how to generate barcode in c# net with example <ul> <li><%=h event.occurs_on %></li> <li><%=h event.location %></li> </ul> in Font

Draw QR-Code in Font <ul> <li><%=h event.occurs_on %></li> <li><%=h event.location %></li> </ul>

<ul> <li><%=h event.occurs_on %></li> <li><%=h event.location %></li> </ul>
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with the code shown in Listing 7-18.
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CHAPTER 7 IMPROVING INTERACTION WITH AJAX
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Listing 7-18. Adding the in_place_editor Helper to app/views/events/_event.rhtml
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<ul> <li><%=h event.occurs_on %></li> <li><span id="event_location_<%= event.id %>"><%=h event.location %></span></li> </ul> <%= in_place_editor("event_location_#{event.id}", :loading_text => "Saving...", :cancel_text => "Cancel", :save_text => "Save", :url => { :action => "update_location", :id => event }) if event.owned_by current_user %>
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First, we needed to wrap the location field in a <span> element and give it a specific id attribute so it can be uniquely identified. To do this, we tacked the event.id (which we know is unique) onto the end of event_location using a little ERb:
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<span id="event_location_<%= event.id %>">
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This will give us element id values like event_location_1 and event_location_2. We do the same thing when we tell the in_place_editor method which element we want it to work on:
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<%= in_place_editor("event_location_#{event.id}", #...) %>
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The in_place_editor accepts options to customize the text to show on the submit button and the cancel link. We ve set these to sensible values: Cancel and Save. Finally, we ve used the url option to specify the action to invoke when the Save button is clicked. Also notice how we ve applied an if modifier after the call to in_place_editor that checks to make sure the event is owned by the currently logged-in user. This will effectively disable in-place editing for all but the event s owner. When the Save button is clicked, the in_place_editor form will be serialized and the value in the text box sent to the server in a parameter called value. The controller action needs to process the value and return the updated value in the body of the response. To implement this, we need to create an update action on the controller to handle the request, which is what we ll add next. When implementing the update action used with the in_place_editor, we need to pay attention to a specific convention: the action should be named update_field_name, where field_name is the name of the field to be updated. Since we re updating the location field, our method will be called (you guessed it) update_location. Add the update_location action to the events controller, as shown in Listing 7-19.
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CHAPTER 7 IMPROVING INTERACTION WITH AJAX
Listing 7-19. Adding the update_location Action in app/controllers/events_controller.rb
def update_location Event.update(params[:id], {:location => params[:value]}) render :text => params[:value] end
This will update the event whose id matches that of params[:id] with the changed location value before rendering the entered value using render :text effectively, replacing the previous location with the newly entered value. Now that we have everything set up, it s time to enjoy the fruits of our labor and see the in-place editor in action. With the application running, reload the events listing and select an event. When you click the event location, it should change to a text field that allows you to edit and save the location right there on the page, as shown in Figure 7-8.
Figure 7-8. In-place editor in action
CHAPTER 7 IMPROVING INTERACTION WITH AJAX
Adding Visual Effects
The script.aculo.us library also includes a rich, cross-browser animation framework that makes creating fancy effects a breeze. Like the rest of script.aculo.us, the animation framework is built on top of Prototype and includes several handy prebuilt functions. Let s take a quick look at some of the effects you can create.
Toggling Visibility
One of the rules of good interface design is to make things snappy. That is to say, the interface should be responsive and quick to load. A good way to achieve this is by loading elements (like forms or content areas) onto the page in advance, but hiding them until they re ready to be used. By doing this, you can toggle their visibility using JavaScript on the client side, which is several times faster than reloading the page from the server. To make hiding and revealing elements easier, the script.aculo.us Effect class includes the functions show, hide, and toggle. You simply specify the id of the element you want to manipulate and the name of the effect to apply, which can be appear, slide, or blind. The following is an example of using toggle. Notice that we make sure the element starts out as hidden by applying an in-line style of display:none.
<%= link_to_function 'Toggle Hello World', "Effect.toggle('hello_world', 'blind')" %> <div id="hello_world" style="display:none"> <p>Hello World!</p> </div>
We used Effect.toggle to toggle the hello_world element using the blind effect. Notice that we used the link_to_function helper to create the link. Unlike the regular link_to helper, which accepts a URL or method to generate a URL, link_to_function accepts JavaScript code to execute on the element s onclick event. The resulting HTML will look like this:
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