Question

I am using jstree library to display a tree.

In the code below, I am looping through the selected nodes in the tree and based on some conditions, I am assigning a variable ‘allow_edit’ a boolean value.

I would like to break the main loop if 'allow_edit = false'.

I tried using label and breaking the loop but this does not seem to work. I am getting undefined label.

loop1:
$j.each($j("#demo2").jstree("get_selected"), function(index, element) {

  var selected_node_depth = parseInt($j(element).attr('node_depth'));
  var allow_edit = false;


  var array_first_filter = $j.grep(array_first, function(v) { return v[1]  != "not detected";})
  var array_second_filter = $j.grep(array_first_filter, function(v) { return v[3] > selected_node_depth;})


  if (array_second_filter.length === 0 || array_second_filter.length == null)
  {
    allow_edit = true;
  }
  else{
    alert("Confliction exists in your selected terms.");
    allow_edit = false;
    //break loop1; /** not working, getting undefined label **/
  }


}

Any suggestions on how to break the main loop if 'allow_edit = false'? Thanks a lot

Answer 1

If the function you pass to .each() returns false, the iteration will stop.

else {
  allow_edit = false; // pointless since you're about to return ...
  return false;
}

Also, as a programming style note, any construction of the form:

if (something) {
  flag = true;
}
else {
  flag = false;
}

can be better written as simply:

flag = something;

In JavaScript, to force flag to be boolean (true or false), you can do this:

flag = !!(something);

The two ! (logical “not”) operators force the expression (“something”) to be evaluated as a boolean by the same rules as are used when that expression is the test clause of an if statement.