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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" "http://www.w3.org/TR/1998/REC-html40-19980424/loose.dtd">
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>E</title>
<link rel="stylesheet" href="../doc.css" type="text/css">
</head>
<body>
<h1>E</h1>
<dl>
<dt><a name="+Edit"><code>+Edit</code></a>
<dd>Lock/Edit button prefix class used to gain or release exclusive write
access to an object. See also <a href="refR.html#+Rid">+Rid</a>, <a
href="refF.html#+Force">+Force</a> and <a href="refT.html#+Tip">+Tip</a>.
</dl>
<dl>
<dt><a name="+E/R"><code>+E/R</code></a>
<dd>Connects GUI elements to database entities. Like its parent class,
<code>+/R</code>, <code>+E/R</code> takes a relation specification argument:
<pre><code>
(gui '(+E/R +TextField) '(text : home obj) 40 4)
</code></pre>
This example created a textarea, 40 x 4, and connects it to the 'text'-
property of the current form object. See also <a
href="refR.html#+/R">+/R</a>, <a href="../app.html#linkage">data
linkage</a>.
</dl>
<dl>
<dt><a name="editButton"><code>(editButton Able Exe)</code></a>
<dd>A function creating an "Edit" button. Takes one argument, "Able",
deciding if the button should be clickable or not and one optional
<code>Exe</code> argument that is run when clicking the button. This button
locks the form object and makes the form editable by the current user.
Another user trying to edit the same object at the same time will receive an
error message. Here is an example from the code running the PicoLisp wiki,
in doc.l.
<pre><code>
(editButton '(may Wiki) '(_newMup))
</code></pre>
<code>'(may Wiki)</code> makes sure that this page is only editable by users
having a permission called "Wiki" and <code>'(_newMup)</code> is a function
to be run when someone clicks the button. See also <a
href="refA.html#+AO">+AO</a>, <a href="refF.html#+Focus">+Focus</a>, <a
href="refE.html#+Edit">+Edit</a>, <a href="refB.html#+Button">+Button</a>.
</dl>
<dl>
<dt><a name="+Enum"><code>+Enum</code></a>
<dd>A prefix taking a list of items (e.g. strings for a '+TextField') which
are mapped to sequential numbers.
</dl>
<dl>
<dt><a name="error"><code>(error Exe)</code></a>
<dd>Can be called in a button action to signal an error to the user. The
message is displayed near the offending field. See also <a
href="refB.html#+Button">+Button</a>.
</dl>
<dl>
<dt><a name="expires"><code>(expires)</code></a>
<dd><code>expires</code> shows when the current session expires. If
Javascript is enabled and <code><ping></code> is called in the GUI top
level, the session will never expire. In that case, this function is not
needed.
</dl>
</body>
</html>
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