Implement a fresh variable scope for an entity

Utilizing the following script enables jQueryUI's autocomplete to function with xeditable, producing the desired outcome:

$(function(){
        dialog.find('a.car').xEdit('autocomplete',{name:'carName', title:'Car Name', url: '/1.0/cars/', pk: carId, autocomplete: {
            url: "/1.0/cars/",
            params: {term:null, fields:['id','name']}
        }});
    });

    $.fn.xEdit = function(type, options) {
        var common={
            placement: 'right',
            ajaxOptions: {type: "PUT"},
            send: 'always'
            // pk: null, title: null, params: {name: null}, url: null, //Must be passed
        }
        // Different actions will be performed based on "type"
        options.params={name: options.name};
        delete(options.name);
        options.type='text';
        this.editable($.extend({}, common, {value: null}, options))
        .on('shown', function(e, editable) {
            var elem=this;
            var $input=editable.input.$input.val('');
            var $button=$input.parent().next().find('button.editable-submit').css('opacity', 0.3)
            .bind('click.prevent', function() {return false;});
            var autocomplete={
                source: function( request, response ) {
                    options.autocomplete.params.term=request.term;
                    $.getJSON( options.autocomplete.url, options.autocomplete.params, function(json) {
                        var data=[];
                        for (var j = 0; j < json.length; j++) {
                            data.push({id:json[j].id,label:json[j].name});
                        }
                        response(data);
                    });
                },
                minLength: 2,
                position: { my : "left top+20", at: "left bottom" },
                select: function(e, ui) {
                    $input.blur();
                    $button.css('opacity', 1).unbind('click.prevent');
                    editable.option('params', {
                        value: ui.item.id,
                        name: options.params.name
                    });
                }
            };
            if (typeof options.autocomplete.select != "undefined") autocomplete.select=options.autocomplete.select;
            $input.focus(function() {
                $button.css('opacity', 0.3).bind('click.prevent', function() {return false;});
            })
            .autocomplete(autocomplete)
            .autocomplete('widget').click(function() {return false;});
        });
    };
    

I am now attempting to override the select: function(e, ui) {...} and potentially other methods in xedit with a new function defined in options, and have tried the following:

$(function(){
        dialog.find('a.car').xEdit('autocomplete',{name:'carName', title:'Car Name', url: '/1.0/cars/', pk: carId, autocomplete: {
            url: "/1.0/cars/",
            params: {term:null, fields:['id','name']},
            select: function(e, ui) {
                // Implement different functionality
                $input.blur();
                $button.css('opacity', 1).unbind('click.prevent');
                editable.option('params', {
                    value: ui.item.id,
                    name: options.params.name,
                    model: 123
                    }
                );
            }
        }});
    });
    

This approach leads to errors indicating that e, ui, $input, $button, editable, options are all undefined. The issue may stem from defining the new function in a differing variable scope.

Is there a method to define an object within one variable scope and then apply another scope to it?

PS. It is likely that the current approach is not ideal, so any suggestions on a cleaner solution would be appreciated.

Answer №1

Although I am unfamiliar with this xEdit plugin, your issue seems to be related to JavaScript. In the first example provided, the select handler can access those variables because it is bound lexically to the outer function's scope (the handler for the shown event). This concept is known as a closure, where an inner function retains its original context even when called outside of its enclosing function. The link between them remains unbroken.

function A() {
  const favoriteFruit = 'Apple';
  const color = 'Red';

  return function(){
    console.log(`My preferred fruit and color are "${favoriteFruit}" and "${color}" correspondingly`);
  };
}

const B = A();
const C = B;
const D = C;
const E = D;

const myObject = { E };
// Memories of the past cannot be erased... =)
myObject.E(); //=> My preferred fruit and color are "Apple" and "Red" correspondingly

// And then you go ahead and mess with it...
myObject.E = function(){
  console.log(`Actually, I adore "${favoriteFruit}" and the color "${color}".`);
};
// Whoops!
myObject.E(); //=> Uncaught ReferenceError: favoriteFruit is not defined

Declaring a function A outside of another function B prohibits A from accessing any variable declared within B. This seems to be what you are attempting to achieve.

Therefore, altering a function's scope after declaration is not feasible.

For further insights on how closures operate, do check out this exceptional SO thread filled with valuable explanations.

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