


How to Implement Server-Side Validation for Dynamic Textboxes in a Table?
Dec 29, 2024 am 11:33 AMSet 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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