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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>O</title>
<link rel="stylesheet" href="../doc.css" type="text/css">
</head>
<body>
<h1>O</h1>
<dl>
<dt><a name="+obj"><code>+obj</code></a>
<dd><code>+obj</code> is a base class used to turn a DB object into a first
class GUI item. See <a href="refO.html#+Obj">+Obj</a>, <a
href="refO.html#+ObjView">+ObjView</a> and <a
href="refO.html#+ObjVal">+ObjVal</a>.
</dl>
<dl>
<dt><a name="+Obj"><code>+Obj</code></a>
<dd>Holds an object, like a '+NumField' holds (i.e. converts, checks etc. )
a number or a '+DateField' holds a date and so on. This way, a DB object
becomes a first class GUI item just like the primitives string, number etc.
In addition, <code>+Obj</code>supplies suggestions from the database, using
<code>dbHint</code>.
<pre><code>
(gui '(+E/R +Obj +TextField) '(pa : home obj) '(nm +Man) 30)
</code></pre>
Here, the <code>+TextField</code> is connected to the 'pa'- property of the
current form object. Since we are using <code>+Obj</code> in combination
with <code>+TextField</code>, the database will suggest names from the 'nm'-
property of the class <code>+Man</code>. See also <a
href="refN.html#+NumField">+NumField</a>, <a
href="refD.html#+DateField">+DateField</a>, <a
href="refD.html#dbHint">dbHint</a>, <a href="refH.html#+hint">+hint</a>, <a
href="refO.html#+obj">+obj</a>.
</dl>
<dl>
<dt><a name="+ObjView"><code>+ObjView</code></a>
<dd>Similar to <code>+Obj</code>, but not editable (view-only). Therefore it
is free to display an arbitrary attribute of an object, or even the result
of an arbitrary formatting expression, while still allowing to click on it
and jump to the object's GUI form, as determined by the url>- method (or
a custom method supplied as an optional argument to <code>+ObjView</code>.
Such an optional method is accepted by all subclasses of <code>+obj</code>).
A common use of <code>+ObjView</code> is when presenting data in a
<code>chart</code>. Given the following 'put'- function:
<pre><code>
'((This) (list This This (: pa) (: ma) (: mate) (: job) (: dat)))
</code></pre>
The data can be displayed with the following table:
<pre><code>
(<table> 'chart NIL
'((btn) (NIL "Name") (NIL "Father") (NIL "Mother") (NIL "Partner") (NIL "Occupation") (NIL "born"))
(do (cho)
(<row> (alternating)
(gui 1 '(+DstButton) Dst)
(gui 2 '(+ObjView +TextField) '(: nm))
(gui 3 '(+ObjView +TextField) '(: nm))
(gui 4 '(+ObjView +TextField) '(: nm))
(gui 5 '(+ObjView +TextField) '(: nm))
(gui 6 '(+TextField))
(gui 7 '(+DateField)) ) ) )
</code></pre>
Columns 2, 3 and 4 use <code>+ObjView</code> to display the name of the 'pa',
'ma' and 'mate' relations of the current object respectively. See also <a
href="refO.html#+Obj">+Obj</a>, <a href="refO.html#+obj">+obj</a>.
</dl>
<dl>
<dt><a name="+ObjVal"><code>+ObjVal</code></a>
<dd>Like <code>+Obj</code>, but automatically creates a new object if one
does not exist and an attribute value is entered into a field. See also <a
href="refO.html#+Obj">+Obj</a>, <a href="refO.html#+obj">+obj</a>.
</dl>
<dl>
<dt><a name="+OnClick"><code>+OnClick</code></a>
<dd>A prefix class used in combination with +Button. +OnClick takes
javascript code as an argument. This code is then executed by the browser
when the button is clicked. A short example would look like this:
<pre><code>
(gui '(+OnClick +Button) "alert('OK')" "Alert")
</code></pre>
The <a href="http://picolisp.com">PicoLisp wiki</a> includes a <a
href="http://picolisp.com/wiki/?OnClickButton">good article</a> that
explains +OnClick in depth. See also <a href="refB.html#+Button">+Button</a>
and <a href="refG.html#gui">gui</a>.
</dl>
<dl>
<dt><a name="okButton"><code>(okButton 'Exe)</code></a>
<dd>A button with the label "Ok". If 'Exe' is passed in, the button uses the
prefix classes +Force and +Close, otherwise only +Close is used. See also <a
href="refF.html#+Force">+Force</a>, <a href="refC.html#+Close">+Close</a>,
<a href="refB.html#+Button">+Button</a> and <a href="refG.html#gui">gui</a>.
</dl>
</body>
</html>
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