用什么封装?这里只是用了TagHelper,是啥?自己瞅文档去
在学习使用TagHelper的时候,最希望的就是能有个Demo能够让自己作为参考
找啊找啊找,最后跑去看了看mvc中的TagHelpers,再好好瞅了瞅TagHelper的文档
勉强折腾了几个组件出来,本来想一个组件一个组件写文章的,但是发现国庆已经结束了~
Demo下载
效果预览
代码仅供参考,有不同的意见也忘不吝赐教
CheckBox复选框组件封装
asp-items:绑定单选项 类型为:IEnumerable<SelectListItem>
asp-skin:layui的皮肤样式,默认or原始
1.判断是否可以多选:
var realModelType = For.ModelExplorer.ModelType; //通过类型判断是否为多选 var _allowMultiple = typeof(string) != realModelType && typeof(IEnumerable).IsAssignableFrom(realModelType);
2.获取模型绑定的列表值(多选的情况)
var currentValues = Generator.GetCurrentValues(ViewContext,For.ModelExplorer,expression: For.Name,allowMultiple: true);
这3句代码是在mvc自带的SelectTagHelper中发现的.
因为core其实已经提供了非常多的TagHelper,比如常用的select就是很好的参考对象,封装遇到问题的时候去找找看指不定就又意外的收获.
using System.Collections.Generic; using Microsoft.AspNetCore.Mvc.Rendering; using Microsoft.AspNetCore.Mvc.ViewFeatures; using Microsoft.AspNetCore.Razor.TagHelpers; namespace LayuiTagHelper.TagHelpers { /// <summary> /// 复选框 /// </summary> /// <remarks> /// 当Items为空时显示单个,且选择后值为true /// </remarks> [HtmlTargetElement(CheckBoxTagName)] public class CheckBoxTagHelper : TagHelper { private const string CheckBoxTagName = cl-checkBox; private const string ForAttributeName = asp-for; private const string ItemsAttributeName = asp-items; private const string SkinAttributeName = asp-skin; private const string SignleTitleAttributeName = asp-title; protected IHtmlGenerator Generator { get; } public CheckBoxTagHelper(IHtmlGenerator generator) { Generator = generator; } [ViewContext] public ViewContext ViewContext { get; set; } [HtmlAttributeName(ForAttributeName)] public ModelExpression For { get; set; } [HtmlAttributeName(ItemsAttributeName)] public IEnumerable<SelectListItem> Items { get; set; } [HtmlAttributeName(SkinAttributeName)] public CheckBoxSkin Skin { get; set; } = CheckBoxSkin.默认; [HtmlAttributeName(SignleTitleAttributeName)] public string SignleTitle { get; set; } public override void Process(TagHelperContext context, TagHelperOutput output) { //获取绑定的生成的Name属性 string inputName = ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(For?.Name); string skin = string.Empty; #region 风格 switch (Skin) { case CheckBoxSkin.默认: skin = ; break; case CheckBoxSkin.原始: skin = primary; break; } #endregion #region 单个复选框 if (Items == null) { output.TagName = input; output.TagMode = TagMode.SelfClosing; output.Attributes.Add(type, checkBox); output.Attributes.Add(id, inputName); output.Attributes.Add(name, inputName); output.Attributes.Add(lay-skin, skin); output.Attributes.Add(title, SignleTitle); output.Attributes.Add(value, true); if (For?.Model?.ToString().ToLower() == true) { output.Attributes.Add(checked, checked); } return; } #endregion #region 复选框组 var currentValues = Generator.GetCurrentValues(ViewContext,For.ModelExplorer,expression: For.Name,allowMultiple: true); foreach (var item in Items) { var checkBox = new TagBuilder(input); checkBox.TagRenderMode = TagRenderMode.SelfClosing; checkBox.Attributes[type] = checkBox; checkBox.Attributes[id] = inputName; checkBox.Attributes[name] = inputName; checkBox.Attributes[lay-skin] = skin; checkBox.Attributes[title] = item.Text; checkBox.Attributes[value] = item.Value; if (item.disabled) { checkBox.Attributes.Add(disabled, disabled); } if (item.Selected || (currentValues != null && currentValues.Contains(item.Value))) { checkBox.Attributes.Add(checked, checked); } output.Content.AppendHtml(checkBox); } output.TagName = ; #endregion } } public enum CheckBoxSkin { 默认, 原始 } }
使用示例
@{ string sex=男; var Items=new List<SelectListItem>() { new SelectListItem() { Text = 男, Value = 男 }, new SelectListItem() { Text = 女, Value = 女}, new SelectListItem() { Text = 不详, Value = 不详,disabled=true } }; } <cl-checkBox asp-items=Model.Items asp-for=Hobby1 asp-skin=默认></cl-checkBox> <cl-checkBox asp-for=Hobby3 asp-title=单个复选框></cl-checkBox>
Radio单选框组件封装
太简单了,直接上代码了
using System; using System.Collections.Generic; using Microsoft.AspNetCore.Mvc.Rendering; using Microsoft.AspNetCore.Mvc.ViewFeatures; using Microsoft.AspNetCore.Razor.TagHelpers; namespace LayuiTagHelper.TagHelpers { /// <summary> /// 单选框 /// </summary> [HtmlTargetElement(RadioTagName)] public class RadioTagHelper : TagHelper { private const string RadioTagName = cl-radio; private const string ForAttributeName = asp-for; private const string ItemsAttributeName = asp-items; [ViewContext] public ViewContext ViewContext { get; set; } [HtmlAttributeName(ForAttributeName)] public ModelExpression For { get; set; } [HtmlAttributeName(ItemsAttributeName)] public IEnumerable<SelectListItem> Items { get; set; } public override void Process(TagHelperContext context, TagHelperOutput output) { if (For == null) { throw new ArgumentException(必须绑定模型); } foreach (var item in Items) { var radio = new TagBuilder(input); radio.TagRenderMode = TagRenderMode.SelfClosing; radio.Attributes.Add(id, ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(For.Name)); radio.Attributes.Add(name, ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(For.Name)); radio.Attributes.Add(value, item.Value); radio.Attributes.Add(title, item.Text); radio.Attributes.Add(type, radio); if (item.disabled) { radio.Attributes.Add(disabled, disabled); } if (item.Selected || item.Value == For.Model?.ToString()) { radio.Attributes.Add(checked, checked); } output.Content.AppendHtml(radio); } output.TagName = ; } } }
使用示例
@{ string sex=男; var Items=new List<SelectListItem>() { new SelectListItem() { Text = 男, Value = 男 }, new SelectListItem() { Text = 女, Value = 女}, new SelectListItem() { Text = 不详, Value = 不详,disabled=true } }; } <cl-radio asp-items=@Items asp-for=sex></cl-radio>
最后再来一个开关组件
单个复选框其实可以直接用开关代替,恰巧layui中也有,于是也将开关单独的封装了一下,代码大同小异
就这个
使用也简单: <cl-switch asp-for=Hobby4 asp-switch-text=开启|关闭></cl-switch>
namespace LayuiTagHelper.TagHelpers { /// <summary> /// 开关 /// </summary> [HtmlTargetElement(SwitchTagName)] public class SwitchTagHelper : TagHelper { private const string SwitchTagName = cl-switch; private const string ForAttributeName = asp-for; private const string SwitchTextAttributeName = asp-switch-text; protected IHtmlGenerator Generator { get; } public SwitchTagHelper(IHtmlGenerator generator) { Generator = generator; } [ViewContext] public ViewContext ViewContext { get; set; } [HtmlAttributeName(ForAttributeName)] public ModelExpression For { get; set; } [HtmlAttributeName(SwitchTextAttributeName)] public string SwitchText { get; set; } = ON|OFF; public override void Process(TagHelperContext context, TagHelperOutput output) { string inputName = ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(For?.Name); output.TagName = input; output.TagMode = TagMode.SelfClosing; if (For?.Model?.ToString().ToLower() == true) { output.Attributes.Add(checked, checked); } output.Attributes.Add(type, checkBox); output.Attributes.Add(id, inputName); output.Attributes.Add(name, inputName); output.Attributes.Add(value, true); output.Attributes.Add(lay-skin, switch); output.Attributes.Add(lay-text, SwitchText); } } }
总结
封装的还很粗糙,正常的使用是没问题的,若发现问题,还望指出。
因为layui是直接在页面加载后渲染的表单标签,故没有多少和layui相关的样式。
除了一些表单组件之外,其实还对选项卡,时间轴,分页,代码显示组件做了一些封装,这些后面再介绍了。
当然,有兴趣的朋友可以先去一睹为快看看都实现了哪些组件
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