Tutorial Parameter Passing

Parameter passing

In this tutorial we will go over how to pass a parameter to a view.

Passing a parameter to a view

Having a static hello world page is nice, but it would be better if we could pass a message to our hello world page to display it. To do this, we first need to change our view to accept a message and display it.

Changing our view to accept a message is easy. Open the index.clj file and change the line which looks like:

(def-view []

to

(def-view [message]

Since views are basically functions, we can simply add a parameter to the function then use it. To add a parameter to a view function, simply add it to the vector when defining the view.

Now that we have a message parameter, we can display it. Change the line:

[:p "Hello World!"]]))

to

[:p message]]))

We assume message is a string, and simply display it as the content of our view.

The last thing we need to do is pass a message to our view to display it. This requires us to update our binding.

In the src/bindings/home/index.clj file, change the the def-binding:

(def-binding []
  (with-home-request-map
    (render-view)))

to

(def-binding []
  (with-home-request-map
    (render-view "Hello World! (from binding)")))

If we save both files and reload our page, we should see a message from the binding.

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