HTMLAgilityPack error: “Multiple node elements can't be created.”



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2















I'm attempting to use the HTMLAgilityPack to get retrieve and edit inner text of some HTML. The inner text of each node i retrieve needs to be checked for matching strings and those matching strings to be highlighted like so:



var HtmlDoc = new HtmlDocument();
HtmlDoc.LoadHtml(item.Content);

var nodes = HtmlDoc.DocumentNode.SelectNodes("//div[@class='guide_subtitle_cell']/p");
foreach (HtmlNode htmlNode in nodes)

htmlNode.ParentNode.ReplaceChild(HtmlTextNode.CreateNode(Methods.HighlightWords(htmlNode.InnerText, searchstring)), htmlNode);



This is the code for the HighlightWords method I use:



public static string HighlightWords(string input, string searchstring)



Can anyone suggest how to get this working or indicate what i'm doing wrong?










share|improve this question




























    2















    I'm attempting to use the HTMLAgilityPack to get retrieve and edit inner text of some HTML. The inner text of each node i retrieve needs to be checked for matching strings and those matching strings to be highlighted like so:



    var HtmlDoc = new HtmlDocument();
    HtmlDoc.LoadHtml(item.Content);

    var nodes = HtmlDoc.DocumentNode.SelectNodes("//div[@class='guide_subtitle_cell']/p");
    foreach (HtmlNode htmlNode in nodes)

    htmlNode.ParentNode.ReplaceChild(HtmlTextNode.CreateNode(Methods.HighlightWords(htmlNode.InnerText, searchstring)), htmlNode);



    This is the code for the HighlightWords method I use:



    public static string HighlightWords(string input, string searchstring)



    Can anyone suggest how to get this working or indicate what i'm doing wrong?










    share|improve this question
























      2












      2








      2


      1






      I'm attempting to use the HTMLAgilityPack to get retrieve and edit inner text of some HTML. The inner text of each node i retrieve needs to be checked for matching strings and those matching strings to be highlighted like so:



      var HtmlDoc = new HtmlDocument();
      HtmlDoc.LoadHtml(item.Content);

      var nodes = HtmlDoc.DocumentNode.SelectNodes("//div[@class='guide_subtitle_cell']/p");
      foreach (HtmlNode htmlNode in nodes)

      htmlNode.ParentNode.ReplaceChild(HtmlTextNode.CreateNode(Methods.HighlightWords(htmlNode.InnerText, searchstring)), htmlNode);



      This is the code for the HighlightWords method I use:



      public static string HighlightWords(string input, string searchstring)



      Can anyone suggest how to get this working or indicate what i'm doing wrong?










      share|improve this question














      I'm attempting to use the HTMLAgilityPack to get retrieve and edit inner text of some HTML. The inner text of each node i retrieve needs to be checked for matching strings and those matching strings to be highlighted like so:



      var HtmlDoc = new HtmlDocument();
      HtmlDoc.LoadHtml(item.Content);

      var nodes = HtmlDoc.DocumentNode.SelectNodes("//div[@class='guide_subtitle_cell']/p");
      foreach (HtmlNode htmlNode in nodes)

      htmlNode.ParentNode.ReplaceChild(HtmlTextNode.CreateNode(Methods.HighlightWords(htmlNode.InnerText, searchstring)), htmlNode);



      This is the code for the HighlightWords method I use:



      public static string HighlightWords(string input, string searchstring)



      Can anyone suggest how to get this working or indicate what i'm doing wrong?







      c# html regex






      share|improve this question













      share|improve this question











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      asked Nov 16 '18 at 14:24









      CorrineJWCorrineJW

      426




      426






















          2 Answers
          2






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          0














          The problem is that HtmlTextNode.CreateNode can only create one node. When you add a <span> inside, that's another node, and CreateNode throws the exception you see.



          Make sure that you are only doing a search and replace on the lowest leaf nodes (nodes with no children). Then rebuild that node by:



          1. Create a new empty node to replace the old one

          2. Search for the text in .InnerText

          3. Use HtmlTextNode.Create to add the plain text before the text you want to highlight

          4. Then add your new <span> with the highlighted text with HtmlNode.CreateNode

          5. Then search for the next occurrence (start back at 1) until no more occurrences are found.





          share|improve this answer






























            0














            Your function HighlightWords must be returning multiple top-level HTML nodes. For example:



            <p>foo</p>
            <span>bar</span>


            The HtmlAgilityPack only allows one top-level node to be returned. You can hardcode the return value for HighlightWords to test.



            Also, this post has run across the same problem.






            share|improve this answer























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              2 Answers
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              2 Answers
              2






              active

              oldest

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              active

              oldest

              votes






              active

              oldest

              votes









              0














              The problem is that HtmlTextNode.CreateNode can only create one node. When you add a <span> inside, that's another node, and CreateNode throws the exception you see.



              Make sure that you are only doing a search and replace on the lowest leaf nodes (nodes with no children). Then rebuild that node by:



              1. Create a new empty node to replace the old one

              2. Search for the text in .InnerText

              3. Use HtmlTextNode.Create to add the plain text before the text you want to highlight

              4. Then add your new <span> with the highlighted text with HtmlNode.CreateNode

              5. Then search for the next occurrence (start back at 1) until no more occurrences are found.





              share|improve this answer



























                0














                The problem is that HtmlTextNode.CreateNode can only create one node. When you add a <span> inside, that's another node, and CreateNode throws the exception you see.



                Make sure that you are only doing a search and replace on the lowest leaf nodes (nodes with no children). Then rebuild that node by:



                1. Create a new empty node to replace the old one

                2. Search for the text in .InnerText

                3. Use HtmlTextNode.Create to add the plain text before the text you want to highlight

                4. Then add your new <span> with the highlighted text with HtmlNode.CreateNode

                5. Then search for the next occurrence (start back at 1) until no more occurrences are found.





                share|improve this answer

























                  0












                  0








                  0







                  The problem is that HtmlTextNode.CreateNode can only create one node. When you add a <span> inside, that's another node, and CreateNode throws the exception you see.



                  Make sure that you are only doing a search and replace on the lowest leaf nodes (nodes with no children). Then rebuild that node by:



                  1. Create a new empty node to replace the old one

                  2. Search for the text in .InnerText

                  3. Use HtmlTextNode.Create to add the plain text before the text you want to highlight

                  4. Then add your new <span> with the highlighted text with HtmlNode.CreateNode

                  5. Then search for the next occurrence (start back at 1) until no more occurrences are found.





                  share|improve this answer













                  The problem is that HtmlTextNode.CreateNode can only create one node. When you add a <span> inside, that's another node, and CreateNode throws the exception you see.



                  Make sure that you are only doing a search and replace on the lowest leaf nodes (nodes with no children). Then rebuild that node by:



                  1. Create a new empty node to replace the old one

                  2. Search for the text in .InnerText

                  3. Use HtmlTextNode.Create to add the plain text before the text you want to highlight

                  4. Then add your new <span> with the highlighted text with HtmlNode.CreateNode

                  5. Then search for the next occurrence (start back at 1) until no more occurrences are found.






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 16 '18 at 15:32









                  Gabriel LuciGabriel Luci

                  11.6k11525




                  11.6k11525























                      0














                      Your function HighlightWords must be returning multiple top-level HTML nodes. For example:



                      <p>foo</p>
                      <span>bar</span>


                      The HtmlAgilityPack only allows one top-level node to be returned. You can hardcode the return value for HighlightWords to test.



                      Also, this post has run across the same problem.






                      share|improve this answer



























                        0














                        Your function HighlightWords must be returning multiple top-level HTML nodes. For example:



                        <p>foo</p>
                        <span>bar</span>


                        The HtmlAgilityPack only allows one top-level node to be returned. You can hardcode the return value for HighlightWords to test.



                        Also, this post has run across the same problem.






                        share|improve this answer

























                          0












                          0








                          0







                          Your function HighlightWords must be returning multiple top-level HTML nodes. For example:



                          <p>foo</p>
                          <span>bar</span>


                          The HtmlAgilityPack only allows one top-level node to be returned. You can hardcode the return value for HighlightWords to test.



                          Also, this post has run across the same problem.






                          share|improve this answer













                          Your function HighlightWords must be returning multiple top-level HTML nodes. For example:



                          <p>foo</p>
                          <span>bar</span>


                          The HtmlAgilityPack only allows one top-level node to be returned. You can hardcode the return value for HighlightWords to test.



                          Also, this post has run across the same problem.







                          share|improve this answer












                          share|improve this answer



                          share|improve this answer










                          answered Nov 16 '18 at 15:34









                          Cardi DeMonaco JrCardi DeMonaco Jr

                          6617




                          6617



























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