How to pass values from hidden_field_tag through link_to params (Rails)

Question

I would like to click on a link and pass in a value from an existing hidden_field_tag (which is updated on multiple occasions in other events) in a simple_form.

Here is some sample code:

= hidden_field_tag :tag_value, "starting_value", id:"tag_id"
...

=link_to "Submit", controller_method_path(value1: @id, value2: **not sure what comes here but should be :tag_value**), remote: true, method: :get

I'm not sure what syntax I should be using to get the value of the hidden tag.

Thanks in advance.

Answer 1

Attach a click event to "submit" and use a mask as value2:

=link_to "Submit", controller_method_path(value1: @id, value2: "#####"),onclick: "change_action()", remote: true, method: :get

Then, write the javascript function to handle the click event:

function change_action() {
    // If your form is unique on the page and it has no id:
    var tag_value = document.getElementById('tag_id').value;
    document.forms[0].action = document.forms[0].action.replace("#####",tag_value);
}