However, since both arguments to 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. 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.
If you require your app to have a consistent experience in older browsers, you will need an 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 detected HTML5 features. 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.
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 will set the value of the input control to the return value of that method for the object and set an appropriate input name.
Forms in web applications are an essential interface for user input.
However, form markup can quickly become tedious to write and maintain because of the need to handle form control naming and its numerous attributes.
Rails does away with this complexity by providing view helpers for generating form markup.
However, since these helpers have different use cases, developers need to know the differences between the helper methods before putting them to use.
After reading this guide, you will know: 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.
One of the most basic forms you see on the web is a search form.
This form contains: 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.