Handling Ajax response in datatable

Question

Handling Ajax response in datatable

While working on a project that involves integrating DataTables and Excel files, I encountered the challenge of uploading an Excel file and displaying its contents using DataTables. Despite my search for a JavaScript library that could parse the Excel file and seamlessly integrate it with DataTables, I found no suitable solution. The only viable option seemed to be sending the data to the front-end server using Struts/Java, processing it, and then returning it as JSON. I wonder if there is a way for DataTables to wait for the JSON data via Ajax without explicitly making a request.

java javascript ajax json datatables

Answer 1

Answer №1

In my opinion, accomplishing this task is feasible using HTML5 and JavaScript. To test it out, just execute the following code:

<html>
</head>
<script>
  function readBlob() {

    var files = document.getElementById('files').files;

    if (!files.length) {
      alert('Please select a file!');
      return;
    }

    var file = files[0];
    var start = 0;
    var stop = file.size;

    var reader = new FileReader();

    // If we use onloadend, we need to check the readyState.
    reader.onloadend = function(evt) {
      if (evt.target.readyState == FileReader.DONE) { // DONE == 2
        document.getElementById('byte_content').textContent = evt.target.result;
      }
    };

    var blob = file.slice(start, stop);
    reader.readAsBinaryString(blob);
  }

</script> 
</head>

<body>
<input type="file" id="files" name="file" accept=".csv"  />
<span class="readBytesButtons">
  <button onclick="readBlob()">entire file</button>
</span>
<div id="byte_range"></div>
<div id="byte_content"></div>
</body>

</html>

With the help of FileReader in JavaScript, extracting Excel data as text is achievable. For displaying the data in a datatable format, your own logic must be applied.

Answer 2

In my opinion, accomplishing this task is feasible using HTML5 and JavaScript. To test it out, just execute the following code:

<html>
</head>
<script>
  function readBlob() {

    var files = document.getElementById('files').files;

    if (!files.length) {
      alert('Please select a file!');
      return;
    }

    var file = files[0];
    var start = 0;
    var stop = file.size;

    var reader = new FileReader();

    // If we use onloadend, we need to check the readyState.
    reader.onloadend = function(evt) {
      if (evt.target.readyState == FileReader.DONE) { // DONE == 2
        document.getElementById('byte_content').textContent = evt.target.result;
      }
    };

    var blob = file.slice(start, stop);
    reader.readAsBinaryString(blob);
  }

</script> 
</head>

<body>
<input type="file" id="files" name="file" accept=".csv"  />
<span class="readBytesButtons">
  <button onclick="readBlob()">entire file</button>
</span>
<div id="byte_range"></div>
<div id="byte_content"></div>
</body>

</html>

With the help of FileReader in JavaScript, extracting Excel data as text is achievable. For displaying the data in a datatable format, your own logic must be applied.

Answer 3

Answer №2

Sure, absolutely!

Perhaps you're interested in attempting something along these lines:

Start by uploading the file to the server
- In your Struts action, read the Excel file, save it temporarily on the disk, and return the file name to your JSP.
Once the first step is completed, initiate an Ajax call to the Struts action
- Pass the file name as a parameter in the Datatable Ajax call
- Retrieve the file from the disk, read it, and populate a Pojo or VO object with the data
- Generate JSON from the Pojo using Gson or Jackson API
- Finally, return the JSON response

To delve deeper into this topic, check out this resource on Datatable AJAX sourcing

Answer 4

Sure, absolutely!

Perhaps you're interested in attempting something along these lines:

Start by uploading the file to the server
- In your Struts action, read the Excel file, save it temporarily on the disk, and return the file name to your JSP.
Once the first step is completed, initiate an Ajax call to the Struts action
- Pass the file name as a parameter in the Datatable Ajax call
- Retrieve the file from the disk, read it, and populate a Pojo or VO object with the data
- Generate JSON from the Pojo using Gson or Jackson API
- Finally, return the JSON response

To delve deeper into this topic, check out this resource on Datatable AJAX sourcing

Answer 5

Answer №3

Achieving this task is entirely feasible without the need for Ajax in your specific scenario. How can you accomplish it? Take a look at the steps below:

Start by setting up a form to upload the excel file to my struts framework. Proceed to process the excel file and display the contents in clean HTML/table structure. Finally, initialize a basic datatables setup upon page load to complete the process!

UPDATE

If you require pagination, consider utilizing datatables with Ajax capabilities as outlined below:

var oTable = "";
$(document).ready(function() {
  oTable = $('#htmltableID').dataTable({
    "sPaginationType": "full_numbers",
    "bServerSide": true,
    "sAjaxSource": "/myAjaxSource.jsp?page="+pageNumber+",
    "sServerMethod": "POST",
    "iDisplayLength": 50
  });
}

Within your myAjaxSource.jsp file, retrieve the page parameter sent via the ajax URL and provide the corresponding data (in JSON format)

Answer 6

Achieving this task is entirely feasible without the need for Ajax in your specific scenario. How can you accomplish it? Take a look at the steps below:

Start by setting up a form to upload the excel file to my struts framework. Proceed to process the excel file and display the contents in clean HTML/table structure. Finally, initialize a basic datatables setup upon page load to complete the process!

UPDATE

If you require pagination, consider utilizing datatables with Ajax capabilities as outlined below:

var oTable = "";
$(document).ready(function() {
  oTable = $('#htmltableID').dataTable({
    "sPaginationType": "full_numbers",
    "bServerSide": true,
    "sAjaxSource": "/myAjaxSource.jsp?page="+pageNumber+",
    "sServerMethod": "POST",
    "iDisplayLength": 50
  });
}

Within your myAjaxSource.jsp file, retrieve the page parameter sent via the ajax URL and provide the corresponding data (in JSON format)

Handling Ajax response in datatable

Answer №1

Answer №2

Answer №3

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