How to Implement Server-Side Validation for Dynamic Textboxes in a Table?

Set Class Validation for Dynamic Textboxes in a Table

Problem:

A table contains a row of dynamic textboxes, but class validation needs to be applied to each textbox for server-side validation.

Solution:

The necessary data-val attributes for validation and validation message placeholders are missing in the dynamic textboxes. Here's how to implement them:

1. Add Validation Attributes and Placeholder:

In the view, add data-val attributes and their corresponding placeholder elements for displaying validation messages:

@Html.TextBoxFor(m => m.TargetInfo[i].TargetColor_U, new { id = "", @class = "form-control" })
@Html.ValidationMessageFor(m => m.TargetInfo[i].TargetColor_U)

2. Include Placeholder for Remaining Textboxes:

If not already present, add data-val attributes and validation message placeholders for the remaining textboxes.

3. Transform Dynamic Rows:

In the script, clone the template row with placeholders (# for indexer) and populate it with real data:

var clone = newrow.clone(); // clone the new row
clone.html($(clone).html().replace(/#/g, index)); // update the indexer of the clone

4. Insert New Row and Reparse Validation:

Insert the new row into the table and reparse the validation to apply it to the dynamic textboxes:

tablebody.append(row); // add the new row to the table
form.data('validator', null);
$.validator.unobtrusive.parse(form);

Additional Notes:

• Use CSS instead of inline styles for styling the table.
• Consider using the BeginCollectionItem helper with a partial view for maintainability.

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