Apply Type validation on Sharepoint list columns

Question

I have a dropdown list having list of all the columns present in a Sharepoint xyz list. Below is my code.

function getColumnname() 
{ 

var _fields = ''; 
var lEnum = fields.getEnumerator(); 
var fieldxList = document.getElementById('ddlxField');
$('#ddlxField').find('option:gt(0)').remove();


while(lEnum.moveNext()) 

{ 
    _fields = lEnum.get_current().get_title();
    var newListItem = document.createElement('OPTION'); 
    var box = _fields;
    newListItem.text = box;
    newListItem.value = box;
    fieldxList.add(newListItem);
    box.value = "";
 } 

 } 
<div>
 <select id="ddlxField"></select></div>

Now, what I want is to apply validation on this dropdown , so that user can choose only those column , whose type="Single line of text", if he chooses column name of some other type , it should prompt. Is that possible?

Answer 1

It should be achievable by adding the onchange event handler for your dropdownlist.

You will have to save the field title to column type mapping in an array/object, and refer it in your validation logic.