gradient radial to linear bach change

Hi @Max Mugen, I had already written this when I saw you already had a virtually equivalent answer. I will post it anyway, because a small difference is I gave it a UI, so you can choose which conversion to make. - Mark

/**
 * Convert Gradient FillColor Type.
 * @discussion https://community.adobe.com/t5/illustrator-discussions/gradient-radial-to-linear-bach-change/m-p/13474116
 */
(function () {

    var doc = app.activeDocument,
        items = doc.selection;

    var convertToGradType = ui()
        ? GradientType.LINEAR
        : GradientType.RADIAL;

    for (var i = 0; i < items.length; i++) {

        var item = items[i];

        if (
            item.fillColor.typename == 'GradientColor'
            && item.fillColor.gradient.type != convertToGradType
        )
            item.fillColor.gradient = newGradFromGrad(doc, item.fillColor.gradient, convertToGradType);

    }


    function newGradFromGrad(doc, grad, convertToType) {

        if (grad.gradType === convertToType)
            return grad;

        var newGrad = doc.gradients.add();

        newGrad.type = convertToType;
        newGrad.stops = grad.stops;

        while (newGrad.gradientStops.length < grad.gradientStops.length)
            newGrad.gradientStops.add();

        for (var i = 0; i < grad.gradientStops.length; i++) {
            newGrad.gradientStops[i].color = grad.gradientStops[i].color;
            newGrad.gradientStops[i].midPoint = grad.gradientStops[i].midPoint;
            newGrad.gradientStops[i].opacity = grad.gradientStops[i].opacity;
            newGrad.gradientStops[i].rampPoint = grad.gradientStops[i].rampPoint;
        }

        return newGrad;

    };

    function ui() {

        var w = new Window("dialog { text:'', properties:{ resizeable:true } }");
        w.add('statictext',undefined,'Convert selected gradients to:');
        var radios = w.add("group {orientation:'row', alignment:['center','center']}");
        var linearRadio = radios.add('radiobutton', undefined, 'Linear');
        var radialRadio = radios.add('radiobutton', undefined, 'Radial');
        radialRadio.value = true;
        var buttons = w.add("group {orientation:'row', alignment:['right','center'], alignChildren:'right', margins:[0,23,0,0] }");
        var cancelButton = buttons.add("Button { text:'Cancel', properties:{name:'cancel'} }");
        var okButton = buttons.add("Button { text:'Convert' }");
        okButton.onClick = function () { w.close(1) };

        w.center();
        var result = w.show();

        if (result == 1)
            return linearRadio.value;

    }


})();