Javascript auto generate unique id for textbox -

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in javascript got problem in create unique auto generate id in textbox. textbox must readonly. please help. id should pt1

<tr>     <td>patient admissionid:</td>     <td><input type="text" readonl  placeholder="patient id"/></td> </tr> 

<div class="input-container">   <input type="text" id="pt1"> </div>  <button id="addinput">add input</button>$('#addinput').on('click',function(){     var inputcount = $(".input-container").find($("input"));         var uniqueinput = "pt"+inputcount.length + 1;     $(".input-container").append("<input type='text' id='" +uniqueinput+ "'>"); })

working fiddle https://jsfiddle.net/wx38rz5l/657/


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