Download file using data-bind knockout

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Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Asked 5 years ago. Active 5 years ago. Viewed 3k times. Improve this question. Please fix the obvious syntax errors in your code and provide all code relevant to the problem. The computed value keeps track of all its bindings firstName and lastName and updates automatically when one of them changes. This sets the binding context and will cause our page to be updated and show the values of our person object.

So why then would we use Knockout? Well, first of all, with jQuery you need to manually update variables in memory and values on your page. We simply create some object, bind it to our form and we have nothing else to worry about. Notice that I bind the click event of the button to the submit function, this is called the click binding.

Now here you should see some real gain from Knockout! No need for any DOM traversal on our side. The beauty is that you can use this form obect anywhere in your code and nowhere do you have to worry about getting the correct values from- or updating the correct values to the DOM.

So what if we have an array of items and we want to bind to that? Luckily Knockout has an observableArray which makes this pretty easy. Each album has an artist, name and genre. So albums is just an observableArray , which is created in much the same way as a regular observable. We can simply bind an observableArray using the foreach binding. The artist , name and genre in the data-binds are called on the current object in the foreach.

Notice that the add button simply calls the add function, which is on our current binding context outside of the foreach loop. Basically the remove function will not be called in the context of your ViewModel. And then we have an add and remove function. We can then create a new instance and apply the bindings to our context. You will notice that if you put both tables in your HTML like I did that the read-only table gets updated when you update the editable table.

How awesome is that? And in your JavaScript all albums are, of course, automatically synced. Knockout has a solution for this scenario too. Next to the if binding there is a visible binding in there. Notice how the three act the same, but are actually different. Here are some examples:. The binding name should generally match a registered binding either built-in or custom or be a parameter for another binding.

If the name matches neither of those, Knockout will ignore it without any error or warning. The binding value can be a single value, variable, or literal or almost any valid JavaScript expression. Here are examples of various binding values:.