There's no @Html.Button !

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粉色の甜心
粉色の甜心 2020-12-04 14:55

this is weird. I see references out there for @Html.Button() but when I type that Intellisense doesn\'t find such a helper... there\'s dropdownlist, hidden, editors, et cet

5条回答
  •  既然无缘
    2020-12-04 15:48

    To expand on the accepted answer, so you can bind a submit button to a model property but have different text:

    @Html.ButtonFor(m => m.Action, Model.LabelForCurrentAction(), new { @class = "btn btn-primary btn-large", type = "submit" })
    

    Using the following slightly modified Button helper class:

    /// 
    /// Via https://stackoverflow.com/questions/5955571/theres-no-html-button
    /// 
    public static class HtmlButtonExtension
    {
    
        public static MvcHtmlString Button(this HtmlHelper helper, object innerHtml, object htmlAttributes)
        {
            return helper.Button(innerHtml, HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes));
        }
    
        public static MvcHtmlString Button(this HtmlHelper helper, object innerHtml, IDictionary htmlAttributes)
        {
            var builder = new TagBuilder("button") { InnerHtml = innerHtml.ToString() };
            builder.MergeAttributes(htmlAttributes);
            return MvcHtmlString.Create(builder.ToString());
        }
    
        public static MvcHtmlString ButtonFor(this HtmlHelper html,
                                                            Expression> property,
                                                            object innerHtml,
                                                            object htmlAttributes)
        {
            // lazily based on TextAreaFor
    
            var attrs = HtmlHelper.AnonymousObjectToHtmlAttributes(htmlAttributes);
    
            var name = ExpressionHelper.GetExpressionText(property);
            var metadata = ModelMetadata.FromLambdaExpression(property, html.ViewData);
    
            string fullName = html.ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(name);
    
            ModelState modelState;
            if (html.ViewData.ModelState.TryGetValue(fullName, out modelState) && modelState.Errors.Count > 0)
            {
                if( !attrs.ContainsKey("class") ) attrs["class"] = string.Empty;
                attrs["class"] += " " + HtmlHelper.ValidationInputCssClassName;
                attrs["class"] = attrs["class"].ToString().Trim();
            }
            var validation = html.GetUnobtrusiveValidationAttributes(name, metadata);
            if(null != validation) foreach(var v in validation) attrs.Add(v.Key, v.Value);
    
            string value;
            if (modelState != null && modelState.Value != null)
            {
                value = modelState.Value.AttemptedValue;
            }
            else if (metadata.Model != null)
            {
                value = metadata.Model.ToString();
            }
            else
            {
                value = String.Empty;
            }
    
            attrs["name"] = name;
            attrs["Value"] = value;
            return html.Button(innerHtml, attrs);
        }
    }
    

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