How does dojo hitch work

The Dojo Toolkit provides a simple way of accomplishing this through the method lang. A problem a developer might face is having a function with multiple arguments being used where a smaller set of arguments is required. With lang. To complete our example above, we'd want to "preset" the store argument with a reference to a specific store and then set someObject. An important thing to note is that unlike lang.

In other words, the meaning of the this keyword can change, depending on how you've used the new partial function. One interesting technique you could do with lang. What if you wanted the best of what hitch does forcing an execution context with the best of what partial does presetting arguments? Well, it turns out that lang. Let's take a similar example to the above:. In this tutorial, we've reviewed the JavaScript Function object—including the invocation process when a function is called. We then introduced lang.

From there, we learned how to bind arguments to a function using lang. Sign in Sign up. Instantly share code, notes, and snippets.

Created Feb 10, Code Revisions 1 Stars 1. Embed What would you like to do? Embed Embed this gist in your website. Share Copy sharable link for this gist. Learn more about clone URLs. Download ZIP. This function allows you to control how a function executes, particularly in asynchronous operations. How many times have you done something like:. Only to have it fail with a cryptic error like: dataLoaded is not a function, or errors about unresolved variables? Why does that occur?

It will no longer refer to the widget that originally provided it, but its scope will now refer to the enclosing object, the xhr arguments! Unlike Function. When lang. Aside from being slightly more compact, this form of lang. For example, if a new function were assigned to the handleClick property of myObject , a binding made using lang.

Now that a context object has been correctly bound to the click callback, the example above works as expected. That was easy! We are committed to achieving technical objectives, solving critical business problems and can put you on the right path to building applications the right way the first time.