JavaScript implementation of a simple countdown popover DEMO attached

Recently I made a simple setup page, because I need to restart the device function, so I want to add a countdown popup interface on it.

The initial idea was to customize an alert popover, but it quickly became clear that the alert would sit there waiting for a confirmation click, rather than the auto-sequential display I wanted.

Later, just think of directly show and hide DIV made into a popover, you can achieve. Based on this idea, the following:

First look at the renderings:
< img SRC = "border = 0 / / files.jb51.net/file_images/article/201403/201403051647112.gif? 201425164738 ">  
< img SRC = "border = 0 / / files.jb51.net/file_images/article/201403/201403051648023.gif? 201425164814 ">  
Look at the source code:

 
<!------------------  Restart the operating   Prepare the pop-up  ---------------> 
<div id="reboot_pre" style="width: 450px; height: 200px; margin-left:auto; margin-right:auto; margin-top:200px; visibility:hidden; background: #F0F0F0; border:1px solid #00DB00; z-index:9999"> 
<div style="width: 450px; height: 30px; background:#00DB00; line-height:30px;text-align: center;"><b> In the preparation </b></div> 
<br /><br /> 
<div><p style="margin-left:50px"> Efforts are under way to prepare the restart operation for you ...  Still need to wait for a while  <span id="reboot_pre_time">4</span>  seconds </p></div> 
<br /> 
<div><button type="button" style="width:70px; height:30px; margin-left:340px" onclick="reboot_cancel()"> cancel </button></div> 
</div> 
<!------------------  Restart the operating   Prepare the pop-up  ---------------> 

<!------------------  Restart the operating   For Windows  ---------------> 
<div id="reboot_ing" style="width: 450px; height: 150px; margin-left:auto; margin-right:auto; margin-top:-150px; visibility: hidden; background: #F0F0F0; border:1px solid #00DB00"> 
<div style="width: 450px; height: 30px; background:#00DB00; line-height:30px;text-align: center;"><b> ongoing </b></div> 
<br /> 
<div><p style="margin-left:40px"> The restart operation is in progress ...  Still need to wait for a while  <span id="reboot_ing_time">14</span>  seconds </p></div> 
<br /> 
<div id="progress_reboot" style="margin-left:40px;color:#00DB00;font-family:Arial;font-weight:bold;height:18px">|</div> 
<br /> 
</div> 
<!------------------  Restart the operating   For Windows  ---------------> 


lt;script type="text/javascript"> 

var cancel_flag = 0; 
var already = 0; 

 
window.onload = reboot(); 

 
function reboot(){ 
if(confirm(" This action will disconnect all current connections and restart your device. Are you sure you want to continue? ")){ 
document.getElementById("reboot_pre_time").innerHTML = 4; 
document.getElementById("reboot_ing_time").innerHTML = 14; 
document.all.progress_reboot.innerHTML = "|"; 
download_flag = 0; 
cancel_flag = 0; 
already = 0; 
setTimeout("showDiv('reboot_pre')",500); 
delayPre_reboot("reboot_pre_time"); 
} 
} 
 
function delayPre_reboot(str) { 
if(!cancel_flag){ 
var delay = document.getElementById(str).innerHTML; 
if(delay > 0) { 
delay--; 
document.getElementById(str).innerHTML = delay; 
setTimeout("delayPre_reboot('reboot_pre_time')", 1000); 
} else { 
hideDiv("reboot_pre"); 
setTimeout("showDiv('reboot_ing')",500); 
delayDo_reboot("reboot_ing_time"); 
} 
} 
} 
 
function delayDo_reboot(str){ 
display_reboot(100); 
var delay = document.getElementById(str).innerHTML; 
if(delay > 0) { 
delay--; 
document.getElementById(str).innerHTML = delay; 
setTimeout("delayDo_reboot('reboot_ing_time')", 1000); 
} else { 
hideDiv("reboot_ing"); 
alert(" Restart successfully! "); 
} 
} 
 
function reboot_cancel(){ 
cancel_flag = 1; 
hideDiv("reboot_pre"); 
alert(" You have successfully canceled the restart operation! "); 
} 
 
function showDiv (str){ 
document.getElementById(str).style.visibility = "visible"; 
} 
 
function hideDiv (str){ 
document.getElementById(str).style.visibility = "hidden"; 
} 

 
function display_reboot(max){ 
already++; 
var dispObj = document.all.progress_reboot; 
dispObj.style.width = 100.0*already/max+"px"; 
document.all.progress_reboot.innerHTML += "|||||"; 
var timer = window.setTimeout("display("+max+")",1000); 
if (already >= max){ 
window.clearTimeout(timer); 
} 
} 

</script>