Slider Settings

This gives you the basic operation of a slider - what else can you change?

You can set the max and min values that the slider will return via the max and min properties. You can also set the step size, i.e the amount the slider moves each time using the step property. Finally you can set the orientation using the orientation property.

So, for example, to set up a vertical slider working between 1 and -1 with a step size of 0.1 and a display of the value as the user moves the slider.

The HTML can be as simple as:

<div id="mySliderDiv"> </div>
<br/>
<div id="myText"></div>

 The code is:

$("#mySliderDiv").height(400).width(20);
$("#mySliderDiv").slider({
       max:1, min:-1,
       step:0.1,
       orientation:"vertical",
       slide: function(event, ui) {
               $("#myText").text(ui.value);
              }
});

If you run this then you will see a vertical slider with the current value changing below it as the user moves the slider.

Range Slider

As well as the standard slider you can also implement a range slider - one that has two sliders, allowing the user to setup a max and min for a range.

All you have to do is set the range property to true and then set values to an array giving the max and min properties of the two sliders.

For example

$("#mySliderDiv").width(400).slider({
         range:true,
         values:[25,75],
         max:100,min:0});

creates a slider with two slides ranging between 0 and 100 and one initially set to 25 and the other to 75. You can also have a slider with a fixed max or min by setting the range to "max" or "min"

You can get the values for the sliders using the  values() or value(index) methods. For example

var values=$("#mySliderDiv").slider("values);

returns an array of values.

Changing the Style

You might not be happy with the default style of the slider. To change it all you have is create a new style sheet that applies styles to the standard classes set up by the constructor.

You can find out the classes that are used by examining the slider element using the browser's dev tools:

<div id="mySliderDiv"
  class="ui-slider ui-corner-all ui-slider-horizontal
    ui-widget ui-widget-content">
 <span tabindex="0" class="ui-slider-handle
            ui-corner-all ui-state-default">
 </span>
</div>

From this you can see that to customize the slider handle you need to modify the ui-slider-handle, the ui-state-default or the  ui-corner-all class. The problem is always finding out which one to change.

There is a list of standard CSS class names in the documentation but you cannot always rely on their use, especially in third party widgets. 

You can create complete themed sets of styles using the ThemeRoller where you will also find predefined styles you can use.

If you want to do something radical to the slider handle then the best approach is to just use jQuery to remove the assigned styles and apply your own.

More jQuery UI

Now that you have seen how jQuery UI works you can explore the range of components it offers. They all work in more or less the same way as the slider with, of course, features specific to their functioning. You can use jQuery UI to create pages that have tabs or accordion sliding tabs. You can use it to implement popup dialog boxes to get data from the user.  There are also many more animation options provided by jQuery UI than just basic jQuery. There are also functions that will implement drag-and-drop on any HTML element.

To cover everything in jQuery Ui would take another book. However what you know of the slider widget and jQuery should take you a long way. In the next chapter we tackle a more advanced topic - adding a widget to jQuery UI. Your knowledge of jQuery makes it easy for you to create your own custom widgets but it is so much better to add them to jQuery UI. 

 

 Available as a Book:

buy from Amazon

1. Understanding jQuery
2. Basic jQuery CSS Selectors
      Extract: The DOM
3. More Selectors
      Extract: Basic Selectors
4. The JQuery Object
5. Filters 
6. DOM Traversal Filters 
7. Modifying DOM Objects
      Extract: Modifying The DOM 
8. Creating Objects & Modifying The DOM Hierarchy
   
9. Working With Data
      Extract: Data ***NEW!!!
10. Forms 
11. Function Queues
12. Animation 
13. jQuery UI
14. jQuery UI Custom Control
15. Easy Plugins 
16. Testing With QUnit
17. Epilog A Bonus Function

Also Available:

buy from Amazon

 

JavaScript Canvas - Fetch API Working with lower-level data is very much part of graphics. This extract from Ian Elliot's book on JavaScript Graphics looks at how to use typed arrays to access graphic data. + Full Story

JavaScript Jems - The Inheritance Tax JavaScript should not be judged as if it was a poor version of the other popular languages - it isn't a Java or a C++ clone. It does things its own way.  In particular, it doesn't do inheritance  [ ... ] + Full Story

Other Articles JavaScript Jems - Objects Are Anonymous Singletons JavaScript Canvas - Typed Arrays JavaScript Jems - Functions Are Objects Just jQuery The Core UI - Data JavaScript Jems - Lambda Expressions Just jQuery The Core UI - Easy Plugins JavaScript Async - Basic Worker Just jQuery The Core UI - Animation

To be informed about new articles on I Programmer, sign up for our weekly newsletter, subscribe to the RSS feed and follow us on Twitter, Facebook or Linkedin.

 

Comments

Make a Comment or View Existing Comments Using Disqus

or email your comment to: comments@i-programmer.info

JavaScript Canvas - Fetch API Working with lower-level data is very much part of graphics. This extract from Ian Elliot's book on JavaScript Graphics looks at how to use typed arrays to access graphic data. + Full Story

JavaScript Jems - The Inheritance Tax JavaScript should not be judged as if it was a poor version of the other popular languages - it isn't a Java or a C++ clone. It does things its own way.  In particular, it doesn't do inheritance  [ ... ] + Full Story

Other Articles JavaScript Jems - Objects Are Anonymous Singletons JavaScript Canvas - Typed Arrays JavaScript Jems - Functions Are Objects Just jQuery The Core UI - Data JavaScript Jems - Lambda Expressions Just jQuery The Core UI - Easy Plugins JavaScript Async - Basic Worker Just jQuery The Core UI - Animation