Raise error when trying to interact with a disabled form element

History.txt

@@ -8,6 +8,7 @@
   * Support relative links, including href="?foo=bar" (Patch from Kyle Hargraves)
   * Separated Rails-specific code from the Webrat core to make it easier to use Webrat with other environments
   * Alias visits as visit, clicks_link as click_link, etc. for better readability
+  * Raise error when trying to interact with a disabled form element (Luke Melia)
   
 * Minor enhancements
 

lib/webrat/core/field.rb

@@ -45,7 +45,15 @@ module Webrat
     def matches_alt?(alt)
       @element["alt"] =~ /^\W*#{Regexp.escape(alt.to_s)}/i
     end
+
+    def disabled?
+      !@element["disabled"].nil? && @element["disabled"] != 'false'
+    end
     
+    def raise_error_if_disabled
+      raise "Cannot interact with disabled form element (#{self})" if disabled?
+    end
+        
     def to_param
       value = @value.to_s.gsub('&', '%26')
       param_parser.parse_query_parameters("#{name}=#{value}")
@@ -144,6 +152,7 @@ module Webrat
     end
 
     def click
+      raise_error_if_disabled
       set(@element["value"]) unless @element["name"].blank?
       @form.submit
     end
@@ -182,10 +191,12 @@ module Webrat
     end
 
     def check
+      raise_error_if_disabled
       set(@element["value"] || "on")
     end
 
     def uncheck
+      raise_error_if_disabled
       set(nil)
     end
 
@@ -212,6 +223,7 @@ module Webrat
     end
     
     def choose
+      raise_error_if_disabled
       other_options.each do |option|
         option.set(nil)
       end

lib/webrat/core/scope.rb

@@ -22,7 +22,9 @@ module Webrat
     # <tt>field</tt> can be either the value of a name attribute (i.e. <tt>user[email]</tt>)
     # or the text inside a <tt><label></tt> element that points at the <tt><input></tt> field.
     def fills_in(id_or_name_or_label, options = {})
-      find_field(id_or_name_or_label, TextField, TextareaField, PasswordField).set(options[:with])
+      field = find_field(id_or_name_or_label, TextField, TextareaField, PasswordField)
+      field.raise_error_if_disabled
+      field.set(options[:with])
     end
 
     alias_method :fill_in, :fills_in

lib/webrat/core/select_option.rb

@@ -15,6 +15,7 @@ module Webrat
     end
     
     def choose
+      @select.raise_error_if_disabled
       @select.set(value)
     end
     

spec/api/checks_spec.rb

@@ -50,6 +50,16 @@ describe "checks" do
     @session.clicks_button
   end
   
+  it "should fail if the checkbox is disabled" do
+    @session.response_body = <<-EOS
+      <form method="post" action="/login">
+        <input type="checkbox" name="remember_me" disabled="disabled" />
+        <input type="submit" />
+      </form>
+    EOS
+    lambda { @session.checks "remember_me" }.should raise_error
+  end
+  
   it "should result in a custom value being posted" do
     @session.response_body = <<-EOS
       <form method="post" action="/login">
@@ -87,6 +97,16 @@ describe "unchecks" do
     lambda { @session.unchecks "remember_me" }.should raise_error
   end
   
+  it "should fail if the checkbox is disabled" do
+    @session.response_body = <<-EOS
+      <form method="post" action="/login">
+        <input type="checkbox" name="remember_me" checked="checked" disabled="disabled" />
+        <input type="submit" />
+      </form>
+    EOS
+    lambda { @session.unchecks "remember_me" }.should raise_error
+  end
+  
   it "should uncheck rails style checkboxes" do
     @session.response_body = <<-EOS
       <form method="get" action="/login">

spec/api/chooses_spec.rb

@@ -53,7 +53,18 @@ describe "chooses" do
     @session.chooses "Female"
     @session.chooses "Male"
     @session.clicks_button
-  end  
+  end
+  
+  it "should fail if the radio button is disabled" do
+    @session.response_body = <<-EOS
+      <form method="post" action="/login">
+        <input type="radio" name="first_option" disabled="disabled" />
+        <input type="submit" />
+      </form>
+    EOS
+    
+    lambda { @session.chooses "first_option" }.should raise_error
+  end
   
   it "should result in the value on being posted if not specified" do
     @session.response_body = <<-EOS

spec/api/clicks_button_spec.rb

@@ -22,6 +22,17 @@ describe "clicks_button" do
 
     lambda { @session.clicks_button }.should raise_error
   end
+
+  
+  it "should fail if button is disabled" do
+    @session.response_body = <<-EOS
+      <form method="get" action="/login">
+        <input type="submit" disabled="disabled" />
+      </form>
+    EOS
+
+    lambda { @session.clicks_button }.should raise_error
+  end
   
   it "should default to get method" do
     @session.response_body = <<-EOS

spec/api/fills_in_spec.rb

@@ -39,6 +39,18 @@ describe "fills_in" do
     lambda { @session.fills_in "Email", :with => "foo@example.com" }.should raise_error
   end
   
+  it "should fail if input is disabled" do
+    @session.response_body = <<-EOS
+      <form method="get" action="/login">
+        <label for="user_email">Email</label>
+        <input id="user_email" name="user[email]" type="text" disabled="disabled" />
+        <input type="submit" />
+      </form>
+    EOS
+    
+    lambda { @session.fills_in "Email", :with => "foo@example.com" }.should raise_error
+  end
+  
   it "should allow overriding default form values" do
     @session.response_body = <<-EOS
       <form method="post" action="/login">

spec/api/selects_spec.rb

@@ -35,6 +35,18 @@ describe "selects" do
 
     lambda { @session.selects "February", :from => "year" }.should raise_error
   end
+
+  
+  it "should fail if the select is disabled" do
+    @session.response_body = <<-EOS
+      <form method="post" action="/login">
+        <select name="month" disabled="disabled"><option value="1">January</option></select>
+        <input type="submit" />
+      </form>
+    EOS
+
+    lambda { @session.selects "January", :from => "month" }.should raise_error
+  end
   
   it "should send value from option" do
     @session.response_body = <<-EOS