File Upload widget with multiple file selection, drag&drop support, progress bars, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads and client-side image. We'll explore file uploading, such as how to implement asynchronous file uploading with Rails as well as uploading multiple files using AJAX. Rails Form helpers. Forms in web applications are an essential interface for user input. However, form markup can quickly become tedious to write and maintain because of form control naming and their numerous attributes. Rails. # 1. 이미지로 대체하자. <script> // 파일찾기 function fncProductFile() { document.Form.txtProductFile.click(); document.Form.txtProductFileName.value=document.Form.txtProductFile.value;} </script> <form name='Form. You may have a requirement in which you want your site visitors to upload a file on your server. Rails makes it very easy to handle this requirement. Now we will proceed with a simple and small Rails project. As usual, let's.
JQuery Upload File plugin provides Multiple file Uploads with progress bar.Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads. 1.3 Helpers for Generating Form Elements. Rails provides a series of helpers for generating form elements such as checkboxes, text fields, and radio buttons. These basic helpers, with names ending in _tag (such as text_field.
Form Helpers — Ruby on Rails Guides. This guide is not intended to be a complete documentation of available form helpers and their arguments. Please visit the Rails API documentation for a complete reference. Dealing with Basic Forms. The most basic form helper is form_tag. Form contents. < % end %>.
When called without arguments like this, it creates a < form> tag which, when submitted, will POST to the current page. For instance, assuming the current page is /home/index, the generated HTML will look like this (some line breaks added for readability). UTF- 8" action="/" method="post">. J7. CBxf. Halt. 49. OSHp. 27hblq. K2. Pgw. J1. 08n. DHX/8.
Cts=" />. Form contents. You'll notice that the HTML contains an input element with type hidden. This input is important, because the form cannot be successfully submitted without it.
The hidden input element with the name utf. GET" or "POST". The second input element with the name authenticity_token is a security feature of Rails called cross- site request forgery protection, and form helpers generate it for every non- GET form (provided that this security feature is enabled). You can read more about this in the Security Guide.
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A Generic Search Form. One of the most basic forms you see on the web is a search form. This form contains: a form element with "GET" method,a label for the input,a text input element, anda submit element. To create this form you will use form_tag, label_tag, text_field_tag, and submit_tag, respectively. Like this. < %= form_tag("/search", method: "get") do %>. Search for: ") %>.
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Search") %>. < % end %>. This will generate the following HTML. UTF- 8" action="/search" method="get">. Search for: < /label>.
Search" />. For every form input, an ID attribute is generated from its name ("q" in above example). These IDs can be very useful for CSS styling or manipulation of form controls with Java.
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Script. Besides text_field_tag and submit_tag, there is a similar helper for every form control in HTML. Always use "GET" as the method for search forms. This allows users to bookmark a specific search and get back to it.
More generally Rails encourages you to use the right HTTP verb for an action. Multiple Hashes in Form Helper Calls.
The form_tag helper accepts 2 arguments: the path for the action and an options hash. This hash specifies the method of form submission and HTML options such as the form element's class. As with the link_to helper, the path argument doesn't have to be a string; it can be a hash of URL parameters recognizable by Rails' routing mechanism, which will turn the hash into a valid URL.
However, since both arguments to form_tag are hashes, you can easily run into a problem if you would like to specify both. For instance, let's say you write this. UTF- 8" action="/people/search? Here, method and class are appended to the query string of the generated URL because even though you mean to write two hashes, you really only specified one. So you need to tell Ruby which is which by delimiting the first hash (or both) with curly brackets. This will generate the HTML you expect. UTF- 8" action="/people/search" method="get" class="nifty_form"> '.
Helpers for Generating Form Elements. Rails provides a series of helpers for generating form elements such as. These basic helpers, with names.
The first parameter to these is always the name of the. When the form is submitted, the name will be passed along with the form. For example, if the form contains. When naming inputs, Rails uses certain conventions that make it possible to submit parameters with non- scalar values such as arrays or hashes, which will also be accessible in params. You can read more about them in chapter 7 of this guide. For details on the precise usage of these helpers, please refer to the API documentation.
Checkboxes. Checkboxes are form controls that give the user a set of options they can enable or disable. I own a dog") %>. I own a cat") %>. This generates the following.
I own a dog< /label>. I own a cat< /label>. The first parameter to check_box_tag, of course, is the name of the input. The second parameter, naturally, is the value of the input. This value will be included in the form data (and be present in params) when the checkbox is checked. Radio Buttons. Radio buttons, while similar to checkboxes, are controls that specify a set of options in which they are mutually exclusive (i.
I am younger than 2. I'm over 2. 1") %>. I am younger than 2.
I'm over 2. 1< /label>. As with check_box_tag, the second parameter to radio_button_tag is the value of the input. Because these two radio buttons share the same name (age), the user will only be able to select one of them, and params[: age] will contain either "child" or "adult".
Always use labels for checkbox and radio buttons. They associate text with a specific option and. Other Helpers of Interest. Other form controls worth mentioning are textareas, password fields. URL fields, email fields, number fields and range fields.
Hi, nice site", size: "2. Hi, nice site< /textarea>. Hidden inputs are not shown to the user but instead hold data like any textual input. Values inside them can be changed with Java. Script. The search, telephone, date, time, color, datetime, datetime- local. URL, email, number and range inputs are HTML5 controls. If you require your app to have a consistent experience in older browsers.
HTML5 polyfill (provided by CSS and/or Java. Script). There is definitely no shortage of solutions for this, although a popular tool at the moment is. Modernizr, which provides a simple way to add functionality based on the presence of. HTML5 features. If you're using password input fields (for any purpose), you might want to configure your application to prevent those parameters from being logged. You can learn about this in the Security Guide.
Dealing with Model Objects. Model Object Helpers. A particularly common task for a form is editing or creating a model object. While the *_tag helpers can certainly be used for this task they are somewhat verbose as for each tag you would have to ensure the correct parameter name is used and set the default value of the input appropriately. Rails provides helpers tailored to this task.
These helpers lack the _tag suffix, for example text_field, text_area. For these helpers the first argument is the name of an instance variable and the second is the name of a method (usually an attribute) to call on that object. Rails will set the value of the input control to the return value of that method for the object and set an appropriate input name. If your controller has defined @person and that person's name is Henry then a form containing. Henry"/>. Upon form submission the value entered by the user will be stored in params[: person][: name]. The params[: person] hash is suitable for passing to Person.
Person, @person. update. While the name of an attribute is the most common second parameter to these helpers this is not compulsory. In the example above, as long as person objects have a name and a name= method Rails will be happy. You must pass the name of an instance variable, i. Rails provides helpers for displaying the validation errors associated with a model object. These are covered in detail by the Active Record Validations guide.
Binding a Form to an Object. While this is an increase in comfort it is far from perfect.
If Person has many attributes to edit then we would be repeating the name of the edited object many times. What we want to do is somehow bind a form to a model object, which is exactly what form_for does.
Assume we have a controller for dealing with articles app/controllers/articles_controller. Article. new. The corresponding view app/views/articles/new. Create" %>. < % end %>. There are a few things to note here: @article is the actual object being edited.
There is a single hash of options. Routing options are passed in the : url hash, HTML options are passed in the : html hash. Also you can provide a : namespace option for your form to ensure uniqueness of id attributes on form elements. The namespace attribute will be prefixed with underscore on the generated HTML id. The form_for method yields a form builder object (the f variable). Methods to create form controls are called on the form builder object f. The resulting HTML is.
UTF- 8" action="/articles" method="post" class="nifty_form">. Create" />. The name passed to form_for controls the key used in params to access the form's values.
Here the name is article and so all the inputs have names of the form article[attribute_name]. Accordingly, in the create action params[: article] will be a hash with keys : title and : body. You can read more about the significance of input names in the parameter_names section. The helper methods called on the form builder are identical to the model object helpers except that it is not necessary to specify which object is being edited since this is already managed by the form builder. You can create a similar binding without actually creating < form> tags with the fields_for helper. This is useful for editing additional model objects with the same form. For example, if you had a Person model with an associated Contact.
Detail model, you could create a form for creating both like so. UTF- 8" action="/people" class="new_person" id="new_person" method="post">. The object yielded by fields_for is a form builder like the one yielded by form_for (in fact form_for calls fields_for internally). Relying on Record Identification.
The Article model is directly available to users of the application, so - following the best practices for developing with Rails - you should declare it a resource: Declaring a resource has a number of side effects. See Rails Routing From the Outside In for more information on setting up and using resources. When dealing with RESTful resources, calls to form_for can get significantly easier if you rely on record identification.