Ruby on rails data pass to javascript become HTMLDIVELEMENT

Question

I'm trying to pass database value retrieved by ruby to javascript,to handle some div display.

Strange thing is,when I pass number(means I retrieve number from database and pass to js),it works fine,as follow,this load_web is a short int.

if (<%= @device.load_web %>==0)
{ $('.somediv').find('input,textarea,select').attr('disabled',true); }
});

But when I try same method,passing string to js,it returns me HTMLDIVElement,which is very strange.

if(<%= @device.brand%>=="apple")
    {
    alert("apple"); 
    }
    else
    {
    alert(<%= @device.brand %>);
    }

The data in my database for this colum is "apple",but the logic falls into else loop,and give me a "object HTMLDIVElement" message.

Why is so?

EDIT: I try use alert(<%= @device.brand %>.innerHTML); and get the following message:

AJFaraday · Accepted Answer · 2015-08-13 08:56:29Z

1

Remember that erb tags just insert the result of the ruby code in them into your html template. So unless @device.brand is returning some properly formatted javascript (or a number), you probably want to wrap it in strings. Try this:

if("<%= @device.brand%>"=="apple")
    {
    alert("apple"); 
    }
    else
    {
    alert("<%= @device.brand %>");
    }

edited Aug 13, 2015 at 8:56

answered Aug 12, 2015 at 9:40

AJFaraday

2,4581 gold badge20 silver badges42 bronze badges

Sign up to request clarification or add additional context in comments.

4 Comments

Orz Over a year ago

I try change according to your solution,then the whole if statement not executed,neither go if nor else,(previously I go to else state).so I feel its not the quotation marks' problem

AJFaraday Over a year ago

Was there any error messages in your javascript console?

Orz Over a year ago

thank you,Today I try again use " " instead of ' ',it works now!

AJFaraday Over a year ago

I'm sure the choice of quotes does not matter to javascript. Glad it solved your problem.

Collectives™ on Stack Overflow

Ruby on rails data pass to javascript become HTMLDIVELEMENT

1 Answer 1

4 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

4 Comments

Your Answer

Sign up or log in

Post as a guest

Related