在javascript中更新div之間的線

我正在嘗試製作一個網頁，在這裏人們可以點擊兩個對象，並在這兩個對象之間創建一條線。但我想繼續努力，並能夠將最後一個與另一個連接起來。這是迄今爲止的代碼。在javascript中更新div之間的線

<!doctype html> 
<html> 
<head> 
<meta charset="utf-8"> 
<title>Untitled Document</title> 
<style type="text/css"> 
    img { 
     padding: 1px; 
     margin: 2px; 
     float: left; 
     background-color: #99BC99 
    } 
    img.selected { 
     padding: 2px; 
     margin: 4px;   
     background-color: #E13300 
    } 
</style> 
<script src="http://code.jquery.com/jquery-1.9.1.js"></script> 
<script type="text/javascript"> 

$(document).ready(function() { 
    $('img').click(function(){ 
     $(this).toggleClass('selected'); 
     }); 
    }); 

function connect(div1, div2, color, thickness) { 
    var off1 = getOffset(div1); 
    var off2 = getOffset(div2); 
    // bottom right 
    var x1 = off1.left + off1.width; 
    var y1 = off1.top + off1.height; 
    // top right 
    var x2 = off2.left + off2.width; 
    var y2 = off2.top; 
    // distance 
    var length = Math.sqrt(((x2-x1) * (x2-x1)) + ((y2-y1) * (y2-y1))); 
    // center 
    var cx = ((x1 + x2)/2) - (length/2); 
    var cy = ((y1 + y2)/2) - (thickness/2); 
    // angle 
    var angle = Math.atan2((y1-y2),(x1-x2))*(180/Math.PI); 
    // make hr 
    var htmlLine = "<div style='padding:0px; margin:0px; height:" + thickness + "px; background-color:" + color + "; line-height:1px; position:absolute; left:" + cx + "px; top:" + cy + "px; width:" + length + "px; -moz-transform:rotate(" + angle + "deg); -webkit-transform:rotate(" + angle + "deg); -o-transform:rotate(" + angle + "deg); -ms-transform:rotate(" + angle + "deg); transform:rotate(" + angle + "deg);' />"; 
    // 
    document.body.innerHTML += htmlLine; 
} 

function getOffset(el) { 
    var _x = 0; 
    var _y = 0; 
    var _w = el.offsetWidth|0; 
    var _h = el.offsetHeight|0; 
    while(el && !isNaN(el.offsetLeft) && !isNaN(el.offsetTop)) { 
     _x += el.offsetLeft - el.scrollLeft; 
     _y += el.offsetTop - el.scrollTop; 
     el = el.offsetParent; 
    } 
    return { top: _y, left: _x, width: _w, height: _h }; 
} 

window.testIt = function() { 
    var div1 = document.getElementById('div1') 
    var div2 = document.getElementById('div2') 
    connect(div1, div2, "#0F0", 5); 
} 
</script> 

</head> 

<body> 
<script type="text/javascript"> 

</script> 
    <a onclick="testIt();">Draw line</a> 
    <span style="position: absolute; left: 933px; top: 211px;"> <img src="Untitled-2.jpg" alt="" width="35" height="35" id="div1"/></span> 
    <span style="position: absolute; left: 304px; top: 190px;"> <img src="Untitled-3.jpg" alt="" width="35" height="35" id="div2"/></span> 
    <span style="position: absolute; left: 756px; top: 264px;"> <img src="Untitled-4.jpg" alt="" width="35" height="35" id="div3"/></span> 
    <span style="position: absolute; left: 365px; top: 395px;"> <img src="Untitled-6.jpg" alt="" width="35" height="35" id="div4"/></span> 
    <span style="position: absolute; left: 129px; top: 302px;"> <img src="Untitled-5.jpg" alt="" width="35" height="35" id="div5"/></span> 
    <span style="position: absolute; left: 504px; top: 261px;"> <img src="Untitled-7.jpg" alt="" width="35" height="35" id="div6"/></span> 
    <span style="position: absolute; left: 650px; top: 393px;"> <img src="Untitled-8.jpg" alt="" width="35" height="35" id="div7"/></span> 
    <span style="position: absolute; left: 283px; top: 26px;"> <img src="Untitled-9.jpg" alt="" width="35" height="35" id="div8"/></span> 
    <span style="position: absolute; left: 593px; top: 35px;"> <img src="Untitled-10.jpg" alt="" width="35" height="35" id="div9"/></span> 
    <span style="position: absolute; left: 784px; top: 42px;"> <img src="Untitled-1.jpg" alt="" width="35" height="35" id="div10"/></span> 
</body> 
</html>

但它停止前2個div。我如何更新div。假設我想讓div1成爲之前的div2和div2，以便我點擊它。在此先感謝，我爲這個問題的愚蠢道歉。最好的問候。

來源

2014-01-06 user3095198

您需要緩存最後點擊的元素。

看到這個小提琴：http://jsfiddle.net/RY6dM/

基於您的代碼，並沒有做任何大的變化：

$('img').click(function(){ 
    var $elem1 = $(this).parent(); // cache the span 
    var $elem2 = $('span.last'); // cache the span with class last 
    $(this).toggleClass('selected'); 
    if ($elem2.length > 0) {  // for the first time there is no cached element 
     connect($elem1[0], $elem2[0], "#0F0", 5); 
    } else { 
     $elem1.addClass('last');  // for subsequent clicks, cache last element 
    } 
    $('span').removeClass('last'); // remove class last from all spans 
    $elem1.addClass('last');   // add class last to current element 
});

此外，而不是：

document.body.innerHTML += htmlLine;

你需要做：

$('body').append($(htmlLine));

來源

2014-01-06 11:23:35 Abhitalks

在javascript中更新div之間的線

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