Get rails variables as parameter to an onclick event function

Question

I'm trying to do something: I have a event listener to call a function when a button is clicked (there is a dynamic amount of them), but I would like to pass an additionnal argument to the function depending, which would be a parameter defined in my controller.

Do you have any clue about how I could achieve that?

Christian Benseler · Accepted Answer · 2014-07-30 10:18:01Z

4

What you can do is set a data-* field in your html with the value from this "variable" set in the controller and inside the javascript function, get this.

For example, an .html.erb

<button id="my_id" data-myvalue="<%= $my_value %>">click me</button>

Javascript:

document.getElementById("my_id").onclick = function() {
console.log(this.getAttribute("data-myvalue"));
}

answered Jul 30, 2014 at 10:18

Christian Benseler

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1 Comment

Richard Peck Over a year ago

Further to this, you must remember that Rails is a back-end infrastructure, meaning you can only "call" Rails data on your front-end if you explicitly set it at render time. To do this, you need to make sure you can set the Rails-centric data in your controller backend, to render in the view (IE - you cannot just "pass" Rails data to your browser -- it has to go through the view / HTML) To do this, you basically need to output the Rails data (from Chris' example the data attributes) to make sure your HTML view can output the required information

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