public override async Task ProcessAsync(TagHelperContext context, TagHelperOutput output)
{
// Get input tag
var inputTag = new InputTagHelper(_htmlGenerator)
{
For = this.For,
ViewContext = this.ViewContext
};
// Get label tag
var labelTag = new LabelTagHelper(_htmlGenerator)
{
For = this.For,
ViewContext = this.ViewContext
};
// Get validation tag
var validationTag = new ValidationMessageTagHelper(_htmlGenerator)
{
For = this.For,
ViewContext = this.ViewContext
};
output.Content.AppendHtml(await labelTag.GetGeneratedContent(_htmlEncoder, "label", TagMode.StartTagAndEndTag, new TagHelperAttributeList {
new TagHelperAttribute("class", "col-md-2 control-label")
}));
// Field and validation within the same div
output.Content.AppendHtml("<div class=\"col-md-10\">");
output.Content.AppendHtml(await inputTag.GetGeneratedContent(_htmlEncoder, "input", TagMode.StartTagAndEndTag, new TagHelperAttributeList {
new TagHelperAttribute("class", "form-control")
}));
output.Content.AppendHtml(await validationTag.GetGeneratedContent(_htmlEncoder, "span", TagMode.StartTagAndEndTag, new TagHelperAttributeList {
new TagHelperAttribute("class", "text-danger")
}));
output.Content.AppendHtml("</div>");
string classValue = "form-group";
if (output.Attributes.ContainsName("class"))
{
classValue += " " + output.Attributes["class"].Value;
}
output.Attributes.SetAttribute("class", classValue);
}
