JavaScript enhancement tutorial - DOM programming (two methods of controlling div movement)-JS Tutorial-php.cn

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JavaScript enhancement tutorial - DOM programming (two methods of controlling div movement)

黄舟

Jan 21, 2017 pm 04:21 PM

The first button control
First create two html buttons and a div and give the div a style

input type="button" value="左" id="1">
<input type="button" value="右" id="2">
<div id="3">
div {
            width: 100px;
            height: 100px;
            background-color: bisque;
            position: absolute;
            left: 100px;
            top: 100px;
        }

Then get the div and two buttons in the script

var left = document.getElementById("2");
    var right = document.getElementById("1");
    var div = document.getElementById("3");

Then add the onclick function

left.onclick = function () {
           
    }
    right.onclick = function () {
      
    }

Set a variable to control the left change of the div

var x = 100;

Triggered when the button is clicked

left.onclick = function () {
            x=x+10;
            div.style.left = x+"px";
    }
    right.onclick = function () {
        x=x-10;
        div.style.left = x+"px";
    }

Source code:

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
       div {             width: 100px;             height: 100px;             background-color: bisque;      
              position: absolute;             left: 100px;             top: 100px;         }
    </style>
</head>
<body>
<input type="button" value="左" id="1"> <input type="button" value="右" id="2"> <div id="3"> </div>

<script>
    var left = document.getElementById("2");     var right = document.getElementById("1");    
     var div = document.getElementById("3");
    var x = 100;
    left.onclick = function () {             x=x+10;             div.style.left = x+"px";   
      }     right.onclick = function () {         x=x-10;         div.style.left = x+"px";     }

</script>

</body>
</html>

Second type, key value control
Similarly create a div in html and give it style

<div id="3">
</div>
<style>
       div {
            width: 100px;
            height: 100px;
            background-color: bisque;
            position: absolute;
            left: 100px;
            top: 100px;
        }
    </style>

Get the div in the script

var div=document.getElementById("3");

Then declare two variables to control changing the left and top of the div

var px=100;
 var py =100;

Then get the key value
document.onkeydown (in the document document object, pressing any key will trigger this function)## The event.keyCode output in #alert will correspond to the event value corresponding to the current key when the key is pressed (that is, each key corresponds to a key value)

document.onkeydown = function(){
        alert(event.keyCode);
}

Then pass the test Get the key values left and right, change the left and top of the div in the swich statement to change its position

switch (event.keyCode){
            case 37:
            px = px-10;
            div.style.left = px+"px";
                break;
            case 38:
                py = py-10;
                div.style.top = py+"px";
                break;
            case 39:
                px = px+10;
                div.style.left = px+"px";
                break;
            case 40:
                py = py+10;
                div.style.top = py+"px";
                break;
        }

Source code:




    
    Title
    



 

<script>

    var div=document.getElementById(&quot;3&quot;);
    var px=100;
    var py =100;
    document.onkeydown = function(){
//        alert(event.keyCode);
        switch (event.keyCode){             case 37:             px = px-10;            
         div.style.left = px+"px";                 break;             case 38:                
          py = py-10;                 div.style.top = py+"px";                 break;           
            case 39:                 px = px+10;                 div.style.left = px+"px";                
             break;             case 40:                 py = py+10;                 div.style.top = py+"px";                 break;         }
    }

</script>

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