[英]Making a table using Javascript
我的表格未与Javascript一起显示时出现此问题。 假定工作到用户在window.prompt
输入10个数字的位置。提示时,数字将被放入数组并显示在表格中。
这是代码:
<html>
<head>
<meta charset = "utf-8">
<script type = "text/javascript">
var number = -99;
var array1 = new Array(10);
number = window.prompt("Enter 1 to continue \n Enter -99 to exit");
if(number == -99 || number == ""){
exit();
}else
array1 = window.prompt("Please enter 10 numbers to be stored into an array");
function outputArray(heading, theArray, output){
var content = "<h2>" + heading + "</h2><table><thead><th>Index</th><th>Value</th></thead><tbody>";
var length = theArray.length;
for(var i=0; i<length;++i){
content += "<tr><td>" + i + "</td><td>" + theArray[i] + "</td></tr>";
}
content += "</tbody></table>";
output.innerHTML = content;
}
outputArray("Your Array is:", array1, document.getElementById("output"));
</script>
</head>
<body>
<div id="output"></div>
</body>
</html>
您应该将脚本包装在onload处理程序中:
var onLoadHandler = function() {
var number = -99;
var array1 = new Array(10);
number = window.prompt("Enter 1 to continue \n Enter -99 to exit");
if(number == -99 || number == ""){
exit();
}else
array1 = window.prompt("Please enter 10 numbers to be stored into an array");
function outputArray(heading, theArray, output){
var content = "<h2>" + heading + "</h2><table><thead><th>Index</th><th>Value</th></thead><tbody>";
var length = theArray.length;
for(var i=0; i<length;++i){
content += "<tr><td>" + i + "</td><td>" + theArray[i] + "</td></tr>";
}
content += "</tbody></table>";
output.innerHTML = content;
}
outputArray("Your Array is:", array1, document.getElementById("output"));
}
if (window.addEventListener) {
window.addEventListener('load', onLoadHandler, false);
} else if (window.attachEvent) {
window.attachEvent('onload', onLoadHandler );
}
也就是说,您正在尝试操作DOM元素,而该元素可能仍然不存在。
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