In my Rails app I've created a set of checkboxes as follows:
<div class="form_row">
<label for="features[]">Features:</label>
<% ['scenarios', 'news', 'role_profiles', 'private_messages', 'chatrooms', 'forums', 'polls'].each do |feature| %>
<br><%= check_box_tag 'features[]', feature, (@features || {}).include?(feature) %>
<%= feature.humanize %>
<% end %>
</div>
I'd like to know how to create a button that would "Select All".
If you use the Prototype JS, you might find this blog post helpful. It gives a fairly concise way to perform a select all.
http://www.ryboe.com/2008/07/10/select-all-checkboxes-with-prototype-js.html
In your view you could use the following snippet to create a "Select All" link:
<%= link_to_function("Select All","checkboxes.each(function(e){ e.checked = 1 })") %>
In addition, you'd need the following Javascript code somewhere on the same page (or maybe even abstracted out to the public/javascripts/application.js file
var checkboxes = [];
checkboxes = $$('input').each(function(e){ if(e.type == 'checkbox') checkboxes.push(e) });
var form = $('options'); /* Replace 'options' with the ID of the FORM element */
checkboxes = form.getInputs('checkbox');
Here's the full source of a working example, if this doesn't work you might need to check to make sure your JS libraries are loading properly.
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<script type="text/javascript" src="http://www.google.com/jsapi" charset="utf-8"></script>
<script type="text/javascript" charset="utf-8">
var checkboxes;
google.load("prototype", "1.6");
google.setOnLoadCallback(function(){
checkboxes = [];
checkboxes = $$('input').each(function(e){ if(e.type == 'checkbox') checkboxes.push(e) });
var form = $('options'); /* Replace 'options' with the ID of the FORM element */
checkboxes = form.getInputs('checkbox');
});
</script>
</head>
<body>
<form id="options">
<fieldset><input type="text" value="test"></fieldset>
<fieldset><input type="checkbox" value=0> 0</fieldset>
<fieldset><input type="checkbox" value=1> 1</fieldset>
<fieldset><input type="checkbox" value=2> 2</fieldset>
<fieldset><input type="checkbox" value=3> 3</fieldset>
</form>
<a href="#" onclick="checkboxes.each(function(e){e.checked = 1})">Select All</a>
</body>
</html>
Using jQuery;
<script type="text/javascript">
function selectAll(){
$("input:checkbox").each(function(){
$(this).attr('checked', true);
return false;
});
}
</script>
HTML button:
<a href="#" onclick="selectAll()">Select All</a>