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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>I</title>
<link rel="stylesheet" href="../doc.css" type="text/css">
</head>
<body>
<h1>I</h1>
<dl>
<dt><a name="<id>"><code>(<id> )</code></a>
<dd>Sets the object passed to a form in the '*ID' global via the URL into
the form's 'obj' property. Takes care of handling enable/disable, locking,
and displaying the object's name or similar property. Usually called in a
HTML '<hN>' tag, or implicitly in 'idForm'. See also <a
href="refI.html#idForm">idForm</a>.
</dl>
<dl>
<dt><a name="idForm"><code>(idForm Entity Cho Var Cls Able Del Lst . Prg)</code></a>
<dd><code>idForm</code> is used to display and edit objects in the system.
Here is an example from the demo application included with the PicoLisp
distribution, in item.l:
<pre><code>
(menu ,"Item"
(idForm ,"Item" '(choItem) 'nr '+Item T '(may Delete) '((: nr) " -- " (: nm))
(<grid> 4
,"Number" NIL (gui '(+E/R +NumField) '(nr : home obj) 10) NIL
,"Description" NIL (gui '(+E/R +Cue +TextField) '(nm : home obj) ,"Item" 30) NIL
,"Supplier" (choCuSu 0)
(gui '(+E/R +Obj +TextField) '(sup : home obj) '(nm +CuSu) 30)
(gui '(+View +TextField) '(field -1 'obj 'ort) 30)
,"Inventory" NIL (gui '(+E/R +NumField) '(inv : home obj) 12)
(gui '(+View +NumField) '(cnt> (: home obj)) 12)
,"Price" NIL (gui '(+E/R +FixField) '(pr : home obj) 2 12) )
(--)
(<grid> 2
,"Memo" (gui '(+BlobField) '(txt : home obj) 60 8)
,"Picture"
(prog
(gui '(+Able +UpField) '(not (: home obj jpg)) 30)
(gui '(+Drop +Button) '(field -1)
'(if (: home obj jpg) ,"Uninstall" ,"Install")
'(cond
((: home obj jpg)
(ask ,"Uninstall Picture?"
(put!> (: home top 1 obj) 'jpg NIL) ) )
((: drop) (blob! (: home obj) 'jpg @)) ) ) ) )
(<spread> NIL (editButton T))
(gui '(+Upd +Img)
'(and (: home obj jpg) (allow (blob (: home obj) 'jpg)))
,"Picture" ) ) )
</code></pre>
The first argument to <code>idForm</code> is used to create a header, in our
case "Item". This is followed by <code>'choItem()</code>, which is a search
function. This allows us to use both search and edit functionality from the
same page. Then we have two arguments, <code>'nr '+Item</code> used to count
how many objects of a certain type is in the database. <p>The <code>T</code>
argument that follows decides whether a user can edit objects in this form
or not. Next up is <code>'(may Delete)</code>, checking if the current user
has permission to delete objects. Finally, the list <code>'((: nr) "--" (:
nm))</code> is passed to the <code>idForm</code> function. This is used to
create a heading that is displayed when a single object has been selected.
Our example will use the 'nr' and 'nm' properties of an <code>+Item</code>
object combined with " -- ". The result is something like this: "Item: 2 --
Spare Part". </p> See also <a href="refD.html#diaform">diaform</a>, <a
href="refF.html#form">form</a>.
</dl>
<dl>
<dt><a name="+Icon"><code>+Icon</code></a>
<dd>This class is somewhat similar to <a href="refI.html#+Img">+Img</a>, but
is more dynamic. +Icon takes an 'exe' which can be used to show different
icons depending on the situation.
</dl>
<dl>
<dt><a name="+Img"><code>+Img</code></a>
<dd>Image form field. This field can take 4 arguments that affect the
resulting html. These arguments are <code>Alt</code>, <code>Url</code>,
<code>Dx</code> and <code>Dy</code>.
<pre><code>
(gui '(+Upd +Img)
'(and (: home obj jpg) (allow (blob (: home obj) 'jpg)))
,"Picture" "http://picolisp.com" 35 55) ) )
</code></pre>
<code>Alt</code>, <code>Dx</code> and <code>Dy</code> all set properties in
the resulting img tag:
<pre><code>
<img src="..." alt="Picture" width="35" height="55 id=".." />
</code></pre>
Adding a <code>Url</code> argument turns the resulting image into a link:
<pre><code>
<a href="http://picolisp.com"><img src="..." alt="Picture" width="35" height="55 id=".."/></a>
</code></pre>
See also <a href="refG.html#+gui">+gui</a> and <a
href="refU.html#+Upd">+Upd</a>.
</dl>
<dl>
<dt><a name="+Init"><code>+Init</code></a>
<dd>Prefix class used to give an initial value to a GUI component. Takes an
expression to give the field an initial value.
<pre><code>
(gui '(+Init +TextField) "Initial value" 30)
</code></pre>
</dl>
<dl>
<dt><a name="+InsRowButton"><code>+InsRowButton</code></a>
<dd>This button inserts a new, empty, row in a chart. See also <a
href="refT.html#+Tiny">+Tiny</a>, <a href="refJ.html#+JS">+JS</a>, <a
href="refA.html#+Able">+Able</a>, <a href="refT.html#+Tip">+Tip</a>, <a
href="refB.html#+Button">+Button</a>.
</dl>
</body>
</html>
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