Home / Questions / 194965
Accepted
angelo1793
Asked: 2020-09-08 08:51:58 +0800 CST 2020-09-08 08:51:58 +0800 CST

Call js file containing java variable, from html5

  • 772

I have a JS function embedded in my web page, at the end of body

<script>
function permisosMenu() {
  var cadena = <%=permisos%>
  if(!cadena.includes(1) && !cadena.includes(2) && !cadena.includes(3) && !cadena.includes(4))
        document.getElementById("bloque1").style.display ="none";

  if(!cadena.includes(5) && !cadena.includes(6) && !cadena.includes(7) && !cadena.includes(8) &&
          !cadena.includes(9) && !cadena.includes(10) && !cadena.includes(11) && !cadena.includes(12) &&
          !cadena.includes(13) && !cadena.includes(14) && !cadena.includes(15) && !cadena.includes(16))
        document.getElementById("bloque2").style.display ="none";

  if(!cadena.includes(6) && !cadena.includes(7) && !cadena.includes(8) && !cadena.includes(9) 
          && !cadena.includes(10) && !cadena.includes(11) && !cadena.includes(12))
        document.getElementById("bloque2_op2").style.display ="none";

  if(!cadena.includes(17) && !cadena.includes(18) && !cadena.includes(19) && !cadena.includes(20) )
        document.getElementById("bloque3").style.display ="none";

  if(!cadena.includes(21) && !cadena.includes(22) && !cadena.includes(23))
        document.getElementById("bloque4").style.display ="none";

  if(!cadena.includes(24) && !cadena.includes(25))
        document.getElementById("bloque5").style.display ="none";

  for (var i = 1; i <= 32; i++) {
      if(!cadena.includes(i)){
        document.getElementById("op"+i).style.display ="none";
    }
}
}
</script>

This code meets what I need, the string variable will get its value from <%=permissions%> (which is found at the beginning of the document before the body)

<%
String permisos= (String)session.getAttribute("permisos");
%>

When it is directly placed in the html it works correctly, when I want to put it in a separate .js file, to later call it with

<script source="ruta.."></script>

It doesn't work for me, perhaps the scriptest <%=permissions> is what doesn't allow calling it in my html ?

javascript

1 Answers

  1. Best Answer

    That's right, the js file will be included in the browser (leaving the java server environment) so you could not take java functions out of the jsp context, what I recommend is to save your permissions in a hidden input and read it from javascript , or simply make an ajax call to a jsp that returns a json with whatever permissions you have.

    leaving something like this in the body

    <input id="permisos" type="hidden" value="<%=permisos%>">

    and in Javascript using jquery

    var cadena = $('#permisos').val();
    • 0