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<html>
<!--
Javascript Konsole (c) 2001 Till Krech <till@snafu.de>
Dieser Code unterliegt den Bedingungen der Gnu Public License Version 2.
-->
<head>
<title>Javascript Konsole</title>
<style type="text/css">
code {
color:#444488;
}
em {
font-weight: bold;
}
</style>
<script language="JavaScript">
function do_eval() {
var fo = document.forms.fo;
fo.restyp.value = "";
fo.field.value = "";
var fo = document.fo;
var expr = fo.zeile.value;
var result = eval(expr);
fo.restyp.value = typeof(result);
var tuedel = "";
if (typeof(result) == "string") {
tuedel = '"';
}
fo.field.value = tuedel + result + tuedel;
}
function do_properties() {
var fo = document.forms.fo;
fo.restyp.value = "";
fo.field.value = "";
var fo = document.fo;
var expr = fo.zeile.value;
var result = eval(expr);
var i;
fo.restyp.value = typeof(result);
var fieldvalue = "";
if (typeof(result) != "undefined") {
for (i in result) {
var tuedel = "";
var propval = result[i];
if (typeof(propval) == "string") {
tuedel = '"';
}
fieldvalue +=
i
+ " [" + typeof(propval) + "] = "
+ tuedel + propval + tuedel + "\n";
}
fo.field.value = fieldvalue;
}
}
</script>
</head>
<body bgcolor="#dddddd">
<h1>JavaScript Konsole</h1>
<form name="fo">
<table bgcolor="#cccccc" cellspacing="1" cellpadding="8">
<tr bgcolor="#ffeeee"><th height="40" align="right">Expression</th><td><input name="zeile" type="text" size="60"></td></tr>
<tr bgcolor="#eeeeee"><th align="right">Result Type</th><td><input name="restyp" readonly type="text" size="60"></td></tr>
<tr bgcolor="#eeeeee"><th align="right">Result(s)</th><td><textarea readonly name="field" rows="10" cols="60"></textarea></td></tr>
<tr bgcolor="#ffeeee"><td> </td><td>
<input type="button" value="list properties" onclick="do_properties()">
<input type="button" value="evaluate" onclick="do_eval()">
<input type="reset" value="clear fields"
</td></tr>
</table>
</form>
<h2>Explanation</h2>
<h3>Operation</h3>
<blockquote>
When <em>evaluate</em> is pressed, the given expression is evaluated and the result is displayed in the result(s) field.
In case of <em>list properties</em> being pressed, the result of the expression is taken as an object
and the objects properties are displayed with their type and value in the the result(s) field.
</blockquote>
<h3>Expression</h3>
<blockquote>
Expression must be a valid javascript expression, e.g.<br><code>window</code>
<br>or<br><code>document.body.innerHTML</code><br>or<br>
<code>"Today: " + (new Date()).toString()</code><br>
or<br>
<code>"Cablecar".match(/ab.*c/)</code>
<br>It is also possible to assign a value,
e.g.<br><code>document.getElementsByTagName('H1').item(0).innerText="Hello World"</code><br>
You may execute these examples by pasting them into the expression field.
</blockquote>
<h3>Result Type</h3>
<blockquote>
The type of the result of the given expression.
</blockquote>
<h3>Result(s)</h3>
<blockquote>
The result of the expression is implicitly converted to a primitive type by the javascript interpreter,
if <em>evaluate</em> was pressed. When <em>list properties</em> was pressed, a <code>for (var i in obj)</code> loop
is executed to list the properties. These object properties are in turn evaluated and their types and values
are displayed.
</blockquote>
<p>
<a href="mailto:till@snafu.de?subject=JavaScript%20Konsole">Till Krech</a>
</p>
<p>
<br>
</p>
</body>
</html>
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