CODEWITHSUNDEEP
javascriptjavajqueryspring-mvcdatatables
QuestionMarks
QuestionMarks

Reputation: 246

How to iterate through selected HTML table rows and retrieve data from each row

I am displaying a list of data selected from an Oracle database on a jsp using Spring MVC.

The code for displaying the data in a table is as follows (using datatables plugin):

$("#addLocationsTable").DataTable({
  "bProcessing" : false, "bServerSide" : false, "responsive" : true, "sort" : "position", "oLanguage" :
  {
    "sEmptyTable" : "There were no matches found for the search. Try again with different criteria. "
  },
  "sAjaxSource" : "addLocations.htm",
  "responsive": "true",
  "order": [[0, "asc"]],
  aLengthMenu: [
    [25, 50, 100, 200, -1],
    [25, 50, 100, 200, "All"]
  ],
  iDisplayLength: -1,
  "scrollY":        "200px",
  "scrollCollapse": true,
  "paging":         false,

  "sAjaxDataProp" : "locationData", "bDestroy" : true,
  "aoColumns" :
    [
      {"mData" : "id"},
      {"mData" : "id"}
    ],
  'columnDefs' : [{
    'targets' : 0,
    'searchable':false,
    'orderable':false,
    'className': 'dt-body-center',
    'render': function (data, type, full, meta){
      return '<input type="checkbox" name="selectedID" value="' + $('<div/>').text(data).html() + '">';
    }
  }]
});

This works to assign a checkbox to each row, and assigns the checkbox with the value of the id. In my controller, I am able to test with the following code, which returns the value of the first selected checkbox:

@RequestMapping(params="saveLocations", method = RequestMethod.POST)
public String saveLocations(HttpServletRequest req){
    System.out.println(req.getParameter("selectedID"));
    return "redirect:/locations.htm";
}

On the jsp, this submit is handled using a basic submit button:

<button type="submit" class="btn btn-primary" id="saveLocations" name="saveLocations">Save</button>

What I am trying to do is retrieve each selected row in the table. I know that I have to loop through the values somehow, but I'm not really sure how to do that.

ANSWER: When returning multiple values, you need to use getParameterValues(). So the new controller looks like this:

    String[] values = req.getParameterValues("selectedID");
    for(int i=0;i<values.length;i++)
    {
    System.out.println(values[i]);
    }

Upvotes: 3

Views: 1684

Answers (1)

Gyrocode.com
Gyrocode.com

Reputation: 58890

SOLUTION

You can use the snippet below, where frm-example is ID of your form.

It will iterate over all checkboxes in the table and add those not present in DOM as <input type="hidden"> elements.

// Handle form submission event
$('#frm-example').on('submit', function(e){
   var form = this;

   // Iterate over all checkboxes in the table
   table.$('input[type="checkbox"]').each(function(){
      // If checkbox doesn't exist in DOM
      if(!$.contains(document, this)){
         // If checkbox is checked
         if(this.checked){
            // Create a hidden element 
            $(form).append(
               $('<input>')
                  .attr('type', 'hidden')
                  .attr('name', this.name)
                  .val(this.value)
            );
         }
      } 
   });
});

I'm not Java expert but it looks like you need to use getParameterValues() on the server-side instead of getParameter(). According to the manual getParameter() should be used when there is only one value.

DEMO

See jQuery DataTables: How to submit all pages form data for more details and demonstration.

Upvotes: 2

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