new recipe: jquery ajax

chapters/jquery/ajax.textile

@@ -0,0 +1,33 @@
+---
+layout: recipe
+title: Ajax
+chapter: jQuery
+---
+
+h2. Problem
+
+You need to make an ajax request using jQuery.
+
+
+h2. Solution
+
+{% highlight coffeescript %}
+jQuery ->
+  console.log "document loaded"
+  $('form').submit (e) ->
+    console.log "form submit"
+    e.preventDefault()
+    form = this
+
+    $.ajax
+      type: "POST"
+      url: $(form).attr('action')
+      data: $(form).serialize()
+      success: -> 
+        console.log("success")
+{% endhighlight %}
+
+
+h2. Discussion
+
+The jQuery and $ variables can be used interchangeably. See also "Callback bindings":../jquery/callback-bindings-jquery.

chapters/objects/create-object-literal-if-not-exist.textile

@@ -0,0 +1,29 @@
+---
+layout: recipe
+title: Create an object literal if it does not already exist
+chapter: Objects
+---
+
+h2. Problem
+
+You want to initialize an object literal, but you do not want to overwrite the object if it already exists.
+
+
+h2. Solution
+
+Use the Existential operator
+
+{% highlight coffeescript %}
+window.MY_NAMESPACE ?= {} 
+{% endhighlight %}
+
+
+h2. Discussion
+
+This is equivalent to the following JavaScript:
+
+{% highlight javascript %}
+window.MY_NAMESPACE = window.MY_NAMESPACE || {};
+{% endhighlight %}
+
+Common JavaScript technique, using object literal to define a namespace. This saves us from clobbering the namespace if it already exists.

wanted-recipes.textile

@@ -108,7 +108,7 @@ console.log [1,2,3,4,5].map (x) ->
 
 h2. jQuery
 
-* jQuery AJAX from CS
+* 
 
 h2. Regular Expressions