Value is Getting Null on Selecting Value from OptionSet

Hello Expert, I am Loading some value to an optionset on PageLoad. But when i am selecting an item the value is getting null in OptionSet What is the reason. Here is my code Below. Please suggest where i am wrong

var options = new Array();
Function LoadData()
{
         var entityField = Xrm.Page.data.entity.attributes.get("new_entitynamefield");
          var controls = entityField.controls.get();
          for (var i = 0; i < entityMetadataCollection.length; i++) {

              var entity = entityMetadataCollection[i];
              var optn = new Option();
              optn.text = entity.LogicalName;
              optn.value = i + 1;
              controls[0].addOption(optn, i + 1);             
              options[i] = entity.LogicalName; 
          }
}

function selectData()
{
 var entityLogicalName = $("#new_entitynamefield option:selected");

    
          for (i = 0; i < options.length; i++) {
             
              if (options[i] == entityLogicalName.text()) {                  
                  Xrm.Page.getAttribute("new_entitynamefield").setValue(options[i]);
              }
          }
         
      

}

Thank you

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saroj