edx-platform/common/static/js/capa/schematicinput.js

$(function() {
    // TODO: someone should fix all of this...
    // $("a[rel*=leanModal]").leanModal(); //TODO: Make this work with the new modal library. Try and integrate this with the "slices"

    /* eslint-disable no-multi-str */
    // xss-lint: disable=javascript-jquery-append
    $('body').append('\
    <div id="circuit_editor_modal" class="modal hide fade"> \
      <div class="modal-body"> \
        <input class="schematic" height="300" width="500" id="schematic_editor" name="schematic" type="hidden" value=""/> \
      </div> \
      <div class="modal-footer"> \
        <button type="button" id="circuit_save_btn" class="btn btn-primary" data-dismiss="modal"> \
          Save circuit \
        </button> \
      </div> \
    </div>');

    // This is the editor that pops up as a modal
    var editorCircuit = $('#schematic_editor').get(0);
    // This is the circuit that they last clicked. The one being edited.
    var editingCircuit = null;
    // Notice we use live, because new circuits can be inserted
    $('.schematic_open').live('click', function() {
        // Find the new editingCircuit. Transfer its contents to the editorCircuit
        editingCircuit = $(this).children('input.schematic').get(0);

        editingCircuit.schematic.update_value();
        var circuit_so_far = $(editingCircuit).val();

        var n = editorCircuit.schematic.components.length;
        for (var i = 0; i < n; i++) { editorCircuit.schematic.components[n - 1 - i].remove(); }

        editorCircuit.schematic.load_schematic(circuit_so_far, '');
        editorCircuit.schematic.zoomall();
    });

    $('#circuit_save_btn').click(function() {
        // Take the circuit from the editor and put it back into editingCircuit
        editorCircuit.schematic.update_value();
        var saving_circuit = $(editorCircuit).val();

        var n = editingCircuit.schematic.components.length;
        for (var i = 0; i < n; i++) { editingCircuit.schematic.components[n - 1 - i].remove(); }

        editingCircuit.schematic.load_schematic(saving_circuit, '');
        editingCircuit.schematic.zoomall();
    });
});