coffeescript - Dynamically insert ruby generated HTML -

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i have form user can elect create more input areas (to provide more information). have link user click on , form inputs created. i'd use rails form helpers don't have write html myself. i've tried inserting form helpers directly coffeescript , saving outputted html data tag on link, can't coffeescript execute ruby code , i'm having escaping issues data attribute.

here's form:

= simple_form_for([@site, @zone]) |f|   = f.error_notification    .form-inputs     = f.input :site_id      = label_tag "x"     = text_field_tag 'x_coords[]'      = label_tag "y"     = text_field_tag 'y_coords[]'      = label_tag "x"     = text_field_tag 'x_coords[]'      = label_tag "y"     = text_field_tag 'y_coords[]'      = label_tag "x"     = text_field_tag 'x_coords[]'      = label_tag "y"     = text_field_tag 'y_coords[]'      = link_to "add point", "#", id: "add_point", data: { fields: label_tags }    .form-actions     = f.button :submit

when user clicks "add point" link, i'd add block of:

= label_tag "x" = text_field_tag 'x_coords[]'  = label_tag "y" = text_field_tag 'y_coords[]'

label_tags in application_helper.rb:

def label_tags   label_tag "z" end

the problem output "add point" link is:

<a href="#" data-fields="<label for=" z"="">z" id="add_point"&gt;add point</a>

and quotation marks causing link come out text: "z" id="add_point">add point"

i got data attribute idea screencast

you cannot execute ruby code javascript. when page requested embedded ruby evaluated , results get. issue can see paste label block in right data attribute it's not escaped.

what you'll need escape quotes on generated html going field , unescape them via javascript. use html_escape here like: data: { fields: h(label_tags) } (h alias html_escape or yourself, manually.

def escape(str)   str.gsub(/</, "&lt;").gsub(/>/, "&gt;").gsub(/"/, "&quot;") end  # later in view form data: { fields: escape(label_tags) }

and coffeescript click handler like:

function unescape(str) {   return str.replace(/((?:&lt;)|(?:&gt;)|(?:&quot;))/g, function($1) {      switch($1) {       case "&gt;":         return ">";       case "&lt;":         return "<";       case "&quot;":         return '"';     }   }); }  $("a").on("click", function() {   var html = unescape(this.data("fields"));   $(".the-place-to-put-it").html(html); });

i not doubt better solution exists , of posting of answer have not tested work (in theory should). ideally, should generate elements jquery in javascript , not depend on method doing - yes, it's duplicate code duplicated between ruby , coffee.


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