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JavaScript製作的SpinBox外掛程式

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標籤：javascript   spin-box   外掛程式   

今天用JavaScript寫了一個SpinBox外掛程式。先看一下效果吧：

用法是這樣的：

<!DOCTYPE html><html lang="zh-cn"><head>    <meta charset="UTF-8">    <meta name="viewport" content="width=device-width, initial-scale=1">    <title>Test html for the SpinBox</title></head><body>    <p>下面是一個Spin Box！</p>    <p><div class="spinbox"></div></p>    <div class="spinbox" value=‘50‘ min=‘45.9‘ max=‘51.2‘ step=‘0.1‘ fix=‘1‘ interval=‘100‘></div>    <p><br/><br/>測試一段話看看！</p>    <script src="spinbox.js"></script></body></html>

用法是：設定一個class=‘spinbox‘ 的div ，可以設定如下屬性：

屬性名稱 意義 預設值
max 變化範圍最大值 100
min 變化範圍最小值 0
step 變化步長 1
fix 顯示的小數點後的位元 0
interval 當滑鼠一直按著按鈕時，多少毫秒變化一次數字 300

spinbox.js代碼如下：

(function() {var spinboxes = document.getElementsByClassName(‘spinbox‘);for (var i = 0; i < spinboxes.length; ++i) {    var value = parseFloat(spinboxes[i].getAttribute(‘value‘));    if (isNaN(value)) {        value = 0;        spinboxes[i].setAttribute(‘value‘, ‘0‘);    }    var max = parseFloat(spinboxes[i].getAttribute(‘max‘));    if (isNaN(max))        spinboxes[i].setAttribute(‘max‘, ‘100‘);    var min = parseFloat(spinboxes[i].getAttribute(‘min‘));    if (isNaN(min))        spinboxes[i].setAttribute(‘min‘, ‘0‘);    var step = parseFloat(spinboxes[i].getAttribute(‘step‘));    if (isNaN(step))        spinboxes[i].setAttribute(‘step‘, ‘1‘);    var fix = parseInt(spinboxes[i].getAttribute(‘fix‘));    if (isNaN(fix))        spinboxes[i].setAttribute(‘fix‘, ‘0‘);    var interval = parseInt(spinboxes[i].getAttribute(‘interval‘));    if (isNaN(interval))        spinboxes[i].setAttribute(‘interval‘, ‘300‘);    var left = document.createElement(‘div‘);    left.style.width = ‘0‘;    left.style.height = ‘0‘;    left.style.borderTop = ‘12px solid transparent‘;    left.style.borderRight = ‘12px solid black‘;    left.style.borderBottom = ‘12px solid transparent‘;    left.style.float = ‘left‘;    left.style.marginRight = ‘2px‘;    spinboxes[i].appendChild(left);    var input = document.createElement(‘input‘);    input.innerHTML = ‘0‘;    input.value = value.toFixed(fix);    input.readOnly = true;    input.style.float = ‘left‘;    input.style.width = ‘40px‘;    input.style.textAlign = ‘center‘;    input.style.fontSize = ‘14px‘;    spinboxes[i].appendChild(input);    var right = document.createElement(‘div‘);    right.style.width = ‘0‘;    right.style.height = ‘0‘;    right.style.borderTop = ‘12px solid transparent‘;    right.style.borderLeft = ‘12px solid black‘;    right.style.borderBottom = ‘12px solid transparent‘;    right.style.float = ‘left‘;    right.style.marginRight = ‘20px‘;    right.style.marginLeft = ‘2px‘;    spinboxes[i].appendChild(right);    spinboxes[i].isDown = false;    left.addEventListener(‘mousedown‘, leftClick, false);    right.addEventListener(‘mousedown‘, rightClick, false);    left.addEventListener(‘mouseup‘, mouseUp, false);    right.addEventListener(‘mouseup‘, mouseUp, false);    left.addEventListener(‘mouseout‘, mouseUp, false);    right.addEventListener(‘mouseout‘, mouseUp, false);}function leftClick(event) {    var input = event.target.nextSibling;    var parent = input.parentNode;    var min = parseFloat(parent.getAttribute(‘min‘));    var value = parseFloat(parent.getAttribute(‘value‘));    var fix = parseInt(parent.getAttribute(‘fix‘));    var step = parseFloat(parent.getAttribute(‘step‘));    var interval = parseInt(parent.getAttribute(‘interval‘));    parent.isDown = true;    (function downLoop() {        if (value > min && parent.isDown) {            setTimeout(downLoop, interval);            value -= step;            input.value = value.toFixed(fix);            parent.setAttribute(‘value‘, value + ‘‘);        }    })();}function rightClick(event) {    var input = event.target.previousSibling;    var parent = input.parentNode;    var max = parseFloat(parent.getAttribute(‘max‘));    var value = parseFloat(parent.getAttribute(‘value‘));    var fix = parseInt(parent.getAttribute(‘fix‘));    var step = parseFloat(parent.getAttribute(‘step‘));    var interval = parseInt(parent.getAttribute(‘interval‘));    parent.isDown = true;    (function upLoop() {        if (value < max && parent.isDown) {            setTimeout(upLoop, interval);            value += step;            input.value = value.toFixed(fix);            parent.setAttribute(‘value‘, value + ‘‘);        }    })();}function mouseUp(event) {    event.target.parentNode.isDown = false;}}());

JavaScript製作的SpinBox外掛程式

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