链接<a> generated after AJAX doesn&#39;t work

Question

I am working on a post-comments project. Using AJAX I am generating comments. Each generated comments has Like button. But new generated Like button doesn't work until I refresh the page. The generated link is shown below.

<div class="comment-body-container">
    <div class="comment-body">
        Oye jetha lali
        <a class="like-comment comment-like-color comment_main_id_45" 
            data-like-comment-id="45" href="javascript:;">
                <i class="fa fa-thumbs-up"></i>
        </a>
    </div>
    <div class="liked-this-comment liked_this_comment_45"></div>
</div>

Output after refreshing the page.

<div class="comment-body-container">                                                                          
    <div class="comment-body">
        Oye jetha lali                                                                               
        <a class="like-comment comment-like-color comment_main_id_45" 
            data-like-comment-id="45" href="javascript:;">                                                                                  
            <i class="fa fa-thumbs-up" aria-hidden="true"></i>                                                                               
        </a>                                                                            
    </div>                                                                          
    <div class="liked-this-comment liked_this_comment_45">                                                                                                                                                          
    </div>                                                                       
</div>

Output is almost same. But it doesn't work until I refresh the page. Could some one please provide me the solution for it.

Answer 1

对于动态生成的内容，您必须在内容加载后重新应用事件，或者更好的是，将事件委派给您的“喜欢”按钮，诸如此类：

<Window x:Class="WpfInkCavasSaveImage.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="MainWindow"  Height="1091" Width="873" WindowState="Maximized">
    <Grid Margin="0,0,0,173" >
        <Grid.RowDefinitions>
            <RowDefinition Height="1200*" />
            <RowDefinition Height="50" />
        </Grid.RowDefinitions>    
        <InkCanvas HorizontalAlignment="Stretch" Margin="1,1,1,10" x:Name="inkCanvas1" VerticalAlignment="Stretch" Width="Auto" RenderTransformOrigin="0.5,0.5" Background="LightGreen" SnapsToDevicePixels="True" IsManipulationEnabled ="True"  Grid.RowSpan="2">
            <InkCanvas.CacheMode>
                <BitmapCache/>
            </InkCanvas.CacheMode>
            <InkCanvas.DefaultDrawingAttributes>
                <DrawingAttributes Color="Black" FitToCurve="True" Height="2.0031496062992127" IgnorePressure="False" IsHighlighter="False" StylusTip="Ellipse" StylusTipTransform="Identity" Width="2.0031496062992127"/>    
            </InkCanvas.DefaultDrawingAttributes>
        </InkCanvas>
        <Button x:Name="btnSaveImage" Content="Save Ink Canvas" Height="41" Width="155" Canvas.Left="100" Canvas.Top="900"  VerticalAlignment="Top" HorizontalAlignment="Left" RenderTransformOrigin="1.417,14.6" Margin="15,93,0,-84" Background="SkyBlue" Click="btnSaveInkCanvas" Grid.Row="1" BorderBrush="{x:Null}"/>
    </Grid>

</Window>


using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.AccessControl;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace WpfInkCavasSaveImage
{
    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            inkCanvas1.Width = System.Windows.SystemParameters.WorkArea.Width;
            inkCanvas1.Height = System.Windows.SystemParameters.WorkArea.Height;
        }
        private void btnSaveInkCanvas(object sender, RoutedEventArgs e)
        {
            string subpath = Directory.GetCurrentDirectory();
            SaveFileDialog saveFileDialog12 = new SaveFileDialog();
            saveFileDialog12.Filter = "JPeg Image|*.jpg|Bitmap Image|*.bmp|Gif Image|*.gif|Png File|*.png";
            saveFileDialog12.Title = "Save an Image File";
            saveFileDialog12.InitialDirectory = subpath;
            saveFileDialog12.ShowDialog();

            if (saveFileDialog12.FileName == "") return;
            subpath = saveFileDialog12.FileName.Substring(0, saveFileDialog12.FileName.Length - saveFileDialog12.SafeFileName.Length);

            RenderTargetBitmap rtb = new RenderTargetBitmap((int)inkCanvas1.Width, (int)inkCanvas1.Height, 96d, 96d, PixelFormats.Default);
            rtb.Render(inkCanvas1);
            DrawingVisual dvInk = new DrawingVisual();
            DrawingContext dcInk = dvInk.RenderOpen();
            dcInk.DrawRectangle(inkCanvas1.Background, null, new Rect(0d, 0d, inkCanvas1.Width, inkCanvas1.Height));
            foreach (System.Windows.Ink.Stroke stroke in inkCanvas1.Strokes)
            {
                stroke.Draw(dcInk);
            }
            dcInk.Close();

            FileStream fs = File.Open(saveFileDialog12.FileName, FileMode.OpenOrCreate);//save bitmap to file
            System.Windows.Media.Imaging.JpegBitmapEncoder encoder1 = new JpegBitmapEncoder();
            encoder1.Frames.Add(BitmapFrame.Create(rtb));
            encoder1.Save(fs);
            fs.Close();
        }
    }
}

事件委托可以很好地处理动态生成的内容，是处理这种特定情况的首选方法。