11: All About Helpers in Java

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11: All About Helpers
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select tag In the case of our example, the controller would populate the businesses
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expose(:businesses) do Businesswhere()includes(:category) end
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Hashes are turned into a form acceptable to options_for_select automatically the keys become firsts and values become lasts If selected parameter is specified (with either a value or array of values for multiple selections), the matching last or element will get the selected attribute:
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>> options_for_select([["Dollar", "$"], ["Kroner", "DKK"]]) <option value="$">Dollar</option> <option value="DKK">Kroner</option> >> options_for_select([ "VISA", "MasterCard" ], "MasterCard") <option>VISA</option> <option selected="selected">MasterCard</option> >> options_for_select({ "Basic" => "$20", "Plus" => "$40" }, "$40") <option value="$20">Basic</option> <option value="$40" selected="selected">Plus</option> >> options_for_select([ "VISA", "MasterCard", "Discover" ], ["VISA", "Discover"]) <option selected="selected">VISA</option> <option>MasterCard</option> <option selected="selected">Discover</option>
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A lot of people have trouble getting this method to correctly display their selected item Make sure that the value you pass to selected matches the type contained in the object collection of the select; otherwise, it won t work In the following example, assuming price is a numeric value, without the to_s, selection would be broken, since the values passed as options are all strings:
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>> options_for_select({ "Basic" => "20", "Plus" => "40" }, priceto_s) <option value="20">Basic</option> <option value="40" selected="selected">Plus</option>
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options from collection for select(collection, value method, text method, selected = nil)
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Returns a string of option tags that have been compiled by iterating over the collection and assigning the result of a call to the value_method as the option value and the text_method as the option text If selected is specified, the element returning a match on value_method will get preselected
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1110 FormTagHelper
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time zone options for select(selected = nil, priority zones = nil, model = TimeZone)
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Returns a string of option tags for pretty much any timezone in the world Supply a TimeZone name as selected to have it preselected You can also supply an array of TimeZone objects as priority_zones, so that they will be listed above the rest of the (long) list TimeZoneus_zones is a convenience method that gives you a list of the US timezones only The selected parameter must be either nil, or a string that names a TimeZone (covered in the Appendix A, ActiveSupport API Reference) By default, the model is the TimeZone constant (which can be obtained in Active Record as a value object) The only requirement is that the model parameter be an object that responds to all, returning an array of objects representing timezones
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1110 FormTagHelper
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The following helper methods generate HTML form and input tags based on explicit naming and values, contrary to the similar methods present in FormHelper, which require association to an Active Record model instance All of these helper methods take an options hash, which may contain special options or simply additional attribute values that should be added to the HTML tag being generated
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check box tag(name, value = "1", checked = false, options = {})
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Creates HTML for a check box input field Unlike its fancier cousin, check_box in FormHelper, this helper does not give you an extra hidden input field to ensure that a false value is passed even if the check box is unchecked
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>> check_box_tag('remember_me') => <input id="remember_me" name="remember_me" type="checkbox" value="1"/> >> check_box_tag('remember_me', 1, true) => <input checked="checked" id="remember_me" name="remember_me" type="checkbox" value="1" />
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Helpers
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email field tag(name, value = nil, options = {})
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Creates an email input field This method is otherwise identical to text_field_tag
field set tag(legend = nil, options = nil, & block)
Wrap the contents of the given block in a fieldset tag and optinally give it a legend tag
11: All About Helpers
file field tag(name, options = {})
Creates a file upload field Remember to set your HTML form to multipart or file uploads will mysteriously not work:
- form_tag '/upload', :multipart => true do = label_tag :file, 'File to Upload' = file_field_tag :file = submit_tag
The controller action will receive a File object pointing to the uploaded file as it exists in a tempfile on your system Processing of an uploaded file is beyond the scope of this book If you re smart, you ll use Jonas Nicklas excellent CarrierWave gem instead of reinventing the wheel6
form tag(url for options = {}, options = {}, *parameters for url, & block)
Starts a form tag, with its action attribute set to the URL passed as the url_for_options parameter It is aliased as start_form_tag The :method option defaults to POST Browsers handle HTTP GET and POST natively; if you specify put, delete, or any other HTTP verb is used, a hidden input field will be inserted with the name _method and a value corresponding to the method supplied The Rails request dispatcher understands the _method parameter, which is the basis for the RESTful techniques you learned in 3 The :multipart option allows you to specify that you will be including file-upload fields in the form submission and the server should be ready to handle those files accordingly
>> form_tag('/posts') => <form action="/posts" method="post"> >> form_tag('/posts/1', :method => :put) => <form action="/posts/1" method="put"> >> form_tag('/upload', :multipart => true) => <form action="/upload" method="post" enctype="multipart/form-data">
You might note that all parameters to form_tag are optional If you leave them off, you ll get a form that posts back to the URL that it came from a quick and dirty solution that I use quite often when prototyping or experimenting To quickly set up a