Question

I want to be able to have a table show only if there are items in an array. I have simplified down my needs to this jsfiddle example.

JS:

var view_model = {
    lines: ko.observableArray([
        {
        content: 'one'},
    {
        content: 'two'},
    {
        content: 'three'},
    {
        content: 'four'},
        ]),
    remove: function(data) {
        view_model.lines.remove(data);
    }
};

ko.applyBindings(view_model);

HTML:

<span data-bind="visible:lines">Lines Exist</span> 
<ul data-bind='foreach:lines'>
    <li>
        <button data-bind="click:$parent.remove">
            Remove
        </button>
        <span data-bind="text:content"></span>
    </li>
</ul>

Basically I have a web app where lines can be removed from table. If array.length == 0, I want to hide the entire table.

Answer 1

You can do this in several ways. The fiddle below uses the containerless bindings to hide the entire table if the lines array has no entries.

http://jsfiddle.net/johnpapa/WLapt/4/

<span data-bind="visible:lines">Lines Exist</span> 
<!-- ko if: lines().length > 0-->
<p>Here is my table</p>
<ul data-bind='foreach:lines'>
    <li>
        <button data-bind="click:$parent.remove">
            Remove
        </button>
        <span data-bind="text:content"></span>
    </li>
</ul>
<!-- /ko -->​