[e] (0) Include an example for how to get the filename out of input.v…

…alue

git-svn-id: http://svn.whatwg.org/webapps@3863 340c8d12-0b0e-0410-8428-c7bf67bfef74

index

 
   </div>
 
+  <div class=example>
+
+   <p>For historical reasons, the <code title=dom-input-value><a href=#dom-input-value>value</a></code> IDL attribute prefixes the
+   filename with the string "<code title="">C:\fakepath\</code>". Some
+   legacy user agents actually included the full path (which was a
+   security vulnerability). As a result of this, obtaining the
+   filename from the <code title=dom-input-value><a href=#dom-input-value>value</a></code> IDL
+   attribute in a backwards-compatible way is non-trivial. The
+   following function extracts the filename in a suitably compatible
+   manner:</p>
+
+   <pre>function extractFilename(path) {<!--
+  if (path.substr(0, 12) == "C:\\fakepath\\")
+    return path.substr(12);-->
+  var x;
+  x = path.lastIndexOf('\\');
+  if (x &gt;= 0) // Windows-based path
+    return path.substr(x+1);
+  x = path.lastIndexOf('/');
+  if (x &gt;= 0) // Unix-based path
+    return path.substr(x+1);
+  return path; // just the filename
+}</pre>
+
+   <p>This can be used as follows:</p>
+
+   <pre>&lt;p&gt;&lt;input type=file name=image onchange="updateFilename(this.value)"&gt;&lt;/p&gt;
+&lt;p&gt;The name of the file you picked is: &lt;span id="filename"&gt;(none)&lt;/span&gt;&lt;/p&gt;
+&lt;script&gt;
+ function updateFilename(path) {
+   var name = extractFilename(path);
+   document.getElementById('filename').textContent = name;
+ }
+&lt;/script&gt;</pre>
+
+   <!-- How useful this actually is... is unclear. -->
+
+  </div>
+
   <hr><div class="bookkeeping impl">
 
    <p>The following common <code><a href=#the-input-element>input</a></code> element content

source

 
   </div>
 
+  <div class="example">
+
+   <p>For historical reasons, the <code
+   title="dom-input-value">value</code> IDL attribute prefixes the
+   filename with the string "<code title="">C:\fakepath\</code>". Some
+   legacy user agents actually included the full path (which was a
+   security vulnerability). As a result of this, obtaining the
+   filename from the <code title="dom-input-value">value</code> IDL
+   attribute in a backwards-compatible way is non-trivial. The
+   following function extracts the filename in a suitably compatible
+   manner:</p>
+
+   <pre>function extractFilename(path) {<!--
+  if (path.substr(0, 12) == "C:\\fakepath\\")
+    return path.substr(12);-->
+  var x;
+  x = path.lastIndexOf('\\');
+  if (x >= 0) // Windows-based path
+    return path.substr(x+1);
+  x = path.lastIndexOf('/');
+  if (x >= 0) // Unix-based path
+    return path.substr(x+1);
+  return path; // just the filename
+}</pre>
+
+   <p>This can be used as follows:</p>
+
+   <pre>&lt;p>&lt;input type=file name=image onchange="updateFilename(this.value)">&lt;/p>
+&lt;p>The name of the file you picked is: &lt;span id="filename">(none)&lt;/span>&lt;/p>
+&lt;script>
+ function updateFilename(path) {
+   var name = extractFilename(path);
+   document.getElementById('filename').textContent = name;
+ }
+&lt;/script></pre>
+
+   <!-- How useful this actually is... is unclear. -->
+
+  </div>
+
   <hr>
 
   <div class="bookkeeping impl">