Users can submit multiple message numbers in a web form:
<input type="text" name="message"/>
But when I read params[:message] in a rails controller, I only get the first message number. Is there a way to get an array of message numbers?
I know I could have something like the following:
<input type="text" name="message1"/>
<input type="text" name="message2"/>
<input type="text" name="message3"/>
But it would be so much nicer and easier if I could simply get an array of numbers.
Figured it out, noticed a section in the Ruby on Rails guide about Understanding Parameter Naming Conventions which described what to do:
<input type="text" name="message[]"/>
Related
I'm attempting to write a little script that, as part of it, would automatically complete a webform using data from a dictionary.
I've developed this script for other forms in the past with a pretty simple setup: the elements in the form are identified with a line like...
<input type="text" name="full_name" id="full_name_id" maxlength="80" value="">
<input type="text" name="title" id="title_id" maxlength="80" value="">
So, I'd navigate to www.theformsite.com/theform.php?full_name_id=David&title_id=Stuff and find those slots already filled in.
For a couple new forms I've been working with though, that doesn't seem to work: there's no response to these parameters. Are there any general things that could prevent this from working that I should check on?
I'm trying to have a dynamic set of inputs in a form, that start with just one, where you can add or remove them with add/delete buttons. Then upon submission of a form, it turns the values of the inputs into a hash then that hash into a string for storing. I really have no idea where to start. So any tips will be helpful.
If using javascript would help, I can go that route, but i'm not sure how to make the javascript and ruby talk.
Depending on your use-case, there are a few options you might want to use. Since you've tagged this with rails, I'm assuming you have access to JQuery. Here's one (very simple) example of how you might go about adding fields to the page dynamically using it:
https://jsfiddle.net/3Lyvw0jm/
If you plan on storing these fields in one of your models, you may want to take a look at implementing nested attributes.
As pretty much a common web thing (not Rails-specific), you would make the name value look like some_name[].
So instead of having multiple inputs with different names like this:
<input type='text' id='my_input_1' name='my_input_1' value='string_1' />
<input type='text' id='my_input_2' name='my_input_2' value='string_2' />
<input type='text' id='my_input_3' name='my_input_3' value='string_3' />
...where on the server you get:
params :my_input_1 # 'string_1'
params :my_input_2 # 'string_2'
params :my_input_3 # 'string_3'
You would have:
<input type='text' id='my_input_1' name='my_inputs[]' value='string_1' />
<input type='text' id='my_input_2' name='my_inputs[]' value='string_2' />
<input type='text' id='my_input_3' name='my_inputs[]' value='string_3' />
...where on the server you get:
params :my_inputs # ['string_1','string_2',string_3']
I was working on a webbot and I came across this strange page where multiple variables had the same name but different values in as shown by the Firefox web console. I am not sure as to how I can replicate this behavior in python. Currently, I am using the requests library to make post requests and that takes in a dictionary of name and value pairs. And of course, dictionaries have unique keys. So I was wondering if anyone could tell me how to send post requests with multiple variables carrying the same name.
sel_subj:dummy
sel_subj:ECE
Thanks,
Rajiv
Edit: Here is the html source that causes this
<input type="hidden" value="dummy" name="rsts"></input>
<input type="hidden" value="dummy" name="crn"></input><br></br>
<input type="hidden" value="120138" name="term_in"></input>
**<input type="hidden" value="dummy" name="sel_subj"></input>**
<input type="hidden" value="dummy" name="sel_day"></input>
<input type="hidden" value="dummy" name="sel_schd"></input>
<input type="hidden" value="dummy" name="sel_insm"></input>
<input type="hidden" value="dummy" name="sel_camp"></input>
<input type="hidden" value="dummy" name="sel_levl"></input>
<input type="hidden" value="dummy" name="sel_sess"></input>
<input type="hidden" value="dummy" name="sel_instr"></input>
<input type="hidden" value="dummy" name="sel_ptrm"></input>
<input type="hidden" value="dummy" name="sel_attr"></input>
<table class="dataentrytable" summary="Table is used to present the course search criteria">
<tbody>
<tr>
<td class="delabel" scope="row"> … </td>
<td class="dedefault" colspan="37">
**<select id="subj_id" multiple="" size="10" name="sel_subj"> …
</select>**
</td>
</tr>
</tbody>
</table>
Notice how the select tag and the highlighted input tag have the same name.
The only method that I know is using a variable-name appended with [].
<input type="hidden" value="dummy" name="sel_subj[]"></input>
<input type="hidden" value="ECE" name="sel_subj[]"></input>
This results in an array placed in $_POST['sel_subj'], with $_POST['sel_subj'][0] being "dummy" and $_POST['sel_subj'] being ECE.
Now as I think of it, I think the creation of the array is done by the php-parser when there is a [] attached. This suggests that both values are send through the POST even if there is not [] at the end of the name. Maybe PHP can be configured not to dismiss this values.
In case of GET variables (in the url), you can have multiple values with the same name. You can just parse the entire url and read and use every value.
PHP even solves this automatically if you add [] to the name of the parameter. In that case, it automatically changes it into an array. But this is a trick as well. It is fairly easy to write a piece of code that does the same thing with duplicate names without them having [] as a postfix.
They same will happen post variables as well. You just might need a little more code to read them properly.
The code in this case probably checks if there is sel_subj with any value other than dummy. If that is the case, then that value is used. If it doesn't exists, sel_subj may still exist with the value dummy. That is probably an indication for the script that the form was posted, but no value was selected.
So actually, I think it's quite easy to explain how this script works, and probably even why, but I don't think it's a very good solution to put all defaults in hidden fields this way, so I would suggest you don't try to replicate this solution. :-)
I would like to add simple site search, using Duckduckgo, limited to search only "example.com".
Stackoverflow has solved this, using some JavaScript to add the site:example.com filter to the query.
<form onsubmit="var txt=$(this).find('input[name=\'q\']'); txt.val(txt.val() + ' site:stackoverflow.com');" action="http://www.duckduckgo.com/" method="get" id="duck-duck-go-search">
<input type="text" value="" maxlength="255" size="36" name="q">
<input type="submit" value="DuckDuckGo">
</form>
I'd prefer a solution that does not depend on JavaScript, though.
The URL should be http://duckduckgo.com/?q=site:example.com%20might; the site:example.com must be added to the q= parameter, it seems.
Has anyone found a simple, non JavaScript solution for this?
I contacted DuckduckGo and got a solution from Weinberg himself.
There actually is a hidden sites param :). Try it!
Gabriel, http://ye.gg
It was the plural (not site, but sites) that got me confused, but the solution is very simple:
http://duckduckgo.com/?q=duckduckgo& sites= stackoverflow.com
Or, in a simple HTML form:
<form action="https://duckduckgo.com/" method="get">
<input type="hidden" name="sites" value="stackoverflow.com">
<input type="search" name="q">
<input type="submit" value="Search">
</form>
In a Rails3 app, I want to use resourceful paths for an ActiveModel EntityImage representing image file uploads. In some directory I have these files dir/#{type}/#{id}/#{size}.jpg (which are basically all important fields of that class)
Now, probably, because 'id' is a bad name rails wise (it is not domain wise), when I want to make a delete button, I get a form pointing to:
<form class="button_to" action="/entity_images/test2" method="post">
<div>
<input type="hidden" value="delete" name="_method"/>
<input type="submit" value="Excluir" data-confirm="Certeza?"/>
<input type="hidden" value="4SWGCEfvdrWrj7xBBtlT0CR4EHPzXQaCFWF0/blmKCk=" name="authenticity_token"/>
</div>
</form>
Of course, with this info, I cannot get to my image, I still need to know the type of the entity and the size. How could I make the path helpers do the right thing? Or any other idea, suggestion?
Ok, so I joined the id property from (now) name, type and size and can split that and reconstruct these values