[英]Why won't my JavaScript load on my webpage (using window.onload)?
我正在尝试使用实时预览 function(我在本地服务器上查看网页)在 Adobe Dreamweaver 中开发 HTML 页面,而我的 JavaScript 正在修复。 我试图用 JS 数组填充下拉菜单,并且我之前的测试有效,但是现在当我尝试让脚本自动运行时,a)没有任何反应或 b)按钮闪烁,表明它已更新但仍显示为空白。 任何帮助,将不胜感激!
<script>
function start() {
var arrOptions = []; //arrOptionsCollection with HTML tags
var arrOptionsCollection = [0, 1, 2]; //Values for dropdown
arrOptions.push("<option value='Select From List...'>Select From List...</option>") //Dropdown Default
//Adds HTML tags to arrOptionsCollections
for (var i=0, n = arrOptionsCollection.length; i < n; i++) { =
arrOptions.push("<option value='" + arrOptionsCollection[i] + "'>" + arrOptionsCollection[i] + "</option>");
}
//Transfers arrOptions to actual HTML
document.getElementById("district-select").innerHTML = arrOptions.join();
}
document.getElementById("form-select").onload = function() {start()};
</script>
<body onload="start();">
<form id="form-select">
<select id="district-select">
<!--Script Inserts Options Here-->
</select>
</form>
我想知道=
在你的for
循环开头的作用是什么。 简单地说,它没有任何意义。
所以而不是:
for (var i=0, n = arrOptionsCollection.length; i < n; i++) { =
放:
for (var i=0, n = arrOptionsCollection.length; i < n; i++) {
这是您的代码:
function start() { var arrOptions = []; //arrOptionsCollection with HTML tags var arrOptionsCollection = [0, 1, 2]; //Values for dropdown arrOptions.push("<option value='Select From List...'>Select From List...</option>") //Dropdown Default //Adds HTML tags to arrOptionsCollections for (var i=0, n = arrOptionsCollection.length; i < n; i++) { arrOptions.push("<option value='" + arrOptionsCollection[i] + "'>" + arrOptionsCollection[i] + "</option>"); } //Transfers arrOptions to actual HTML document.getElementById("district-select").innerHTML = arrOptions.join(); } document.getElementById("form-select").onload = function() {start()};
<body onload="start();"> <form id="form-select"> <select id="district-select"> <!--Script Inserts Options Here--> </select> </form>
这是一个现场演示: https://codepen.io/marchmello/pen/yLYbYjw?editors=1010
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