[l30]

Вот код который обрабатывает добавление

function addField() {

       countOfFields++;

       curFieldNameId++;

       var div = document.createElement("tr");
       

       div.innerHTML = "<td><input name=\"str[" + curFieldNameId + "]\" type=\"number\" value=\"" + curFieldNameId + "\" style=\"width: 50px; border:0px;\" readonly>&nbsp;&nbsp;</td><td><input style=\"width:450px;\" type=\"text\" class=\"form-control\" id=\"name\" name=\"name[" + curFieldNameId + "]\" required></td><td><input style=\"width:100px;\" type=\"number\" onkeyup=\"this.value = this.value.replace(/[^\\d]/g,'');\" class=\"form-control num\" id=\"num\" name=\"num[" + curFieldNameId + "]\" required></td><td><input style=\"width:200px;\" type=\"text\" class=\"form-control price\" id=\"price\" onkeyup=\"this.value = this.value.replace(/[^\\-?\\d+(\\.\\d{0,})?]/g,'');\" name=\"price[" + curFieldNameId + "]\" required></td><td><input type=\"text\" class=\"form-control sum\" id=\"sum\" name=\"sum[" + curFieldNameId + "]\" readonly></td><td><a class=\"deleteRow\" href=\"#\"><font color=\"red\">[-]</font></a></td>";

       document.getElementById("parentId").appendChild(div);

   return false;
  }

Вот кнопка

<a onclick="return addField()" href="#" >+</a>