I want to bind image source to following div.

<div class="head_label"><img class="bank_photo" data-bind="attr:{src: bankImage}"></div>

Following is my ajax call and their is my variable which I want to bind to image src.

function ($, ko, Component) {
    'use strict';

    var bankImage = '';

    return Component.extend({
        defaults: {
            template: 'Nitesh_Payment/payment/form',
            transactionResult: ''
        ajaxCall: function(){
                    var cc = $(this).val();
                    var cc_length = cc.length;
                        var data= {cc:cc}
                            dataType: 'json',
                            url: url,
                            data: data,
                            type: 'post',
                            success: function(result)
                                var myObj = result;
                                this.bankImage = myObj.image;
                            error: function(){
                                alert("You Failed!");




Also I am unable to access bankImage variable inside Ajax call. Please tell me how to access that variable in ajax function.

  • Solved : HTML <img id="bankImage" class="bank_photo" src=""> And in success function added -> $('#bankImage').attr('src',result.image); my problem solved Jan 13, 2017 at 9:27

2 Answers 2


At first, add your variable to defaults object, and you will be able to set default value for field.

defaults: {
    bankImage : null

Define your variable as observable

 * Initialize observable properties
initObservable: function () {

    return this;

And you need to define correct success handler with component context:

success: (function(result) {
  • 1
    Thanks for ur quick reply. this.bankImage is not function then how can I use that way in success. Jan 12, 2017 at 14:21
  • I have used this.bankImage = result.image; Instead of this.bankImage(result.image); But then also there is no error in console and image is not bind to that div. Jan 12, 2017 at 14:25
  • 1
    this.bankImage will be rewrited as function, after defining as observable. knockoutjs.com/documentation/observables.html
    – Max
    Jan 12, 2017 at 14:25
  • When i have used as u say then there is error this.bankImage is not a function Jan 12, 2017 at 14:28
  • Did you add initObservable function?
    – Max
    Jan 12, 2017 at 14:35


<img id="bankImage" class="bank_photo" src="">

And in success function added ->


My problem solved

  • This is not bind data in knockout, miss-leading title.
    – Tomi
    Jan 21, 2018 at 7:15
  • 1
    @Tomi why you down vote my answer instead of question edit? Jan 30, 2018 at 9:03

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