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Treeview with dynamic data source

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146035 Jul 17,2019 02:22 PM UTC Jul 29,2019 10:51 AM UTC Angular - EJ 2 6
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Tags: Treeview
Shaurya Singh
Asked On July 17, 2019 02:22 PM UTC

I am trying to create a tree-view in an Angular 7 application with XML data source. I am successfully able to create the example to create a tree-view with static json with ID, name and subchild. I want a user input of both JSON and XML where I will not have the id, namee or subchild. Is there a way or example to populate this treeview dynamically?

Christopher Issac Sunder K [Syncfusion]
Replied On July 18, 2019 01:04 PM UTC

Hi Shaurya, 

Greetings from Syncfusion support. 

We have prepared a sample for dynamically bind the XML datasource to the treeview. We used a generic method to convert the unknown structure of XML data to JSON with the required format for TreeView. 
In the below example, we have bound the raw XML data into our EJ2 TreeView by using a generic method (convertTreeData). This method is used to convert raw XML data to required JSON of TreeView by provided the mapping field. 

[HTML] 

<script> 
// pass your raw xml data here 
var encodedStr = '&lt;level3Response&gt;&lt;messages&gt;&lt;messagetext="Syncfusion"&gt;&lt;correlationId&gt;01710231451275401143&lt;/correlationId&gt;&lt;messageId&gt;20171023145-1275401143&lt;/messageId&gt;&lt;responseTime&gt;15ms&lt;/responseTime&gt;&lt;/message&gt;&lt;/messages&gt;&lt;/level3Response&gt;'; 
//define the mapper field to be displayed as text in TreeView 
var mapper = []; 
//it will replace the tag name to custom attribute as TreeView node text 
mapper.push({ TagName: "message", TextField: "text" }); 
convertTreeData(encodedStr, mapper); 
//to convert raw xml to xml text node 
function convertTreeData(encodedStr, mapper) { 
    window.treeData = []; 
    window.id = 1; 
    var parser = new DOMParser; 
    var dom = parser.parseFromString( 
        '<!doctype html><body>' + encodedStr, 
        'text/html'); 
    var decodedString = dom.body.textContent; 
    var XmlData = parser.parseFromString(decodedString, "text/xml"); 
    xmlToJson(XmlData, window.treeData, mapper); 
} 
//to convert xml to json with required format 
function xmlToJson(args, treeData, mapper) { 
    for (var i = 0, length = args.childNodes.length; i < length; i++) { 
        var nodeText = undefined, tag = args.childNodes[i] 
        for (var j = 0; j < mapper.length; j++) { 
            if (mapper[j].TagName == tag.tagName) { 
                nodeText = tag.getAttribute(mapper[j].TextField); 
                break; 
            } 
        } 
        nodeText = (nodeText != undefined) ? nodeText : (tag.nodeType == 1 ? tag.tagName : tag.textContent); 
        var obj = { "NodeId": window.id, "NodeText": nodeText }; 
        treeData.push(obj); 
        window.id++; 
        if (args.hasChildNodes()) { 
            if (obj['Nodechild'] == undefined) { 
                obj['Nodechild'] = []; 
            } 
            xmlToJson(tag, obj['Nodechild'], mapper); 
            if (obj["Nodechild"].length == 0) { 
                delete obj["Nodechild"]; 
            } 
        } 
    } 
} 
</script> 

Sample:  

Please check the sample and let us know if you have any concerns on this. 

Thanks,
Christo 


Shaurya Singh
Replied On July 23, 2019 07:28 PM UTC

Hi Shaurya, 

Greetings from Syncfusion support. 

We have prepared a sample for dynamically bind the XML datasource to the treeview. We used a generic method to convert the unknown structure of XML data to JSON with the required format for TreeView. 
In the below example, we have bound the raw XML data into our EJ2 TreeView by using a generic method (convertTreeData). This method is used to convert raw XML data to required JSON of TreeView by provided the mapping field. 

[HTML] 

<script> 
// pass your raw xml data here 
var encodedStr = '&lt;level3Response&gt;&lt;messages&gt;&lt;messagetext="Syncfusion"&gt;&lt;correlationId&gt;01710231451275401143&lt;/correlationId&gt;&lt;messageId&gt;20171023145-1275401143&lt;/messageId&gt;&lt;responseTime&gt;15ms&lt;/responseTime&gt;&lt;/message&gt;&lt;/messages&gt;&lt;/level3Response&gt;'; 
//define the mapper field to be displayed as text in TreeView 
var mapper = []; 
//it will replace the tag name to custom attribute as TreeView node text 
mapper.push({ TagName: "message", TextField: "text" }); 
convertTreeData(encodedStr, mapper); 
//to convert raw xml to xml text node 
function convertTreeData(encodedStr, mapper) { 
    window.treeData = []; 
    window.id = 1; 
    var parser = new DOMParser; 
    var dom = parser.parseFromString( 
        '<!doctype html><body>' + encodedStr, 
        'text/html'); 
    var decodedString = dom.body.textContent; 
    var XmlData = parser.parseFromString(decodedString, "text/xml"); 
    xmlToJson(XmlData, window.treeData, mapper); 
} 
//to convert xml to json with required format 
function xmlToJson(args, treeData, mapper) { 
    for (var i = 0, length = args.childNodes.length; i < length; i++) { 
        var nodeText = undefined, tag = args.childNodes[i] 
        for (var j = 0; j < mapper.length; j++) { 
            if (mapper[j].TagName == tag.tagName) { 
                nodeText = tag.getAttribute(mapper[j].TextField); 
                break; 
            } 
        } 
        nodeText = (nodeText != undefined) ? nodeText : (tag.nodeType == 1 ? tag.tagName : tag.textContent); 
        var obj = { "NodeId": window.id, "NodeText": nodeText }; 
        treeData.push(obj); 
        window.id++; 
        if (args.hasChildNodes()) { 
            if (obj['Nodechild'] == undefined) { 
                obj['Nodechild'] = []; 
            } 
            xmlToJson(tag, obj['Nodechild'], mapper); 
            if (obj["Nodechild"].length == 0) { 
                delete obj["Nodechild"]; 
            } 
        } 
    } 
} 
</script> 

Sample:  

Please check the sample and let us know if you have any concerns on this. 

Thanks,
Christo 


Hi Chris,

Thanks for your response. I was able to use the given example and create a basic treeview out of a basic xml. For example, the xml I used for which I could create a treeview was the following-

<note>
<to>Tove</to>
<from>Jani</from>
<heading>Reminder</heading>
<body>Don't forget me this weekend!</body>
</note>

This successfully gets converted into treeview-


But when throwing a bigger XML at this, it breaks and gives a parsing error. I have taken time to fix it but I am still stuck and hence me reaching out to you again.

<?xml version="1.0"?>
<catalog>
   <book id="bk101">
      <author>Gambardella, Matthew</author>
      <title>XML Developer's Guide</title>
      <genre>Computer</genre>
      <price>44.95</price>
      <publish_date>2000-10-01</publish_date>
      <description>An in-depth look at creating applications
      with XML.</description>
   </book>
   <book id="bk102">
      <author>Ralls, Kim</author>
      <title>Midnight Rain</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-12-16</publish_date>
      <description>A former architect battles corporate zombies,
      an evil sorceress, and her own childhood to become queen
      of the world.</description>
   </book>
   <book id="bk103">
      <author>Corets, Eva</author>
      <title>Maeve Ascendant</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2000-11-17</publish_date>
      <description>After the collapse of a nanotechnology
      society in England, the young survivors lay the
      foundation for a new society.</description>
   </book>
   <book id="bk104">
      <author>Corets, Eva</author>
      <title>Oberon's Legacy</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2001-03-10</publish_date>
      <description>In post-apocalypse England, the mysterious
      agent known only as Oberon helps to create a new life
      for the inhabitants of London. Sequel to Maeve
      Ascendant.</description>
   </book>
   <book id="bk105">
      <author>Corets, Eva</author>
      <title>The Sundered Grail</title>
      <genre>Fantasy</genre>
      <price>5.95</price>
      <publish_date>2001-09-10</publish_date>
      <description>The two daughters of Maeve, half-sisters,
      battle one another for control of England. Sequel to
      Oberon's Legacy.</description>
   </book>
   <book id="bk106">
      <author>Randall, Cynthia</author>
      <title>Lover Birds</title>
      <genre>Romance</genre>
      <price>4.95</price>
      <publish_date>2000-09-02</publish_date>
      <description>When Carla meets Paul at an ornithology
      conference, tempers fly as feathers get ruffled.</description>
   </book>
   <book id="bk107">
      <author>Thurman, Paula</author>
      <title>Splish Splash</title>
      <genre>Romance</genre>
      <price>4.95</price>
      <publish_date>2000-11-02</publish_date>
      <description>A deep sea diver finds true love twenty
      thousand leagues beneath the sea.</description>
   </book>
   <book id="bk108">
      <author>Knorr, Stefan</author>
      <title>Creepy Crawlies</title>
      <genre>Horror</genre>
      <price>4.95</price>
      <publish_date>2000-12-06</publish_date>
      <description>An anthology of horror stories about roaches,
      centipedes, scorpions  and other insects.</description>
   </book>
   <book id="bk109">
      <author>Kress, Peter</author>
      <title>Paradox Lost</title>
      <genre>Science Fiction</genre>
      <price>6.95</price>
      <publish_date>2000-11-02</publish_date>
      <description>After an inadvertant trip through a Heisenberg
      Uncertainty Device, James Salway discovers the problems
      of being quantum.</description>
   </book>
   <book id="bk110">
      <author>O'Brien, Tim</author>
      <title>Microsoft .NET: The Programming Bible</title>
      <genre>Computer</genre>
      <price>36.95</price>
      <publish_date>2000-12-09</publish_date>
      <description>Microsoft's .NET initiative is explored in
      detail in this deep programmer's reference.</description>
   </book>
   <book id="bk111">
      <author>O'Brien, Tim</author>
      <title>MSXML3: A Comprehensive Guide</title>
      <genre>Computer</genre>
      <price>36.95</price>
      <publish_date>2000-12-01</publish_date>
      <description>The Microsoft MSXML3 parser is covered in
      detail, with attention to XML DOM interfaces, XSLT processing,
      SAX and more.</description>
   </book>
   <book id="bk112">
      <author>Galos, Mike</author>
      <title>Visual Studio 7: A Comprehensive Guide</title>
      <genre>Computer</genre>
      <price>49.95</price>
      <publish_date>2001-04-16</publish_date>
      <description>Microsoft Visual Studio 7 is explored in depth,
      looking at how Visual Basic, Visual C++, C#, and ASP+ are
      integrated into a comprehensive development
      environment.</description>
   </book>
</catalog>

This example breaks and this is the expanded treeview-
--Parsing error--


I have tried other big xmls and they are all breaking in the same manner.

Also, would you be able to provide an example of using a raw json instead of raw xml if its something that is already prepared?

Appreciate all your help here.

Thanks,
Shaurya

Shaurya Singh
Replied On July 23, 2019 07:43 PM UTC

What I can also add is that whenever an XML tag has information along with it, that is when it breaks- <test>Something </test> will work but <test id="1"> Something</test> will not work. Can we cater for this ?

Thanks

Christopher Issac Sunder K [Syncfusion]
Replied On July 25, 2019 11:52 AM UTC

Hi Shaurya, 

We have prepared a sample based on your shared XML file using the inbuilt XML parser in the angular-CLI application.  

Please refer to this: https://www.npmjs.com/package/xml2js 

Here we fetched the XML data using ajax request and parse it as JSON using the inbuilt parser. Please find the corresponding code snippet. 

public onCreate() 
{ 
    var proxy = this; 
    const ajax = new Ajax('http://localhost/xmlData/myFile.xml', 'GET'); 
    ajax.send(); 
    ajax.onSuccess = (data: any) => { 
        var parseString = require('xml2js').parseString; 
        parseString(data, function(err, result) { 
            var dataSource = result.catalog.book; 
            proxy.tree.fields.dataSource = dataSource; 
        }); 
    }; 
} 

Output image: 
Parsed-data: 
 
Rendered-tree 
 


Note: Here we hosted the xml file in local and provided that file path in ajax URL 

Please check the above sample and let us know if you have any concerns. 

Thanks, 
Christo 


Shaurya Singh
Replied On July 26, 2019 06:58 PM UTC

Hey Chris,

hate to say it but the example you sent does not build for me and when compiling it gives me a few core file errors. It is missing some ';'  that I cant get into the file and edit.

Thanks
Shaurya

Ashokkumar Balasubramanian [Syncfusion]
Replied On July 29, 2019 10:51 AM UTC

Hi Shaurya, 
 
Sorry for the inconvenience caused. 
 
We have checked the reported issue and it was due to the rxjs version. We have resolved it by upgrading its version. Please find the modified sample from the below link 
 
 
Kindly check the sample and get back to us if you have any concerns. 
 
Regards, 
Ashokkumar B. 


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