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詳解asp.net core封裝layui組件示例分享

 更新時間:2017年10月09日 08:25:33   作者:易墨  
本篇文章主要介紹了詳解asp.net core封裝layui組件示例分享,小編覺得挺不錯的,現(xiàn)在分享給大家,也給大家做個參考。一起跟隨小編過來看看吧

用什么封裝?這里只是用了TagHelper,是啥?自己瞅文檔去

在學(xué)習(xí)使用TagHelper的時候,最希望的就是能有個Demo能夠讓自己作為參考

  • 怎么去封裝一個組件?
  • 不同的情況怎么去實現(xiàn)?
  • 有沒有更好更高效的方法?

找啊找啊找,最后跑去看了看mvc中的TagHelpers,再好好瞅了瞅TagHelper的文檔

勉強折騰了幾個組件出來,本來想一個組件一個組件寫文章的,但是發(fā)現(xiàn)國慶已經(jīng)結(jié)束了~

Demo下載

效果預(yù)覽

代碼僅供參考,有不同的意見也忘不吝賜教

Checkbox復(fù)選框組件封裝

標(biāo)簽名稱:cl-checkbox

標(biāo)簽屬性: asp-for:綁定的字段,必須指定

  1. asp-items:綁定單選項 類型為:IEnumerable<SelectListItem>
  2. asp-skin:layui的皮膚樣式,默認or原始
  3. asp-title:若只是一個復(fù)選框時顯示的文字,且未指定items,默認Checkbox的值為true

其中在封裝的時候看源代碼發(fā)現(xiàn)兩段非常有用的代碼

1.判斷是否可以多選:

復(fù)制代碼 代碼如下:

var realModelType = For.ModelExplorer.ModelType; //通過類型判斷是否為多選 var _allowMultiple = typeof(string) != realModelType && typeof(IEnumerable).IsAssignableFrom(realModelType);

2.獲取模型綁定的列表值(多選的情況)

復(fù)制代碼 代碼如下:

var currentValues = Generator.GetCurrentValues(ViewContext,For.ModelExplorer,expression: For.Name,allowMultiple: true);

這3句代碼是在mvc自帶的SelectTagHelper中發(fā)現(xiàn)的.

因為core其實已經(jīng)提供了非常多的TagHelper,比如常用的select就是很好的參考對象,封裝遇到問題的時候去找找看指不定就又意外的收獲.

CheckboxTagHelper代碼

using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc.Rendering;
using Microsoft.AspNetCore.Mvc.ViewFeatures;
using Microsoft.AspNetCore.Razor.TagHelpers;

namespace LayuiTagHelper.TagHelpers
{
 /// <summary>
 /// 復(fù)選框
 /// </summary>
 /// <remarks>
 /// 當(dāng)Items為空時顯示單個,且選擇后值為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.默認;

  [HtmlAttributeName(SignleTitleAttributeName)]
  public string SignleTitle { get; set; }

  public override void Process(TagHelperContext context, TagHelperOutput output)
  {
   //獲取綁定的生成的Name屬性
   string inputName = ViewContext.ViewData.TemplateInfo.GetFullHtmlFieldName(For?.Name);
   string skin = string.Empty;
   #region 風(fēng)格
   switch (Skin)
   {
    case CheckboxSkin.默認:
     skin = "";
     break;
    case CheckboxSkin.原始:
     skin = "primary";
     break;
   }
   #endregion
   #region 單個復(fù)選框
   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 復(fù)選框組
   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
 {
  默認,
  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 = "不詳", Value = "不詳",Disabled=true }
   };
}
<cl-checkbox asp-items="Model.Items" asp-for="Hobby1" asp-skin="默認"></cl-checkbox>
<cl-checkbox asp-for="Hobby3" asp-title="單個復(fù)選框"></cl-checkbox>

Radio單選框組件封裝

標(biāo)簽名稱:cl-radio

  1. 標(biāo)簽屬性: asp-for:綁定的字段,必須指定
  2. asp-items:綁定單選項 類型為:IEnumerable<SelectListItem>

太簡單了,直接上代碼了

RadioTagHelper代碼

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>
 /// 單選框
 /// </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("必須綁定模型");
   }
   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 = "不詳", Value = "不詳",Disabled=true }
   };
}
<cl-radio asp-items="@Items" asp-for="sex"></cl-radio>

最后再來一個開關(guān)組件

單個復(fù)選框其實可以直接用開關(guān)代替,恰巧layui中也有,于是也將開關(guān)單獨的封裝了一下,代碼大同小異

就這個 

使用也簡單: <cl-switch asp-for="Hobby4" asp-switch-text="開啟|關(guān)閉"></cl-switch>

namespace LayuiTagHelper.TagHelpers
{
 /// <summary>
 /// 開關(guān)
 /// </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);

  }
 }
}

總結(jié)

封裝的還很粗糙,正常的使用是沒問題的,若發(fā)現(xiàn)問題,還望指出。

因為layui是直接在頁面加載后渲染的表單標(biāo)簽,故沒有多少和layui相關(guān)的樣式。

除了一些表單組件之外,其實還對選項卡,時間軸,分頁,代碼顯示組件做了一些封裝,這些后面再介紹了。

當(dāng)然,有興趣的朋友可以先去一睹為快看看都實現(xiàn)了哪些組件

倉庫地址

WeDemo分支clone命令:git clone https://git.coding.net/yimocoding/WeDemo.git -b LayuiTagHelper

選項卡,時間軸,分頁,代碼顯示等Demo打包下載

以上就是本文的全部內(nèi)容,希望對大家的學(xué)習(xí)有所幫助,也希望大家多多支持腳本之家。

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