我有一个功能＆＃34; snapSelectionToWord＆＃34;应该在谷歌浏览器扩展程序中的onMouseUp事件上调用：
// Initialize ability to select and grab text from browser
function lwsSetUpTextGetter(callback) {
console.log("lwsSetUpTextGetter()");
//Set the onmouseup function to lwsGetText
document.onmouseup = snapSelectionToWord(lwsGetText);
//Handling clicking outside webpage?
if (!document.all) document.captureEvents(Event.MOUSEUP);
}
但是立即调用函数snapSelectionToWord而不是等待鼠标单击。我在这做错了什么。这是完整的代码......
内容脚本（js）
(function () {
// Holds text being selected in browser
var lwsSelectedText = '';
// Adds pop-up to current webpage
function lwsAddContent(callback) {
console.log("lwsAddContent()");
// Get body tag
var body = document.getElementsByTagName('body');
// add invisible div
document.body.innerHTML += '<div id="myModal" class="modal"><div class="modal-content"><span class="close">×</span><div id="lwsSpanishDiv"><p id="lwsSpanishTitle">Spanish</p><textarea id="lwsSpanishTextArea">Hello</textarea></div><div id="lwsEnglishDiv"><p id="lwsEnglishTitle">English</p><textarea id="lwsEnglishTextArea">Hello 2</textarea></div></div></div>';
callback(lwsSetUpTextGetter);
}
// Make the pop-up visible and set up close button
function lwsActivateContent(callback) {
console.log("lwsActivateContent()");
var modal = document.getElementById('myModal');
// Get the textarea
var txtarea = document.getElementById("myTxtArea");
// Get the <span> element that closes the modal
var span = document.getElementsByClassName("close")[0];
span.onclick = function () {
modal.style.display = "none";
}
callback(quickTranslate);
}
// Initialize ability to select and grab text from browser
function lwsSetUpTextGetter(callback) {
console.log("lwsSetUpTextGetter()");
//Set the onmouseup function to lwsGetText
document.onmouseup = snapSelectionToWord(lwsGetText);
//Handling clicking outside webpage?
if (!document.all) document.captureEvents(Event.MOUSEUP);
}
// Snaps selected text to encompass the full word
function snapSelectionToWord(callback) {
console.log("snapSelectionToWord()");
var sel;
// Check for existence of window.getSelection() and that it has a
// modify() method. IE 9 has both selection APIs but no modify() method.
if (window.getSelection && (sel = window.getSelection()).modify) {
sel = window.getSelection();
if (!sel.isCollapsed) {
// Detect if selection is backwards
var range = document.createRange();
range.setStart(sel.anchorNode, sel.anchorOffset);
range.setEnd(sel.focusNode, sel.focusOffset);
var backwards = range.collapsed;
range.detach();
// modify() works on the focus of the selection
var endNode = sel.focusNode, endOffset = sel.focusOffset;
sel.collapse(sel.anchorNode, sel.anchorOffset);
if (backwards) {
sel.modify("move", "backward", "character");
sel.modify("move", "forward", "word");
sel.extend(endNode, endOffset);
sel.modify("extend", "forward", "character");
sel.modify("extend", "backward", "word");
} else {
sel.modify("move", "forward", "character");
sel.modify("move", "backward", "word");
sel.extend(endNode, endOffset);
sel.modify("extend", "backward", "character");
sel.modify("extend", "forward", "word");
}
}
} else if ((sel = document.selection) && sel.type != "Control") {
var textRange = sel.createRange();
if (textRange.text) {
textRange.expand("word");
// Move the end back to not include the word's trailing space(s),
// if necessary
while (/\s$/.test(textRange.text)) {
textRange.moveEnd("character", -1);
}
textRange.select();
}
}
console.log("before callback...");
callback(quickTranslate);
}
//Gets selected text
function lwsGetText(callback) {
return function (e) {
console.log("lwsGetText()");
// Get access to spanish text area
var spanishText = document.getElementById('lwsSpanishTextArea');
//Get text
lwsSelectedText = (document.all) ? document.selection.createRange().text : document.getSelection();
//if nothing is selected, do nothing
if (lwsSelectedText != '') {
// test: does browser grab text correctly?
alert(lwsSelectedText);
// Set spanish text area content to the selected text from browser
spanishText.value = lwsSelectedText;
// --Error Here--
callback();
}
};
}
function quickTranslate() {
console.log("quickTranslate()");
var url = "https://translate.yandex.net/api/v1.5/tr.json/translate",
keyAPI = "trnsl.1.1.20130922T110455Z.4a9208e68c61a760.f819c1db302ba637c2bea1befa4db9f784e9fbb8";
var englishTextArea = document.getElementById('lwsEnglishTextArea');
var spanishTextArea = document.getElementById('lwsSpanishTextArea');
englishTextArea.value = 'Working...';
var xhr = new XMLHttpRequest(),
textAPI = spanishTextArea.value,
langAPI = 'es-en';
data = "key=" + keyAPI + "&text=" + textAPI + "&lang=" + langAPI;
xhr.open("POST", url, true);
xhr.setRequestHeader("Content-type", "application/x-www-form-urlencoded");
xhr.send(data);
xhr.onreadystatechange = function () {
if (this.readyState == 4 && this.status == 200) {
var res = this.responseText;
var json = JSON.parse(res);
if (json.code == 200) {
englishTextArea.value = json.text[0];
}
else {
englishTextArea.value = "Error Code: " + json.code;
}
}
}
}
// When document ready
$(document).ready(function () {
lwsAddContent(lwsActivateContent);
});
})();
控制台看起来像这样，如果我尝试点击并选择一些内容，则不会添加条目：
控制台日志
contentScript.js:9 lwsAddContent()
contentScript.js:24 lwsActivateContent()
contentScript.js:45 lwsSetUpTextGetter()
contentScript.js:58 snapSelectionToWord()
contentScript.js:106 before callback...
如果有人能弄清楚我在这里做错了什么，那就太好了！谢谢！
答案 0 :(得分：-1)
document.onmouseup = snapSelectionToWord(lwsGetText);
更改为
document.onmouseup = snapSelectionToWord;
您应该分配功能，而不是功能调用。同样作为snapSelectionToWord中的第一个参数，您将收到event个对象。