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Q&A

How to call a function from ruby-on-rails (HTML)?

+1
−3

Let I have a button

<button type="button" onclick = "myfunction()" class="collapsible">Expand content</button>

And, I have a JS function.

function collapse() {
    var coll = document.getElementsByClassName("collapsible");
    var i;

    for (i = 0; i < coll.length; i++) {
        coll[i].addEventListener("click", function() {
            this.classList.toggle("active");
            var content = this.nextElementSibling;
            if (content.style.display === "block") {
                content.style.display = "none";
            } else {
                content.style.display = "block";
            }
        });
    }
}

Usually, we call a JS function in HTMl using onclick. What if it comes to Ruby-on-rails? I noticed that I can't call a function that way in Ruby-on-rails. How to call a function from ruby-on-rails (HTML)?

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2 comment threads

What exactly do you want to achieve? (I am not asking how you want to achive it) (7 comments)
Same question asked on Stack Overflow. (3 comments)

1 answer

+1
−1

Hope I understood what do you mean. I guess for example you have app.js (which contains your JavaScript function) and app.html.erb (which you want to call JavaScript function from).

OK. In your app.html.erb:

<%= javascript_include_tag('app.js') %>
<%= button_tag "Test", id: "TestBTN" %>

As you seen above, first I linked our Ruby HTML file to our nice JavaScript file then I have made a simple button and I added an ID to it (which is TestBTN) to check onclick from our JavaScript funtion.

Then in your app.js:

document.getElementById("TestBTN").addEventListener("click", function() {
  console.log("Done!");
}); 

As seen above, I have made an EventListener for our button and onclick it will print "Done!" in the console.

Hope this helps!

More about javascript_include_tag.

More about button_tag.

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1 comment thread

TypeError (2 comments)

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