selected value of f..select lost after page refresh in ruby on rails -


i have dropdown in ruby on rails i.e below:

<table> <tr>    <td align="center">       <%= f.select(:interest,options_from_collection_for_select(@students, "id", "student_mentor_subjects"), {},:id => "ddl_students", :style => "width:160px;") %>    </td> </tr> </table>

and students table populating f.select , below schema of students table:

id | student_mentor_subjects 1  | ijk 2  | mno 3  | pqr

and when select value above f.select , click on search button page refresh , selected value lost, how retain selected value of f.select after page refresh. kindly me, thanks.

from api:

http://api.rubyonrails.org/classes/actionview/helpers/formoptionshelper.html#method-i-options_from_collection_for_select

options_from_collection_for_select(collection, value_method, text_method, selected = nil)

the fourth argument options_from_collection_for_select default value. in case need set params, fall specific default if there's nothing in params (which case when load page first time).

i don't know value read params you've not posted rest of form, if in log should see value want read. so, might 

      <%= f.select(:interest,options_from_collection_for_select(@students, "id", "student_mentor_subjects", params[:search][:interest] || @students.first.id), {},:id => "ddl_students", :style => "width:160px;") %>

Comments

Post a Comment

Popular posts from this blog

get url and add instance to a model with prefilled foreign key :django admin -

Image
i have page in each contest shown in row. each row contains contest id , link other model names have foreign key contest. news model: class news(models.model): title = models.charfield(max_length=50, null=true) description = models.textfield() time = models.timefield( default= datetime.datetime.now().time()) contest = models.foreignkey(contest) i want use admin adding , changing these models. want when user clicks on 'news' has foreign key contest id=1, shows list of news value foreign key. use {% instance in instances %} <tr class="{% cycle 'row1' 'row2' %}"> <td>{{ instance.title }}</td> <td>{{ instance.starttime }}</td> <td>{{ instance.timespan }}</td> <td>{{ instance.date }}</td> <td><a href="/adm...
Read more

android - Keyboard hides my half of edit-text and button below it even in scroll view -

i having trouble keyboard covers edit-text , half of button in scroll view. here's layout , please tell me how should resolve problem. many questions on topic none of them s working me. <?xml version="1.0" encoding="utf-8"?> <linearlayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:background="@drawable/bg" android:layout_height="match_parent"> <scrollview android:layout_width="match_parent" android:fillviewport="true" android:layout_height="match_parent"> <relativelayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical"> <linearlayout android:layout_width="match_parent" android:layout_height="w...
Read more

css - Make div keyboard-scrollable in jQuery Mobile? -

from can tell, although jquery-mobile-powered pages can contain divs overflow set scroll or auto, , these divs can scrolled one-screen bar or mouse wheel, cannot scrolled using arrow keys, page-up/page-down, or home/end. instead, official "page" div (with data-role="page") absorbs input. perhaps other divs can't acquire focus, i'm not sure. is there way around this? edit: jsfiddle of simple example: https://jsfiddle.net/qogz0shx/ <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script> <script src="https://ajax.googleapis.com/ajax/libs/jquerymobile/1.4.5/jquery.mobile.min.js"> </script> <link rel="stylesheet" href="https://code.jquery.com/mobile/1.4.5/jquery.mobile-1.4.5.css"/> <style> #outer { overflow:scroll; height: 50vh; width: 50vw; } #inner { height: 500vh; width: 500vw; } ...
Read more