{"id":3503,"date":"2019-03-25T17:44:36","date_gmt":"2019-03-25T20:44:36","guid":{"rendered":"http:\/\/xexeu.elipse.com.br\/pt\/connecting-an-html-page-to-an-e3server-with-communication-library-e3dataaccess-using-javascript-and-vbscript\/"},"modified":"2022-03-29T10:09:15","modified_gmt":"2022-03-29T13:09:15","slug":"connecting-an-html-page-to-an-e3server-with-communication-library-e3dataaccess-using-javascript-and-vbscript","status":"publish","type":"post","link":"https:\/\/kb.elipse.com.br\/en\/connecting-an-html-page-to-an-e3server-with-communication-library-e3dataaccess-using-javascript-and-vbscript\/","title":{"rendered":"Connecting an HTML page to an E3Server with communication library E3DataAccess using JavaScript and VBScript."},"content":{"rendered":"
\n

GENERAL NOTES:
\n<\/strong><\/u><\/p>\n

    \n
  1. This article applies to Elipse E3<\/strong>, versions 4.5<\/strong> or higher.<\/li>\n
  2. For further details on E3DataAccess library, we recommend reading the following articles: Connecting a VBA application to an E3Server using the E3DataAccess library<\/strong><\/a> and BUG-0013588: Incompatible types when calling E3DataAccess’ GetValue\/SetValue methods<\/strong><\/a>.<\/strong><\/li>\n<\/ol>\n

    Introduction<\/strong><\/u><\/p>\n

    This article uses JavaScript and VBScript languages to demonstrate how to use E3DataAccess <\/b>library. In the examples, the scripts were used on an HTML page, and the client is Internet Explorer version 11.<\/p>\n

    Languages such as JavaScript offer no support to passing parameters as reference, and that is why JavaScript was used alongside VBScript to use a few methods of E3DataAccess library.<\/p>\n

    Internet Explorer version 11 or higher offer unlimited support to VBScript. For further information, access Microsoft’s documentation<\/a>. To allow VBScript to be used, the following excerpt was added to the page:<\/p>\n

    <\/div>\n

    Since JavaScript does not support passing parameters as reference, the E3Item <\/i>class was created in VBScript to use ReadValue <\/i>and WriteValue <\/i>methods. This class has two functions: Read(ItemName)<\/i>, which receives as parameter the server tag’s name and then uses ReadValue <\/i>function\u00a0 to read this tag; and Write(ItemName, vTimestamp, vQuality, vValue)<\/i>, which receives as parameter the name of the server tag where the other parameters Timestamp<\/i>, Quality <\/i>and Value <\/i>will be saved, and writes this data in the server via WriteValue <\/i>function.<\/p>\n

    Class E3Item<\/span>\r\n\u00a0\u00a0\u00a0 Public Value <\/span>\r\n\u00a0\u00a0\u00a0 Public Timestamp<\/span>\r\n\u00a0\u00a0\u00a0 Public Quality<\/span>\r\n\u00a0<\/span>\r\n\u00a0\u00a0\u00a0 Public Function Read(ItemName)<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Read = E3DataAccess.ReadValue(ItemName, Timestamp, Quality, Value) <\/span>\r\n\u00a0\u00a0\u00a0 End Function<\/span>\r\n\u00a0<\/span>\r\n\u00a0\u00a0\u00a0 Public Function Write(ItemName, vTimestamp, vQuality, vValue)<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Write = E3DataAccess.WriteValue(ItemName, vTimestamp, vQuality, vValue) <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 If Write Then<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Timestamp = vTimestamp<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Quality = vQuality <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Value = vValue <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 End If <\/span>\r\n\u00a0\u00a0\u00a0 End Function <\/span>\r\nEnd Class<\/span><\/pre>\n
    E3DataAccess Library Methods<\/b><\/u><\/p>\n
    1. ReadValue <\/i>method<\/b><\/p>\n
    To read data, we’ve created Read()<\/i> function in JavaScript:<\/p>\n
    function Read()\r\n{\r\n   E3DataAccess.Server = document.E3Config.editServer.value;\r\n   var msg;\r\n   \/\/Cria instancia var da = createNewE3Item();\r\n   if (da.Read(document.E3Config.editTag.value))\r\n   {\r\n      document.E3Config.editValue.value = da.Value;\r\n      msg = document.E3Config.editTag.value + \": \" + da.Timestamp + \", \" + da.Quality + \", \" + da.Value;\r\n   }\r\n   else\r\n   {\r\n      msg = \"Error in reading value from server: \" + E3DataAccess.Server + \" for item: \" + document.E3Config.editTag.value; } WriteText(msg);\r\n   }\r\n   WriteText(msg);\r\n}<\/pre>\n
    This function creates an instance of E3Item <\/i>class, sends the name of the tag set up by the user in the HTML file to the class’ Read <\/i>function, and then connects to E3Server, reading Value<\/i>, TimeStamp <\/i>and Quality<\/i> parameters via E3DataAccess’ ReadValue method. Having done that, the values are ready to be used in JavaScript and become available to the user.<\/p>\n
    2. WriteValue <\/i>method<\/b><\/p>\n
    Similarly to the read procedure, to write data you will use Write <\/i>function, created in JavaScript:<\/p>\n
    function Write() <\/span>\r\n{ <\/span>\r\n\u00a0\u00a0\u00a0 E3DataAccess.Server = document.E3Config.editServer.value;<\/span>\r\n\u00a0\u00a0\u00a0 var msg; <\/span>\r\n\u00a0\u00a0\u00a0 \/\/Cria instancia<\/span>\r\n\u00a0\u00a0\u00a0 var da = createNewE3Item();<\/span>\r\n\u00a0\u00a0\u00a0 \/\/Formata data para salvar<\/span>\r\n\u00a0\u00a0\u00a0 var date = new Date(); <\/span>\r\n\u00a0\u00a0\u00a0 var month = date.getMonth()+ 1; var dateString = month + \"\/\" + date.getDate() + \"\/\" <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 + date.getFullYear() + \" \" + date.getHours() + \":\" + date.getMinutes() + \":\" + date.getSeconds(); <\/span>\r\n\u00a0\u00a0\u00a0 if (da.Write(document.E3Config.editTag.value, dateString, 192,document.E3Config.editValue.value))<\/span>\r\n\u00a0\u00a0\u00a0 {<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 msg = \"Writing to server: '\" + E3DataAccess.Server + \"' for item: '\" + document.E3Config.editTag.value + \"' succeeded\"; <\/span>\r\n\u00a0\u00a0\u00a0 }<\/span>\r\n\u00a0\u00a0\u00a0 else<\/span>\r\n\u00a0\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 msg = \"Error in writing value to server: '\" + E3DataAccess.Server + \"' for item: '\" + document.E3Config.editTag.value + \"' = \" <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 + document.E3Config.editValue.value; <\/span>\r\n\u00a0\u00a0\u00a0 }<\/span>\r\n\u00a0\u00a0\u00a0 WriteText(msg); <\/span>\r\n}<\/span><\/pre>\n
    This function also creates an instance of E3Item <\/i>class, passes the informed parameters by the user to to the class’ Write <\/i>function, and uses E3DataAccess’ WriteValue <\/i>method to write in the tag, thus passing all parameters to E3Server.
    \n
    \n3. ExecuteQuery <\/i>method<\/b><\/p>\n
    You can also create queries via E3DataAccess’ ExecuteQuery <\/i>method. To do so, we’ve created GetQueryValues()<\/i> function in JavaScript:<\/p>\n
    function GetQueryValues() <\/span>\r\n{ <\/span>\r\n\u00a0\u00a0\u00a0 E3DataAccess.Server = document.E3Config.editServer.value; <\/span>\r\n\u00a0\u00a0\u00a0 var da = createNewE3Query(); <\/span>\r\n\u00a0\u00a0\u00a0 if (document.E3Config.editQuery.value != \"\")<\/span>\r\n\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 da.ProcessQuery(document.E3Config.editQuery.value, \"dvTableRended\"); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 document.getElementById(\"dvTableRended\").innerHTML = da.Content; <\/span>\r\n\u00a0\u00a0\u00a0 } <\/span>\r\n\u00a0\u00a0\u00a0 else<\/span>\r\n\u00a0\u00a0\u00a0 {<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 document.getElementById(\"dvTableRended\").innerHTML = Date() + \" - Error empty query.\"; <\/span>\r\n\u00a0\u00a0\u00a0 }<\/span>\r\n}<\/span><\/pre>\n
    This function creates an instance of E3Query class, created in VBScript according to the example above, using ProcessQuery function. Through this other function, it will use the library’s ExecuteQuery method to query in E3Server.<\/p>\n
    Class E3Query <\/span>\r\n\u00a0\u00a0\u00a0 Public Content <\/span>\r\n\u00a0\u00a0\u00a0 <\/span>\r\n\u00a0\u00a0\u00a0 Public Function ProcessQuery(queryName, tablePlacement) <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 If queryName <> \"\" Then <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Dim vNames, vValues, arrResult <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 If E3DataAccess.ExecuteQuery(queryName, vNames, vValues, arrResult) Then <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Call RenderTable(arrResult, tablePlacement) <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Else <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Document.getElementById(tablePlacement).innerHTML = Now & \" - Error in the query result.\"<\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 End If <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Else <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Document.getElementById(tablePlacement).innerHTML = Now & \" - Error empty query.\" <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 End If <\/span>\r\nEnd Function<\/span><\/pre>\n
    4. RegisterCallBack <\/i>and UnregisterCallBack <\/i>methods<\/b><\/p>\n
    To use these methods, we’ve created RegisterCallback()<\/i> function in JavaScript. Unlike the functions previously mentioned here, this function doesn’t need to call any methods developed in VBScript, using the library’s RegisterCallBack<\/i> method directly via JavaScript.
    \n
    \n<\/span><\/p>\n
    \u00a0function RegisterCallback() <\/span>\r\n{ <\/span>\r\n\u00a0\u00a0\u00a0 E3DataAccess.Server = document.E3Config.editServer.value;<\/span>\r\n\u00a0\u00a0\u00a0 if (document.E3Config.editTag.value != \"\") <\/span>\r\n\u00a0\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 var result; <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result = E3DataAccess.RegisterCallback(document.E3Config.editTag.value); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 WriteText(\"Register tag: \" + document.E3Config.editTag.value + \" result: \" + result); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 } <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 else<\/span>\r\n\u00a0\u00a0\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 window.alert(\"Error! There is no tag item for register. Type one before proceed.\"); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 }<\/span><\/pre>\n
    And like RegisterCallback <\/i>method, we’ve also created UnregisterCallback <\/i>function in JavaScript, as seen below.<\/p>\n
    \u00a0function UnregisterCallback() <\/span>\r\n{ <\/span>\r\n\u00a0\u00a0\u00a0 if (document.E3Config.editTag.value != \"\")\u00a0\u00a0\u00a0 if (document.E3Config.editTag.value != \"\") <\/span>\r\n\u00a0\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 var result; <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 result = E3DataAccess.UnregisterCallback(document.E3Config.editTag.value); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 WriteText(\"Unregister tag: \" + document.E3Config.editTag.value + \" result: \" + result); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 } <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 else<\/span>\r\n\u00a0\u00a0\u00a0\u00a0 { <\/span>\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 window.alert(\"Error! There is no tag item for unregister. Type one before proceed.\"); <\/span>\r\n\u00a0\u00a0\u00a0\u00a0 }<\/span>\r\n\u00a0}<\/span><\/pre>\n
    Testing the Application<\/b><\/u><\/p>\n
    To test the application, you must first execute the domain with the E3 application, open the HTML page in Internet Explorer (as an Administrator), and grant access to ActiveX.<\/p>\n
    Having done that, go to the open HTML page and just inform the path of the E3Server tag you wish to read\/write, as seen below.<\/p>\n
    \"\"
    \nFigure 1<\/b>. Reading the server tag<\/span><\/div>\n
    To perform a query, just insert (in Session Query<\/b>) its path in the server, according to the figure below.<\/p>\n
    \"\"
    \nFigure 2<\/b>. Querying the server<\/span><\/div>\n
    Finally, to use RegisterCallBack <\/i>and UnregisterCallBack <\/i>methods, just inser the tag’s path in the server and click Register <\/b>or Unregister<\/b>; therefore, whenever there is an event with this tag, it will be displayed on the screen, as seen below.<\/p>\n
    \"\"
    \nFigure 3<\/b>. RegisterCallBack in server Tag2. (10)<\/span><\/div>\n
    For further details in the implementation, the E3 demo application and the HTML page used are attached to this article.<\/p>\n
    Attachments:<\/h3>\n
    AppE3_HTML.zip<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
    GENERAL NOTES: This article applies to Elipse E3, versions 4.5 or higher. For further details on E3DataAccess library, we recommend reading the following articles: Connecting a VBA application to an…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0},"categories":[826],"tags":[],"yoast_head":"\nConnecting an HTML page to an E3Server with communication library E3DataAccess using JavaScript and VBScript. - Elipse Knowledgebase<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kb.elipse.com.br\/en\/connecting-an-html-page-to-an-e3server-with-communication-library-e3dataaccess-using-javascript-and-vbscript\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Connecting an HTML page to an E3Server with communication library E3DataAccess using JavaScript and VBScript.\" \/>\n<meta property=\"og:description\" content=\"GENERAL NOTES: This article applies to Elipse E3, versions 4.5 or higher. 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