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Simple implementation of JS Loading Functions

Source: Internet
Author: User
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We often see the LOADING prompt when LOADING data when browsing the Web page. In fact, the principle of this function is very simple, that is, a DIV is used to cover the current page, and then Loading is displayed on the covering DIV layer. Now let's implement it.

1. Current page:
Copy codeThe Code is as follows:
<Div class = "current"> <a href = "#" onclick = "showLoading ()"> Loading </a> </div>

2. Mask Layer:
Copy codeThe Code is as follows:
<Div id = "over" class = "over"> </div>

3. Loading presentation layer:
Copy codeThe Code is as follows:
<Div id = "layout" class = "layout"> </div>

Overall code:
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Title> </title>
<Style type = "text/css">
. Current {
Font-size: 20px;
}

. Over {
Display: none;
Position: absolute;
Top: 0;
Left: 0;
Width: 100%;
Height: 100%;
Background-color: # f5f5f5;
Opacity: 0.5;
Z-index: 1000;
}

. Layout {
Display: none;
Position: absolute;
Top: 40%;
Left: 40%;
Width: 20%;
Height: 20%;
Z-index: 1001;
Text-align: center;
}
</Style>
<Script type = "text/javascript">
Function showLoading ()
{
Document. getElementById ("over"). style. display = "block ";
Document. getElementById ("layout"). style. display = "block ";
}
</Script>
</Head>
<Body>
<Div class = "current"> <a href = "#" onclick = "showLoading ()"> Loading </a> </div>
<Div id = "over" class = "over"> </div>
<Div id = "layout" class = "layout"> </div>
</Body>
</Html>

Final effect:

I also saw another implementation method on the Internet. I felt that the idea was good. I used JS to constantly change the value of the html tag to load the prompt, based on his ideas, I implemented the following code:
Copy codeThe Code is as follows:
<! DOCTYPE html>
<Html xmlns = "http://www.w3.org/1999/xhtml">
<Head>
<Title> </title>
<! -- <Script src = "Scripts/jquery-1.8.2.js"> </script> -->
<Style type = "text/css">
# Tb {
Width: 100%;
Height: 100%;
Line-height: 10px;
}

# Tb tr td {
Text-align: center;
}

. Progressbar {
Font-family: Arial;
Font-weight: bolder;
Color: gray;
Background-color: white;
Padding: 0px;
Border-style: none;
}

. Percent {
Font-family: Arial;
Color: gray;
Text-align: center;
Border-width: medium;
Border-style: none;
}
</Style>
<Script type = "text/javascript">
Var bar = 0;
Var step = "| ";
/*
* The first method is $ (document). ready (function (){.....});
*/
// $ (Function (){
// Progress ();
//});

/*
* Method 2
*/
// Window. onload = function (){
// Progress ();
//}

/*
* Method 3: Simulate $ (document). ready (function (){.....});
*/
(Function (){
Var ie = !! (Window. attachEvent &&! Window. opera );
Var wk =/webkit \/(\ d +)/I. test (navigator. userAgent) & (RegExp. $1 <525 );
Var fn = [];
Var run = function () {for (var I = 0; I <fn. length; I ++) fn [I] () ;};
Var d = document;
D. ready = function (f ){
If (! Ie &&! Wk & d. addEventListener)
Return d. addEventListener ('domainloaded', f, false );
If (fn. push (f)> 1) return;
If (ie)
(Function (){
Try {d.doc umentElement. doScroll ('left'); run ();}
Catch (err) {setTimeout (arguments. callee, 0 );}
})();
Else if (wk)
Var t = setInterval (function (){
If (/^ (loaded | complete) $/. test (d. readyState ))
ClearInterval (t), run ();
}, 0 );
};
})();

Document. ready (function (){

Progress ();

});


Function progress (){
Bar = bar + 2;
Step = step + "| ";
Document. getElementById ("percent"). value = bar + "% ";
Document. getElementById ("progressbar"). value = step;
If (bar <= 98 ){
SetTimeout ("progress ()", 100 );
}
}
</Script>
</Head>
<Body>
<Table id = "tb">
<Tr>
<Td>
<Input type = "text" size = "50" class = "percent" id = "percent"/> </td>
</Tr>
<Tr>
<Td>
<Input type = "text" size = "50" class = "progressbar" id = "progressbar"/> </td>
</Tr>
</Table>
</Body>
</Html>

Final effect:

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