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Adding Model#has to Backbone...

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This commit is contained in:
Jeremy Ashkenas
2010-12-08 12:23:17 -05:00
parent b73fc46437
commit 0c1bbbcc97
3 changed files with 47 additions and 38 deletions
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7
backbone.js
View File

@@ -158,9 +158,10 @@
return this._escapedAttributes[attr] = escapeHTML(val == null ? '' : val);
},
// Returns true if the attribute evalutates to a truthy value. False otherwise.
is : function(attr) {
return !!this.attributes[attr] === true;
// Returns `true` if the attribute contains a value that is not null
// or undefined.
has : function(attr) {
return this.attributes[attr] != null;
},
// Set a hash of model attributes on the object, firing `"change"` unless you

57
index.html
View File

@@ -167,9 +167,9 @@
<li>– <a href="#Model-extend">extend</a></li>
<li>– <a href="#Model-constructor">constructor / initialize</a></li>
<li>– <a href="#Model-get">get</a></li>
<li>– <a href="#Model-escape">escape</a></li>
<li>– <a href="#Model-is">is</a></li>
<li>– <a href="#Model-set">set</a></li>
<li>– <a href="#Model-escape">escape</a></li>
<li>– <a href="#Model-has">has</a></li>
<li>– <a href="#Model-unset">unset</a></li>
<li>– <a href="#Model-clear">clear</a></li>
<li>– <a href="#Model-id">id</a></li>
@@ -543,29 +543,6 @@ new Book({
<tt>note.get("title")</tt>
</p>
<p id="Model-escape">
<b class="header">escape</b><code>model.escape(attribute)</code>
<br />
Similar to <a href="#Model-get">get</a>, but returns the HTML-escaped version
of a model's attribute. If you're interpolating data from the model into
HTML, using <b>escape</b> to retrieve attributes will prevent
<a href="http://en.wikipedia.org/wiki/Cross-site_scripting">XSS</a> attacks.
</p>
<pre class="runnable">
var hacker = new Backbone.Model({
name: "&lt;script&gt;alert('xss')&lt;/script&gt;"
});
alert(hacker.escape('name'));
</pre>
<p id="Model-is">
<b class="header">is</b><code>model.is(attribute)</code>
<br />
Returns whether an attribute is set to a truthy value or not. For example:
<tt>note.get("title")</tt>
</p>
<p id="Model-set">
<b class="header">set</b><code>model.set(attributes, [options])</code>
@@ -589,6 +566,36 @@ note.set({title: "October 12", content: "Lorem Ipsum Dolor Sit Amet..."});
callback in the options, which will be invoked instead of triggering an
<tt>"error"</tt> event, should validation fail.
</p>
<p id="Model-escape">
<b class="header">escape</b><code>model.escape(attribute)</code>
<br />
Similar to <a href="#Model-get">get</a>, but returns the HTML-escaped version
of a model's attribute. If you're interpolating data from the model into
HTML, using <b>escape</b> to retrieve attributes will prevent
<a href="http://en.wikipedia.org/wiki/Cross-site_scripting">XSS</a> attacks.
</p>
<pre class="runnable">
var hacker = new Backbone.Model({
name: "&lt;script&gt;alert('xss')&lt;/script&gt;"
});
alert(hacker.escape('name'));
</pre>
<p id="Model-has">
<b class="header">has</b><code>model.has(attribute)</code>
<br />
Returns <tt>true</tt> if the attribute is set to a non-null or non-undefined
value.
</p>
<pre>
if (note.has("title")) {
...
}
</pre>
<p id="Model-unset">
<b class="header">unset</b><code>model.unset(attribute, [options])</code>

21
test/model.js
View File

@@ -104,18 +104,19 @@ $(document).ready(function() {
equals(doc.escape('audience'), '');
});
test("Model: is", function() {
attrs = { 'foo': 1 };
test("Model: has", function() {
attrs = {};
a = new Backbone.Model(attrs);
// falsiness
_([false, null, undefined, '', 0]).each(function(value) {
a.set({'foo': value});
equals(a.is("foo"), false);
equals(a.has("name"), false);
_([true, "Truth!", 1, false, '', 0]).each(function(value) {
a.set({'name': value});
equals(a.has("name"), true);
});
// truthiness
_([true, "Truth!", 1]).each(function(value) {
a.set({'foo': value});
equals(a.is("foo"), true);
a.unset('name');
equals(a.has('name'), false);
_([null, undefined]).each(function(value) {
a.set({'name': value});
equals(a.has("name"), false);
});
});