Can I acquire URL loading in cc.webiview?(iOS & android)

I use cc.webview in My App.
I thought whether I acquire a page URL(in cc.webview) loading now.
I implemented the following sources.

First of all ,URL was displayed in「webview_data」.
URL of the default value that I filled in cocoscreator.

However,When I tap Webview page(in CC.webview), and move to the different page, I can’t find new URL in 「webview_data」.

Can I acquire a URL when I move in Webview page?

Is there the solution?


cc.Class({
    extends: cc.Component,

    properties: {

        webview: cc.WebView,

    },

    start () {

        this.webview.node.on('loading', this.callback, this);

    },

    callback: function (event) {
        var webview_data = event;

        var seen = []; 

        var replacer = function(key, value) {
            if (value != null && typeof value == "object") {
                if (seen.indexOf(value) >= 0) {
                return;
                }
                seen.push(value);
            }
            return value;
            };
            
        console.log(JSON.stringify(webview_data, replacer));
        
        //there is no new URL in webview_data (I can only default pageURL)

    },


});