jquery implements simple mask layer_javascript skills

This article explains the jquery mask layer with examples, including different styles of mask layer implementation, mask implementation of mask layer, etc. It is shared with everyone for your reference. The specific content is as follows

1. jQuery implements different styles of mask layers
1.1 Background translucent mask layer style
A black (or other) background is required and must be set to absolute positioning. The following is the css style used in the project:

/* 半透明的遮罩层 */
#overlay {
  background: #000;
  filter: alpha(opacity=50); /* IE的透明度 */
  opacity: 0.5; /* 透明度 */
  display: none;
  position: absolute;
  top: 0px;
  left: 0px;
  width: 100%;
  height: 100%;
  z-index: 100; /* 此处的图层要大于页面 */
  display:none;
}

1.2 jQuery to implement mask

/* 显示遮罩层 */
function showOverlay() {
  $("#overlay").height(pageHeight());
  $("#overlay").width(pageWidth());

  // fadeTo第一个参数为速度，第二个为透明度
  // 多重方式控制透明度，保证兼容性，但也带来修改麻烦的问题
  $("#overlay").fadeTo(200, 0.5);
}

/* 隐藏覆盖层 */
function hideOverlay() {
  $("#overlay").fadeOut(200);
}

/* 当前页面高度 */
function pageHeight() {
  return document.body.scrollHeight;
}

/* 当前页面宽度 */
function pageWidth() {
  return document.body.scrollWidth;
}

1.3 Prompt Box
The purpose of the mask is to make it impossible to operate the content and highlight the prompt box. The prompt box can be made by referring to the above. The z-index can be higher than the mask layer. The main question is how to control the prompt box to be centered in the browser.

/* 定位到页面中心 */
function adjust(id) {
  var w = $(id).width();
  var h = $(id).height();
  
  var t = scrollY() + (windowHeight()/2) - (h/2);
  if(t < 0) t = 0;
  
  var l = scrollX() + (windowWidth()/2) - (w/2);
  if(l < 0) l = 0;
  
  $(id).css({left: l+'px', top: t+'px'});
}

//浏览器视口的高度
function windowHeight() {
  var de = document.documentElement;

  return self.innerHeight || (de && de.clientHeight) || document.body.clientHeight;
}

//浏览器视口的宽度
function windowWidth() {
  var de = document.documentElement;

  return self.innerWidth || (de && de.clientWidth) || document.body.clientWidth
}

/* 浏览器垂直滚动位置 */
function scrollY() {
  var de = document.documentElement;

  return self.pageYOffset || (de && de.scrollTop) || document.body.scrollTop;
}

/* 浏览器水平滚动位置 */
function scrollX() {
  var de = document.documentElement;

  return self.pageXOffset || (de && de.scrollLeft) || document.body.scrollLeft;
}

2. Jquery super simple mask layer implementation code
In development, in order to avoid secondary submission, the use of mask layers is becoming more and more common
After reading a lot of code, let me share with you what I think is the simplest way to implement the mask layer:
1. The style is set as follows:
CSS code:

<style type="text/css">   
  .mask {    
      position: absolute; top: 0px; filter: alpha(opacity=60); background-color: #777;   
      z-index: 1002; left: 0px;   
      opacity:0.5; -moz-opacity:0.5;   
    }   
</style>  

Among them: opacity:0.5; is suitable for IE, -moz-opacit:0.5; is suitable for Firefox; you only need to add them, and it can be used in both Firefox and IE.
2. Specify the height and width of the layer
js code

<pre class="html" name="code"><script type="text/javascript">   
  //兼容火狐、IE8  
  //显示遮罩层  
  function showMask(){   
    $("#mask").css("height",$(document).height());   
    $("#mask").css("width",$(document).width());   
    $("#mask").show();   
  } 
  //隐藏遮罩层 
  function hideMask(){   
     
    $("#mask").hide();   
  } 
   
</script> 

3. Add the following code to , and then you can see the effect

html code

<div id="mask" class="mask"></div>  
<a href="javascript:;" onclick="showMask()" >点我显示遮罩层</a><br /> 

4. How to use
After ajax submits the form, add the showMask method, and after the data is returned, add hideMask()
Those who need it can add some prompt information on the mask layer according to their own needs

3. Release a JQuery mask layer implementation (mask)

Those who have used ExtJs may know that a lot of UI elements are integrated in ExtJs, which is very convenient for us to use. There are two methods, mask() and unmask(), which add a mask layer and a prompt message to the specified element to increase customer experience. When I was working on a project recently, I found that sometimes in order to use these two methods, I needed to introduce a relatively "large" Extjs, which I felt was a bit uneconomical, so I used jquery to implement a relatively simple mask and unmask method to achieve this effect. Everyone knows that jquery is an excellent javascript framework. It is not only small in size but also easy to use. Now I am gradually replacing all the codes or components implemented using Extjs in the system with Jquery. Okay, without further ado, let me introduce my code. These codes are modified based on the documentMask implemented by a friend on the Internet, making it more flexible and convenient to use.

(function(){
    $.extend($.fn,{
      mask: function(msg,maskDivClass){
        this.unmask();
        // 参数
        var op = {
          opacity: 0.8,
          z: 10000,
          bgcolor: '#ccc'
        };
        var original=$(document.body);
        var position={top:0,left:0};
              if(this[0] && this[0]!==window.document){
                original=this;
                position=original.position();
              }
        // 创建一个 Mask 层，追加到对象中
        var maskDiv=$('<div class="maskdivgen"> </div>');
        maskDiv.appendTo(original);
        var maskWidth=original.outerWidth();
        if(!maskWidth){
          maskWidth=original.width();
        }
        var maskHeight=original.outerHeight();
        if(!maskHeight){
          maskHeight=original.height();
        }
        maskDiv.css({
          position: 'absolute',
          top: position.top,
          left: position.left,
          'z-index': op.z,
         width: maskWidth,
          height:maskHeight,
          'background-color': op.bgcolor,
          opacity: 0
        });
        if(maskDivClass){
          maskDiv.addClass(maskDivClass);
        }
        if(msg){
          var msgDiv=$('<div style="position:absolute;border:#6593cf 1px solid; padding:2px;background:#ccca"><div style="line-height:24px;border:#a3bad9 1px solid;background:white;padding:2px 10px 2px 10px">'+msg+'</div></div>');
          msgDiv.appendTo(maskDiv);
          var widthspace=(maskDiv.width()-msgDiv.width());
          var heightspace=(maskDiv.height()-msgDiv.height());
          msgDiv.css({
                cursor:'wait',
                top:(heightspace/2-2),
                left:(widthspace/2-2)
           });
         }
         maskDiv.fadeIn('fast', function(){
          // 淡入淡出效果
          $(this).fadeTo('slow', op.opacity);
        })
        return maskDiv;
      },
     unmask: function(){
           var original=$(document.body);
             if(this[0] && this[0]!==window.document){
              original=$(this[0]);
           }
           original.find("> div.maskdivgen").fadeOut('slow',0,function(){
             $(this).remove();
           });
      }
    });
  })();

The following is the usage example code for reference

<html>
  <head>
    <style>
      body{
        font-size:12px;
      }  
    </style>
    <script src="jquery-1.3.2.js" type="text/javascript"></script>
    <script type="text/javascript">
      (function(){
    $.extend($.fn,{
      mask: function(msg,maskDivClass){
        this.unmask();
        // 参数
        var op = {
          opacity: 0.8,
          z: 10000,
          bgcolor: '#ccc'
        };
        var original=$(document.body);
        var position={top:0,left:0};
              if(this[0] && this[0]!==window.document){
                original=this;
                position=original.position();
              }
        // 创建一个 Mask 层，追加到对象中
        var maskDiv=$('<div class="maskdivgen"> </div>');
        maskDiv.appendTo(original);
        var maskWidth=original.outerWidth();
        if(!maskWidth){
          maskWidth=original.width();
        }
        var maskHeight=original.outerHeight();
        if(!maskHeight){
          maskHeight=original.height();
        }
        maskDiv.css({
          position: 'absolute',
          top: position.top,
          left: position.left,
          'z-index': op.z,
         width: maskWidth,
          height:maskHeight,
          'background-color': op.bgcolor,
          opacity: 0
        });
        if(maskDivClass){
          maskDiv.addClass(maskDivClass);
        }
        if(msg){
          var msgDiv=$('<div style="position:absolute;border:#6593cf 1px solid; padding:2px;background:#ccca"><div style="line-height:24px;border:#a3bad9 1px solid;background:white;padding:2px 10px 2px 10px">'+msg+'</div></div>');
          msgDiv.appendTo(maskDiv);
          var widthspace=(maskDiv.width()-msgDiv.width());
          var heightspace=(maskDiv.height()-msgDiv.height());
          msgDiv.css({
                cursor:'wait',
                top:(heightspace/2-2),
                left:(widthspace/2-2)
           });
         }
         maskDiv.fadeIn('fast', function(){
          // 淡入淡出效果
          $(this).fadeTo('slow', op.opacity);
        })
        return maskDiv;
      },
     unmask: function(){
           var original=$(document.body);
             if(this[0] && this[0]!==window.document){
              original=$(this[0]);
           }
           original.find("> div.maskdivgen").fadeOut('slow',0,function(){
             $(this).remove();
           });
      }
    });
  })();
    </script>
  </head>
  <body style="width:100%">
    
    测试
  <div id="test" style="width:200px;height:100px; border:black 1px solid;">
  </div>
  <a href="#" onclick="$('#test').mask('DIV层遮罩')">div遮罩</a>
  <a href="#" onclick="$('#test').unmask()">关闭div遮罩</a>
  <a href="#" onclick="$(document).mask('全屏遮罩').click(function(){$(document).unmask()})">全部遮罩</a>
  </body>
</html>

The above is the complete introduction to the implementation of the mask layer in jquery. I hope it will be helpful to everyone's learning.