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<script type="text/javascript">  var _URL = window.URL || window.webkitURL;  $('#structure_product_image').on('change', function() { //pass here file field id    var image, file;    if ((file = this.files[0])) {      image = new Image();      image.onload = function() {        $("#error_message").text("");        if (this.width <= 700) {          $("#error_message").text("Width should be greater than 700 pixel!") //id where you want to display text        }        else if (this.height <= 600){          $("#error_message").text("Height should be greater than 600 pixel!")        }        else if (this.height >= this.width){          $("#error_message").text("Height should not be greater than Width")        }        if($("#error_message").text() == ""){          $("#save_product").prop("disabled" , false)      

Click on button for generate pdf  $("#print_selected_label").on("click", function(){    data = []    $("input:checkbox.print_label:checked").each(function(){      data.push($(this).attr("id"));    });   //getting all information of checked checkbox    if(data.length > 0){    // if data is not null       In angular js controller         // var redirect_new = "/admin/v2/orders/print_multiple_label.pdf?" + jQuery.param(data);        // var pdf = window.open(redirect_new, 'Map PDF', '');      By Creating a link by javascript       // var mydiv = document.getElementById("download_pdf");      // var aTag = document.createElement('a');      // var link = " admin/v2/orders/print_multiple_label.pdf?id="+data ;      // aTag.setAttribute('href',link);      // aTag.innerHTML = "link text";      // mydiv.appendChild(aTag);      // aTag.click(); By making http request    

How to customise active admin page on keypress First make new route for getting filtered data: get '/admin/gyms/search_user', :to => 'admin/gyms#search_user', as: :search_gym_user In your controller create new method def search_user      @user =  User.where("name = ? AND role = ?", params[:name], "none") if params[:name].present?      respond_to do |format|        format.json  { render :json => @user }      end    end Render partial and add a id to to table panel "Gym Users:", :id => "foo-panel" do      # renders app/views/admin/posts/_search_users.html.erb       render 'search_users', { users: gym.users }      table_for gym.users, id: "search_gym_user" do        # binding.pry        # filter :"name" , :as => :select, :collection => gym.users.pluck(:name)        column "Joined" do |user|          distance_of_time_in_words(user.created_at, Time.now)