How to overload a JavaScript function? (changing Slickgrid's editor)

Question

I'm using Slickgrid and I would like to change behavior of editor. Instead of copy&paste I tried to overload one of functions but it doesn't work. I cannot read loadValue function.

loadValue is defined as (some code omitted)

    IntegerCellEditor : function(args) {
        this.loadValue = function(item) {
            defaultValue = item[args.column.field];
            $input.val(defaultValue);
            $input[0].defaultValue = defaultValue;
            $input.select();
        };
    }

What I tried is:

    function tristateIntegerCellEditor(check_field) { 
        var f = IntegerCellEditor;
        var f_loadValue = f.loadValue;

        f.loadValue = function(item) {
            f_loadValue(item);

            if (check_field) {
                if (!item[check_field]) {
                    $select.disable();
                }
            }
        };

        return f;
    }

Is there any way to substitute my function?

Community · Accepted Answer · 2017-05-23 11:47:50Z

2

You need f_loadValue.call(this, item);

Otherwise the old loadValue get's called with it's context (this) as window (the default).

Related:

edited May 23, 2017 at 11:47

CommunityBot

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answered Jul 21, 2011 at 11:17

Raynos

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1 Comment

pma_ Over a year ago

Problem is that result of f.loadValue is undefined, how to get function?

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