gecko/toolkit/content/tests/chrome/test_textbox_emptytext.xul

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<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>
<!--
XUL Widget Test for textbox with placeholder
-->
<window title="Textbox with placeholder test" width="500" height="600"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
<script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
<hbox>
<textbox id="t1"/>
</hbox>
<!-- test results are displayed in the html:body -->
<body xmlns="http://www.w3.org/1999/xhtml" style="height: 300px; overflow: auto;"/>
<!-- test code goes here -->
<script type="application/javascript"><![CDATA[
SimpleTest.waitForExplicitFinish();
function doTests() {
var t1 = $("t1");
t1.placeholder = 1;
ok("1" === t1.label, "placeholder exposed as label");
ok("" === t1.value, "placeholder not exposed as value");
t1.label = 2;
ok("2" === t1.label, "label can be set explicitly");
ok("1" === t1.placeholder, "placeholder persists after setting label");
t1.value = 3;
ok("3" === t1.value, "value setter/getter works while placeholder is present");
ok("1" === t1.placeholder, "placeholder persists after setting value");
t1.value = "";
is(t1.textLength, 0, "textLength while placeholder is displayed");
SimpleTest.finish();
}
SimpleTest.waitForFocus(doTests);
]]></script>
</window>