嗨,我在写一个小计算器锻炼身体。目前还没有逻辑。我仍然希望允许用户在浏览器中拖动计算器。
因此,我将我的Calculator元素嵌套在此-Tag中,并实现了一些Drag-Drop-logic(主要来自于教程)。仍然不起作用。
有人看到我做错了吗?
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>myCalculator</title>
<script type="text/javascript">
var dragObject = null;
var dragX = 0;
var dragY = 0;
var posX = 0;
var posY = 0;
function handleInput(currentInput){
alert(currentInput);
var x = 0;
x = currentInput;
}
function saveOperator(currentOperator){
alert(currentOperator);
}
function dragInit(){
document.onmousemove = drag;
document.onmouseup = dragStop;
}
function dragStop(){
dragObject = null;
}
function dragStart(element){
dragObject = element;
dragX = posX - dragObject.offsetLeft;
dragY = posY - dragObject.offsetTop;
}
function drag(event){
posX = document.all ? window.event.clientX : event.pageX;
posY = document.all ? window.event.clientY : event.pageY;
if(dragObject != nul){
dragObject.style.left = (posX - dragX) + "px";
dragObject.style.top = (posY - dragY) + "px";
}
}
</script>
</head>
<body onload="dragInit">
<div id="calc" onmousedown="dragStart(this)" style="position:absolute;top:10px;left:10px;height:270px;width:200px;background:#006600">
<h1 id="headLine"><b>myCalculator</b></h1>
<input type="text" id="calcField"/>
<table style="position: absolute;" id="calculatorTable">
<tr>
<td><input id="7" type="button" value="7" onclick="handleInput(this.value)"/></td>
<td><input id="8" type="button" value="8" onclick="handleInput(this.value)"/></td>
<td><input id="9" type="button" value="9" onclick="handleInput(this.value)"/></td>
<td><input id="/" type="button" value="/" onclick="saveOperator(this.value)"/></td>
</tr>
<tr>
<td><input id="4" type="button" value="4" onclick="handleInput(this.value)"/></td>
<td><input id="5" type="button" value="5" onclick="handleInput(this.value)"/></td>
<td><input id="6" type="button" value="6" onclick="handleInput(this.value)"/></td>
<td><input id="*" type="button" value="*" onclick="saveOperator(this.value)"/></td>
</tr>
<tr>
<td><input id="1" type="button" value="4" onclick="handleInput(this.value)"/></td>
<td><input id="2" type="button" value="5" onclick="handleInput(this.value)"/></td>
<td><input id="3" type="button" value="6" onclick="handleInput(this.value)"/></td>
<td><input id="-" type="button" value="-" onclick="saveOperator(this.value)"/></td>
</tr>
<tr>
<td><input id="0" type="button" value="0" onclick="handleInput(this.value)"/></td>
<td><input id="," type="button" value="," onclick="handleInput(this.value)"/></td>
<td><input id="+" type="button" value="+" onclick="saveOperator(this.value)"/></td>
<td><input id="=" type="button" value="=" onclick="saveOperator(this.value)"/></td>
</tr>
</table>
</div>
</body>
</html>
最佳答案
您在第56行出现语法错误。使用null
代替nul
。您可能想要使用JS语法检查器,例如JSLint。
然后,在第66行,您可能想调用dragInit
函数,因此您应该在括号中写上<body onload="dragInit()">
(而不是花括号,这要感谢“轨道中的Lightness Races”;)