Computing value in knockout

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Hi friends,
I have tried following

function fill() {
  this.months = ko.observableArray(['Jan', 'Feb', 'Mar', 'etc']);

  this.KpiTilesBobMetadata = ko.observableArray([
    { Name: 'Spend', Url: '' },
    { Name: 'Budget Paused', Url: 'Alerts tab in BoB' }
  ]);

  this.enable = ko.computed(function () {
    if (this.KpiTilesBobMetadata.Url() == '')
      return false;
    else
      return true;
  });
}

ko.applyBindings(fill());

<ul data-bind="foreach: KpiTilesBobMetadata">
    <li>
        <a data-bind="attr: {href : Url}, text : Name, if: enable"></a>
    </li>
</ul>

What I'm trying to do is, If Url is blank then the tag will be not displayed.

May I know where I'm going wrong?

Posted 20-May-14 22:05pm

dhage.prashant01

Updated 20-May-14 22:24pm

Kornfeld Eliyahu Peter

v2

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Kornfeld Eliyahu Peter 21-May-14 4:26am

See the second example here: http://knockoutjs.com/documentation/if-binding.html

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Sunasara Imdadhusen · Accepted Answer · 2014-05-20T22:44:00

Solution 1

Hi Prashant,

Please try following:

JavaScript

{ Name: 'Spend', Url: null }

<ul data-bind="foreach: KpiTilesBobMetadata">
    <li data-bind="if: Url">
        <a data-bind="attr: {href : Url}, text : Name, if: enable"></a>
    </li>
</ul>

This <ul><li> will only show when it contains values</li></ul>

Posted 20-May-14 22:44pm

Sunasara Imdadhusen

Comments

dhage.prashant01 21-May-14 5:00am

When I try to debug the code, it give me error saying cannot find Url in
this.KpiTilesBobMetadata.Url()

Kornfeld Eliyahu Peter 21-May-14 5:03am

That because this.KpiTilesBobMetadata is an array.
It should be something like this.KpiTilesBobMetadata[0].Url().
But that will not help you anyway...
Take your time and try to understand Sunasara's solution - also take the sample I posted in the comment. Learn it and twist it as you wish...

dhage.prashant01 21-May-14 8:36am

TQ it has worked