[英]Why part of function does not run?
我正在編寫一個簡單的Web應用程序,以跟蹤和顯示一些數據。 我有多個html頁面,並且我有一些Javascript可控制html的功能。
問題在於下面的函數似乎並沒有一直運行。
我已經更改了工作流程的一般順序,並且完成了調試(據我所知)。
function sidebarColour() {
let page = document.getElementsByTagName('a');
let currentURL = window.location.href;
console.log(page, currentURL);
for (let tag of page) {
console.log(tag.href);
if (tag.href == currentURL) {
tag.className = 'bar-item button padding blue';
console.log(tag.href, tag.className);
} else {
tag.className = 'bar-item button padding';
}
}
}
sidebarColour();
該代碼似乎一直運行,直到到達for
循環為止。 console.log
的不出現( tag.ref
不出現)如果我將代碼復制粘貼到chrome dev-tool上的控制台中,則元素更改的css可能會發生。
有任何想法嗎?
您網站上的問題是側邊欄是異步獲取的。 您的include.js
包含以下代碼:
function includeHTML() {
let z, i, elmnt, file, xhttp;
/* Loop through a collection of all HTML elements: */
z = document.getElementsByTagName("*");
for (i = 0; i < z.length; i++) {
elmnt = z[i];
/*search for elements with a certain atrribute:*/
file = elmnt.getAttribute("w3-include-html");
if (file) {
/* Make an HTTP request using the attribute value as the file name: */
xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4) {
if (this.status == 200) {
elmnt.innerHTML = this.responseText;
}
if (this.status == 404) {
elmnt.innerHTML = "Page not found.";
}
/* Remove the attribute, and call this function once more: */
elmnt.removeAttribute("w3-include-html");
includeHTML();
}
}
xhttp.open("GET", file, true);
xhttp.send();
/* Exit the function: */
return;
}
}
}
function sidebarColour() {
let page = document.getElementsByTagName('a');
let currentURL = window.location.href;
console.log(page, currentURL);
for (let tag of page) {
if (tag.href == currentURL) {
tag.className = 'bar-item button padding blue';
console.log(tag.href, tag.className)
} else {
tag.className = 'bar-item button padding';
}
}
}
includeHTML();
sidebarColour();
將sidebarColour的方法調用移到onreadystatechange
的回調中應該可以修復該方法。
像這樣做:
function includeHTML() {
let z, i, elmnt, file, xhttp;
/* Loop through a collection of all HTML elements: */
z = document.getElementsByTagName("*");
for (i = 0; i < z.length; i++) {
elmnt = z[i];
/*search for elements with a certain atrribute:*/
file = elmnt.getAttribute("w3-include-html");
if (file) {
/* Make an HTTP request using the attribute value as the file name: */
xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function () {
if (this.readyState == 4) {
if (this.status == 200) {
elmnt.innerHTML = this.responseText;
sidebarColour();
}
if (this.status == 404) {
elmnt.innerHTML = "Page not found.";
}
/* Remove the attribute, and call this function once more: */
elmnt.removeAttribute("w3-include-html");
includeHTML();
}
}
xhttp.open("GET", file, true);
xhttp.send();
/* Exit the function: */
return;
}
}
}
function sidebarColour() {
let page = document.getElementsByTagName('a');
let currentURL = window.location.href;
console.log(page, currentURL);
for (let tag of page) {
if (tag.href == currentURL) {
tag.className = 'bar-item button padding blue';
console.log(tag.href, tag.className)
} else {
tag.className = 'bar-item button padding';
}
}
}
includeHTML();
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