for validation messages. These attributes are crucial for client-side validation using jquery.validate.unobtrusive.js.
2. Initial Default ClsTargetInfo Object: Start by adding a default ClsTargetInfo object to the TargetInfo property in your model and generate its HTML in the view.
3. Create a Hidden Element for Indexer: Within the table row, include a hidden input element for the indexer. This allows non-consecutive indexers to be posted and bound to the collection.
4. Copy HTML Template: Inspect the HTML generated for the table row. Copy it inside a hidden element placed outside the form tags, replacing all indexers with a dummy character (#).
5. Clone and Append to Table: In the JavaScript code, clone the new row, update the indexers, and append it to the table.
6. Reparse Validator: After adding the new row, reparse the validator using $.validator.unobtrusive.parse(form).

Additional Notes

• Unobtrusive validation relies on parsing data-val attributes at the initial rendering of the form. Thus, re-parsing is necessary when adding dynamic content.
• The hidden input for the indexer permits the deletion of any row in the collection.
• Consider using CSS instead of inline styles for better maintainability and performance.
• Utilize partial views (BeginCollectionItem helper) for easier maintainability when adding rows purely on the client side.

The above is the detailed content of How to Perform Client-Side Validation on Dynamically Added Textboxes in a Table?. For more information, please follow other related articles on the PHP Chinese website!