📄 the image onload event handler.aspx
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<%@ Page Language="C#" AutoEventWireup="true" CodeFile="The Image onload Event Handler.aspx.cs" Inherits="The_Image_onload_Event_Handler" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>The Image onload Event Handler</title>
<script type="text/javascript">
<!--
function loadIt(theImage,form) {
if (document.images) {
form.result.value = "";
document.images[0].lowsrc = "章节代码/第18章/DESK.GIF";
document.images[0].src = theImage;
}
}
function checkLoad(form) {
if (document.images) {
form.result.value = document.images[0].complete;
}
}
function signal() {
if(confirm("You have stopped the image from loading. Do you want to try again?")) {
location.reload();
}
}
//-->
</script>
</head>
<body>
<img alt="image" src="章节代码/第18章/CPU2.GIF" width="120" height="90"
onload="if (document.forms[0].result) document.forms[0].result.value='done'" />
<form id="form1" runat="server">
<input type="button" value="Load keyboard" onclick="loadIt('章节代码/第18章/CPU2.GIF',this.form)" />
<input type="button" value="Load arch" onclick="loadIt('章节代码/第18章/ARCH.GIF',this.form)" />
<p><input type="button" value="Is it loaded yet?" onclick="checkLoad(this.form)" />
<input type="text" name="result" /> <input type="hidden" /></p>
</form>
</body>
</html>
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