I have this piece of Javascript codes in my view file:

<script>
function hint() {
    var str = @user.name;
    var name = str.toLowerCase();

    alert(name);
}
</script>

I want the alert box to display the name of the user so I use the variable @user that was defined in my controller. However, when I click the button to active the alert box, nothing shows up. I also tried current_user.name, but it didn't work either. How can I display the value of a variable in the alert box?

I have this piece of Javascript codes in my view file:

<script>
function hint() {
    var str = @user.name;
    var name = str.toLowerCase();

    alert(name);
}
</script>

I want the alert box to display the name of the user so I use the variable @user that was defined in my controller. However, when I click the button to active the alert box, nothing shows up. I also tried current_user.name, but it didn't work either. How can I display the value of a variable in the alert box?

• javascript
• ruby-on-rails
• ruby-on-rails-3

Share Follow asked May 28, 2016 at 16:18 MarcoMarco 14155 silver badges1414 bronze badges

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3 Answers 3

Sorted by: Reset to default 3

Just keep it like this, as like in html file.

 var str = '<%= @user.name %>';

You can also do like this:

alert("<%= @user.name.downcase %>");

If you have a button then you don't have to write any JavaScript code (assuming a confirmation dialog works for you). You can display a confirmation dialog with data: {confirm: "#{@user.name.downcase}"} passed to your button/submit/link_to helpers:

<%= f.submit 'Save', data: { confirm: "#{@user.name.downcase}" } %>

In addition, it gives you an ability to cancel your button/link click.

Another option without JavaScript is to use onclick event on the button/link:

<%= f.submit 'Save', onclick: "alert('#{@user.name.downcase}');" %>

or pass user name as a parameter to your JavaScript function:

<%= f.submit 'Save', onclick: "your_function('#{@user.name.downcase}');" %>