Rails - input default value from record - ruby-on-rails

Perhaps I'm being silly but I've been trying to set a default value for an input with ruby on rails for hours and haven't cracked it.
I'm making a partial which can either allow users to create new records but will also show existing records if they exist. Code as follows
<input type="text" <%= (#prices.empty? || #prices.first.name.length == 0) ? 'placeholder="General admission"' : "value=" + #prices.first.name.to_s %> >
Which works perfectly for any value that exists UNLESS there is a space, for example, if price.name = "general admission" OR if price.name = "" (in which case it prints the placeholder) I get the following produced
<input type="text" admission'="" value="'general" id="event_price_name" name="[event][price][0][name]" aria-label="..." class="form-control">
It seems to get tripped up by the space.
Am I trying to use Rails in a way it wasn't designed to be done in? I'm more used to PHP which may be it!
Thanks

You should use the text_field_tag helper to build the input, this is preferred over building it with partial interpolation. Also, placeholder will automatically be overwritten if there is a value so you don't need to handle that part in the code, that's how it behaves by default on the browser.
<%= text_field_tag :admission, #prices.first.name.to_s, {placeholder: 'General Admission'} %>

Related

Getting Params from raw HTML components in Rails

I'm making an input form whose features don't fit so nicely into the general form_for template rails provides. I figured I would write my own HTML mimicking the html output of form_for, but embedded with other form_for elements.
For fields I could use the rails framework for I did. For the others I made hidden fields to store what was going to Rails, and regular input fields whose values I manipulated with JavaScript to put into the hidden fields.
This is one such field:
State:<br>
<input type="text" class = "state name_input administrative_area_level_1">
<div class="field">
<input type="hidden" name="address[state]" id="state">
</div>
When I send the value of the hidden field to the console, I get a good response:
state 37
Which means the state field holds the value 37. Perfect.
Except that when I try to make my model, the params come in empty:
"state"=>"",
I do have one field that works that isn't hidden:
Street:<br><input type="text" id="street" name="address[street]">
So I changed the state input type to number, which is what it would be if it weren't hidden, but same result. Why can't rails find my param?
You can show post more detail. I can't understand 100% things you do because you write pretty simple. But i guess that you need test params name is address[state] but it's not only state becase if only state of course it nil.
if html of you rendered same up then i suggest you should put one debug in controller to see params return controller when submit form.
For example: in controller you add line:
logger.debug params
to see right params that form send.
If your form is not tied directly to a object model, it might be difficult to use the form_for helper. In those cases you should use form_tag helper. Read more about form_tag helper here.
Refer this stackoverflow answer for the difference between form_for and form_tag helpers.
Hope this helps.

Ruby on Rails checkbox not saving data

I have a checkbox
<%= f.check_box :anonymous %>
And my table has a column anonymous which is true or false.
Code generated in html:
<input name="comment[anonymous]" type="hidden" value="0" />
<input id="comment_anonymous" name="comment[anonymous]" type="checkbox" value="1" />
Now, for some reason when I add data it's not saving if my anonymous checkbox is checked or not.. it's not changing data in database.. All other fields gets saved except anonymous.
What can be the problem ?
Use #check_box_tag instead:
<%= check_box_tag(:anonymous) %>
From the official guides:
Array parameters do not play well with the check_box helper. According
to the HTML specification unchecked checkboxes submit no value.
However it is often convenient for a checkbox to always submit a
value. The check_box helper fakes this by creating an auxiliary hidden
input with the same name. If the checkbox is unchecked only the hidden
input is submitted and if it is checked then both are submitted but
the value submitted by the checkbox takes precedence. When working
with array parameters this duplicate submission will confuse Rails
since duplicate input names are how it decides when to start a new
array element. It is preferable to either use check_box_tag or to use
hashes instead of arrays.

how to put place holder for <%= f.datagrid_filter filter%>?

I made a rails application, and I used datagrid gem to handle filters, pagination,and orders(ascending and descending). I was supposed to write <%= f.datagrid_filter filter%> to filter according to a filed of the table(Ex:title field in topics table).
Now <%= f.datagrid_filter filter%> returns a traditional html input tag like below. <input id="topic_report_title" class="title string_filter" type="text" size="30" name="topic_report[title]"> in the html console.
Now I want to put placeholder in that helper method only.
Can anybody help please?
Have you tried to do the following: <%= f.datagrid_filter filter, :placeholder => "placeholder text"%>

asp.net mvc and valid xhtml?

For some reason an html helper is outputting this html which doesnt validate.
the validator tells me
There is no attribute "Length"
<%= Html.CheckBox("Medicamentos", Model.Medicamentos) %>
is outputting
<input type="checkbox" value="true" name="Medicamentos" id="Medicamentos" checked="checked" length="4">
I assume that it's matching the signature that takes a string and an object since I don't know what Model.Medicamentos is. In that case it takes the properties of the object and turns them into attributes on the element. I suspect that you simply want to use the Checked attribute on the Model property specified as the default value of the checkbox, i.e.,
<%= Html.CheckBox( "Medicamentos", Model.Medicamentos.Checked ) %>
In, which case, assuming that Checked is boolean it will match the correct method signature on the helper extension.

ASP .Net MVC, problem with checkboxes!

Basically I have a set of checkboxes that are dynamically created from view data like so:
<input type="checkbox" name="Calendars" value="<%= c.ID %>" /><%= c.Name %>
The value being the Calendar Id.
I can get what checkbox has been brought back using the FormsCollection its messy but it works!
(There also seems to be a bug with the checkbox helper that renders a hidden field next to the checkbox which means true is actually returned as "true,false"! I can work around this so its not an issue just thought Id mention it)
The problem comes when trying to hook the checkboxes up on an edit page!
I have a schedule class which can have multiple calendars and I want to show which calendars a schedule has by checking them on the edit!
My view is strongly typed but MVC magic can't map this!
Any ideas on whats the best way to do this??
I had tried passing the calendar ids in ViewData and do some inline code to check the appropriate checkbox but this is getting messy!
Thanks!!
UPDATE:
Done this
s.ID == c.ID).Select(s => s).Count() > 0) ? "checked=checked" : "" %>
You need to add "checked" tag manually to every check box:
<input type="checkbox" name="Calendars" value="<%= c.ID %>" checked="checked" /><%= c.Name %>
You dont need <input type="checkbox" - use Html.Checkbox(). It renders a hidden field next to the checkbox - but it is not a bug. From ASP.NET MVC source, InputExtensions.cs, line 201:
// Render an additional <input type="hidden".../> for checkboxes. This
// addresses scenarios where unchecked checkboxes are not sent in the request.
// Sending a hidden input makes it possible to know that the checkbox was present
// on the page when the request was submitted.
Use this:
<%= Html.CheckBox("Calendars", c.ID) %>

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