how to generate barcode in c# net with example <a href="#" onclick="Effect.toggle('hello_world', 'blind'); return false;"> Toggle Hello World</a> in Font

Draw Denso QR Bar Code in Font <a href="#" onclick="Effect.toggle('hello_world', 'blind'); return false;"> Toggle Hello World</a>

<a href="#" onclick="Effect.toggle('hello_world', 'blind'); return false;"> Toggle Hello World</a>
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We can supply toggle with a few arguments to customize its behavior. For example, if we wanted to shorten the duration of the effect to make it expand and collapse more quickly, we could set the duration option:
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<%= link_to_function 'Toggle Hello World', "Effect.toggle('hello_world', 'blind', {duration: .2})" %>
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CHAPTER 7 IMPROVING INTERACTION WITH AJAX
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Script.aculo.us has a set of core effects that can be combined to create new visual effects, and it also Tip
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has a set of combination effects that are based on the core effects. Take a look at the Combination Effects Demo page at http://wiki.script.aculo.us/scriptaculous/show/CombinationEffectsDemo to learn more about all the different options available.
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Using the Yellow Fade Technique
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In some situations, you might want to direct the user s attention to a recently updated area of your page. This is a common practice when using Ajax, since lack of a page refresh leaves little to indicate that something has happened. 37signals pioneered a technique dubbed the Yellow Fade Technique, which creates a yellow highlight that briefly identifies a change to the page before fading away after a second or two. Script.aculo.us implements the Yellow Fade Technique using the highlight function. You can apply it in the same fashion as the toggle effect we looked at in the previous section. For example, to highlight an area of the page immediately after it loads, just add the following anywhere in your template:
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<script type="text/javascript"> new Effect.Highlight('some_element'); </script>
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Rails makes it even easier to attach visual effects, however, by way of the visual_ effect helper. This is actually a Ruby method that returns the JavaScript necessary to render the effect. Here s an example that will apply the highlight effect to a specific element in response to clicking a link.
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<div id="higlightable"> <%= link_to_function 'Click Me!', visual_effect(:highlight, 'higlightable', :duration => 2.0) %> </div>
We could just have easily supplied the JavaScript directly, as we did with the toggle example, but using the visual_effect helper lets us stick to pure Ruby, instead of dropping down to JavaScript.
CHAPTER 7 IMPROVING INTERACTION WITH AJAX
Using RJS Templates
You ve seen that Rails support for Ajax is comprehensive and fairly simple to use. However, as the complexity of web pages grows with the number of elements that need to be updated due to user interaction, the model we described becomes very complicated and starts to show signs of weakness. To make managing complex Ajax interactions easier, a major feature was introduced (in Rails 1.1): Ruby JavaScript (RJS) templates. RJS templates allow you to express the response to user interactions in pure Ruby code, which is then transformed into JavaScript before being sent to the browser. Unlike conventional templates that are used to render the results of an action, RJS templates generate instructions on how to modify an already rendered page. This approach has the following advantages: You can express yourself using pure Ruby. You can extract Ajax responses from your ERb templates, moving them to a separate file, and making them easier to debug and maintain. You can call any Rails methods and assign them to JavaScript variables.
Implementing RJS in Templates
Let s go back to one of our earlier Ajax examples and implement it using RJS. When we were experimenting with the ajax controller, we used the form_remote_tag helper to create a new event using Ajax. If you ll recall, we defined callbacks to show and hide a progress indicator while the form was being submitted. Here s what it looked like:
Add a new event: <% form_remote_tag(:update :loading :complete :url
=> => => =>
"count", $('indicator_form').show(), $('indicator_form').hide(), { :controller => 'ajax', :action => "save_event" }) do %>
<p>Title<br/><%= text_field 'event', 'title' %></p> <p>Location<br/><%= text_field 'event', 'location' %></p> <%= submit_tag 'Save' %> <%= image_tag 'indicator.gif', :id => 'indicator_form', :style => 'display:none' %> <% end %>
CHAPTER 7 IMPROVING INTERACTION WITH AJAX
<div id="count"> <%= render :partial => "events_count" %> </div>
This is all well and good, but you can see how it could get pretty unwieldy if we needed to do more than a few things on :loading and :complete. What if, in addition to showing and hiding the progress indicator, we wanted to highlight the updated count element, reset the form elements, and place the cursor in the Title field Sure, we could probably pull it off, but it wouldn t look very pretty. RJS to the rescue. Just like ERb templates (with the .rhtml extension), RJS templates correspond to controller actions. Our form submits to the save_event action, so we ll create a template to respond to that action, called save_event.rjs, and save it in app/views/ajax. As expected, it will be executed in response to the save_event action. In RJS templates, you have access to a special variable named page, which represents the web page on which you ll be acting. The responsibility of the RJS file is to manipulate page elements after an Ajax request, as we did with the :update parameter. The RJS template has more flexibility, as you can access any element on the page, instead of being constrained by the element indicated by the :update parameter. Let s get down to coding the template now. We ll start by outlining what we want the response to be, and then we ll implement the necessary RJS. After submitting the form, we want to do the following things on the rendered page: Update the count element. Highlight the count element to show that a change has taken place. Clear the values from the title and location form elements. Place the cursor inside the title element so it s ready for the next input. Hide the status indicator. The RJS required to implement these actions is shown in Listing 7-20.
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