Javascript , Object property is shown as undefined

Javascript , Object property is shown as undefined

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Javascript , Object property is shown as undefined
Tag : javascript , By : Skee
Date : November 24 2020, 09:00 AM

will help you I have a json response from a service that looks like: ,
it returns undefined.

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'this' is undefined inside an Object in javascript accessing property of object by another property

Tag : javascript , By : PatrickSimonHenk
Date : March 29 2020, 07:55 AM
it fixes the issue , You can't get this while instantiating. You can do:
Type= {
        Container: $get('ctl00_Main_rbtnlst_Type'),
        Local: function(){return this.Container.getElementsByTagName('input');},
        Foreign: function(){return this.Container.getElementsByTagName('input');}
Type= {
            Container: $get('ctl00_Main_rbtnlst_Type'),
            Local: $get('ctl00_Main_rbtnlst_Type')
            Foreign: $get('ctl00_Main_rbtnlst_Type')
var Type = (function(){
   var container = $get('ctl00_Main_rbtnlst_Type'),
       local = container.getElementsByTagName('input'),
       foreign = container.getElementsByTagName('input');
   return {
           Container: container,
           Local: local,
           Foreign: foreign
var Type = {
    Container: $get('ctl00_Main_rbtnlst_Type'),
    get Local() {return this.Container.getElementsByTagName('input');},
    get Foreign() {return this.Container.getElementsByTagName('input');}

Javascript if statement in append string checking if object property is undefined if not display property?

Tag : javascript , By : cthulhup
Date : March 29 2020, 07:55 AM
help you fix your problem This javascript outputs a few object properties using append , You can express this with a ternary operator:
.html(b.caption + '<div class="cat">' + (typeof b.category !== "undefined" ? b.category : '') +
   '</div>' + etc
.html(b.caption + '<div class="cat">' + (b.category || '') +
   '</div>' + etc
.html("{caption} <div class='cat'>{category}</div> <div class='client'>{client}</div>".format(b))
String.prototype.format = function(props) {
    return this.replace(/{(\w+)}/g, function(_, key) {
        return key in props ? props[key] : "";
b = {
    foo: 123

console.log("hi {foo} and {bar}!".format(b))
// hi 123 and !

HTML Object is shown as undefined in Javascript when using ContentPlaceHolder

Tag : javascript , By : pacorro2000
Date : March 29 2020, 07:55 AM
hope this fix your issue This is not a solution to the problem but an alternate route that is by using ActiveXObject we can access the COM Object in our javascript ,in which case we dont have to use HTML Object

Cannot read property 'push' of undefined creating an array property of an object (Javascript)

Tag : javascript , By : ChaseVoid
Date : March 29 2020, 07:55 AM
I hope this helps you . My constructor Mash needs to have a property that is an array of Grain objects. This is as far as I got and now I am getting an error with my push. Any thoughts? , You forgot to initialize the variable grains in Mash constructor.
function Mash(volume) {
    this.grains = [];
    this.volume = volume;

    this.addGrain = function(grain) {

    this.calcEOG = function() {
        let total = 0;
        this.grains.forEach(item => {
            total += item.calMaxPPG();
        return total / this.volume;

function Grain(name, maxPPG, quantity) {
    this.name = name;
    this.maxPPG = maxPPG;
    this.quantity = quantity;

    this.calMaxPPG = function() {
        return this.maxPPG * this.quantity;
// before dealing with data, work on your classes
function Grain(name, maxPPG, quantity) {
    this.name = name;
    this.maxPPG = maxPPG;
    this.quantity = quantity;
// and as @HMR said, always declare your class functions with prototypes
Grain.prototype.MaxPPG = function() {
    return this.maxPPG * this.quantity;
function Mash(volume, grains) {
    this.volume = volume;
    this.grains = grains;
Mash.prototype.calcEOG = function() {
    var total = 0;
    this.grains.forEach(item => {
        total += item.MaxPPG();
    return total / this.volume;
// So after all you'll instance your classes easy.
var grain1 = new Grain("Pale Malt (2 Row)", 9, 37),
    grain2 = new Grain("Caramel/Crystal Malt - 20L", .75, 35);
var mash = new Mash(7, [grain1, grain2]); // note that litle change I did :p

Why do I get an undefined javascript object property whereas the property does exist

Tag : javascript , By : Kocur
Date : March 29 2020, 07:55 AM
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