Book Image

jQuery HOTSHOT

By : Dan Wellman
Book Image

jQuery HOTSHOT

By: Dan Wellman

Overview of this book

jQuery is used by millions of people to write JavaScript more easily and more quickly. It has become the standard tool for web developers and designers to add dynamic, interactive elements to their sites, smoothing out browser inconsistencies and reducing costly development time.jQuery Hotshot walks you step by step through 10 projects designed to familiarise you with the jQuery library and related technologies. Each project focuses on a particular subject or section of the API, but also looks at something related, like jQuery's official templates, or an HTML5 feature like localStorage. Build your knowledge of jQuery and related technologies.Learn a large swathe of the API, up to and including jQuery 1.9, by completing the ten individual projects covered in the book. Some of the projects that we'll work through over the course of this book include a drag-and-drop puzzle game, a browser extension, a multi-file drag-and-drop uploader, an infinite scroller, a sortable table, and a heat map. Learn which jQuery methods and techniques to use in which situations with jQuery Hotshots.
Table of Contents (18 chapters)
jQuery HOTSHOT
Credits
Foreword
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Factoring in weights


We now have two addresses – the start and end markers for the journey. All the visitor needs to do now is enter a weight and we'll be able to calculate and display the distance and cost.

Engage Thrusters

All we need to do in this task is add a handler for the <input> element in the UI area so that once a weight is entered the <button> becomes clickable. We can achieve this with the following code, which can be added directly after the markerDrag() function from the previous task:

$("#weight").on("keyup", function () {
    if (timeout) {
        clearTimeout(timeout);
    }

    var field = $(this),
        enableButton = function () {
            if (field.val()) {
                $("#getQuote").removeProp("disabled");
            } else {
                $("#getQuote").prop("disabled", true);
            }
        },
        timeout = setTimeout(enableButton, 250);
});

Objective Complete - Mini Debriefing

We can add the event handler for the user-generated keyup...