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[英]easiest way to read data from excel spreadsheet with javascript?
[英]javascript: easiest way to output names from student ID
我的JS代码
<script language="Javascript">
var data = {
7: "Jack Black",
8: "John Smith"
};
var id = document.getElementById("id"),
emp = document.getElementById("name");
id.addEventListener("keyup", function() {
emp.value = data[this.value] || "No name with this ID Number";
});
</script>
在 HTML 中我有
<input type="number" id="id" />
<input type="text" disabled="disabled" id="name" />
那么我做错了什么,为什么当我输入 7 时,Jack Black 没有出现在文本框中?
非常感谢
问题一定出在 html 文件中 script 标签的位置,在使用 javascript 使用document.getElementById("id")
获取 ID 之前,您需要定义 id 为id
的 html 元素,这似乎是唯一的代码的问题。
脚本内容在先,html 在后,导致错误
<script language="Javascript"> var data = { 7: "Jack Black", 8: "John Smith" }; var id = document.getElementById("id"), emp = document.getElementById("name"); id.addEventListener("keyup", function() { emp.value = data[this.value] || "No name with this ID Number"; }); </script> <input type="number" id="id" /> <input type="text" disabled="disabled" id="name" />
如果我们颠倒顺序,先定义html,再定义脚本,就没有错误了!
<input type="number" id="id" /> <input type="text" disabled="disabled" id="name" /> <script language="Javascript"> var data = { 7: "Jack Black", 8: "John Smith" }; var id = document.getElementById("id"), emp = document.getElementById("name"); id.addEventListener("keyup", function() { emp.value = data[this.value] || "No name with this ID Number"; }); </script>
您的代码有效! 但是如果您想使用数字输入的箭头,请使用更改事件。
// maybe it would be better to make an array var data = { 7: "Jack Black", 8: "John Smith" }; var id = document.getElementById("id"), emp = document.getElementById("name"); function changeValue() { emp.value = data[this.value] || "No name with this ID Number"; } // event listener if (id.addEventListener) { // new browsers id.addEventListener("keyup", changeValue, false); id.addEventListener("change", changeValue, false); } else if (id.attachEvent) { // IE <9, Opera <6 id.attachEvent("onkeyup", fchangeValue); id.attachEvent("onchange", fchangeValue); } else { // old browsers id.onkeyup = changeValue; id.onchange = changeValue; }
<input type="number" id="id" /> <input type="text" disabled="disabled" id="name" />
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