我有一个 Greasemonkey 脚本,其逻辑如下:
除非登录用户属于特权组(JOHN、LUKE、JEFF、MAX、ANDY),否则禁用
<input>
withname="prio"
。如果不是特权用户,请阻止从
<input name="dest">
.
具体来说,阻止“12”或“22”并写入错误消息。
该脚本工作正常,但有一个错误:
当我在其他输入字段中插入文本或更改选择字段并按Enter时,提交停止并且我在控制台中收到错误消息:
错误:destInput[0] 没有属性源文件:file:///E:/FirefoxPortable2.x/Data/profile/extensions/%7Be4a8a97b-f2ed-450b-b12d-ee082ba24781%7D/components/greasemonkey.js 行: 379
var err = this.findError(script, line - lineFinder.lineNumber - 1);
我认为该规则name="dest"
适用于所有输入字段和选择字段?但我只想要“dest”输入的规则。
这是我的脚本代码:
// ==UserScript==
// @name _SO Block submit on custom FF2 page.
// @namespace PC
// @include file:///D:/temp/foo%20SO/task*
// @include file:///D:/temp/foo%20SO/fixture*
// @include file:///D:/temp/foo%20SO/pallet*
// ==/UserScript==
GM_log ("Script start.");
unsafeWindow._oldSubmit = unsafeWindow.document.forms[0].submit;
unsafeWindow.document.forms[0].submit = function () {
GM_log ("Submit function fired.");
var destInput = document.getElementsByName ("dest");
if ( ! destInput || destInput.length == 0) {
//unsafeWindow._oldSubmit ();
}
var destValue = destInput[0].value;
if ( /^\s*$/.test (destValue)
|| excludedDestinations.indexOf (destValue) > -1
) {
GM_log ("Submit should be blocked! (1)");
}
else {
//unsafeWindow._oldSubmit ();
}
};
//--- Make sure this list of names is all uppercase.
var usersWhoCanSetPriority = ['JOHN', 'LUKE', 'JEFF', 'MAX', 'ANDY'];
var excludedDestinations = ['12', '22'];
var bDisablePrio = true;
var tdNodes = document.getElementsByTagName ("TD");
for (var J = tdNodes.length - 1; J >= 0; --J) {
var tdNode = tdNodes[J];
if (tdNode.className == "user") {
var userName = tdNode.textContent.replace (
/^(?:.|\n|\r)+\(User:\s+([^)]+)\)(?:.|\n|\r)+$/i, "$1"
).toUpperCase ();
if (usersWhoCanSetPriority.indexOf (userName) > -1) {
bDisablePrio = false;
}
}
}
if (bDisablePrio) {
var oldInput = document.getElementsByName ("prio");
if (oldInput && oldInput.length) {
oldInput[0].setAttribute ("disabled", "disabled");
}
var destInput = document.getElementsByName ("dest");
if (destInput && destInput.length) {
destInput[0].addEventListener (
"change",
function (zEvent) {
bCheckdestinationValue (destInput[0]);
GM_log ("Change handler fired.");
},
false
);
destInput[0].form.addEventListener (
"submit",
function (zEvent) {
GM_log ("Submit handler fired.");
var destValue = destInput[0].value;
if ( /^\s*$/.test (destValue)
|| excludedDestinations.indexOf (destValue) > -1
) {
//--- Stop the submit
zEvent.preventDefault ();
//zEvent.stopPropagation ();
GM_log ("Submit should be blocked! (2)");
return false;
}
},
true
);
}
}
function bCheckdestinationValue (destInputNd) {
//--- Returns true if value is bad.
if (excludedDestinations.indexOf (destInputNd.value) > -1) {
destInputNd.value = ''; // Blank input
//--- Add or show Error message.
var destErrNode = document.getElementById ("gmDestErrorDisp");
if (destErrNode) {
destErrNode.style.display = "inline";
}
else {
destErrNode = document.createElement ('b');
destErrNode.id = "gmDestErrorDisp";
destErrNode.style.color = "red";
destErrNode.textContent = "12 and 22 are forbidden";
destInputNd.parentNode.appendChild (destErrNode);
}
return true;
}
else {
var destErrNode = document.getElementById ("gmDestErrorDisp");
if (destErrNode) {
destErrNode.style.display = "none";
}
}
return false;
}
PS:pastebin 代码(unsafeWindow..)是我旧系统上唯一的工作版本。系统运行 FF 2.0.0.11 和 Greasemonkey 0.8 并且无法更新。
有没有办法消除这个错误?:D