如何解决使用链接集合而不是文本时，RSS 编辑器不打勾：出了什么问题？
我正在使用以下解决方案： https://www.cssscript.com/rss-feed-scroller-marquee/ 为了为我的网页创建一个tickler。一切都很好，但事实上，tickler 只是显示了 rss 提要的文本，但无法单击它们以访问文章。 所以我试图篡改它来构建一个正确的 url 并尝试为其设置动画。然而，该项目似乎构造良好，但是当我为其设置动画时，什么也没有发生。 这是修改后的js类的代码：
/*!
* RSS Marquee
*
* Licensed under MIT
* Copyright (c) 2020 [Samuel Carreira]
*/
class RSSMarquee {
/**
*
* @param {string[]} feedURLs Feed URLs
* @param {object} elementContainer the selector of the marquee container
* @param {number} options.speed duration in ms per character. Bigger values = slow speed
* @param {number} options.maxItems specify max number of titles to show (useful to debug)
* @param {object} options.hostnameSelector The selector of the element where you want to show the URL of the news feed source (usefull for copyright atttribution)
*/
constructor(feedURLs,elementContainer,options = { speed: 110,maxItems: null,hostnameSelector: null }) {
this._feedURLs = new Array();
if (Array.isArray(feedURLs)) {
this._feedURLs = feedURLs;
} else {
this._feedURLs[0] = feedURLs;
}
const URLvalidation = this._feedURLs.every(this.validateURL);
if (!URLvalidation) {
throw new TypeError('Invalid URL on list');
}
this._urlIndex = 0;
this._anim = null;
this._newsText = '';
this._lastTime = Date.now();
if (elementContainer === null) {
throw new TypeError('Invalid element selector');
}
this._elementContainer = elementContainer;
this.styleElementContainer();
this._options = {
speed: this.validateSpeed(options.speed),maxItems: options.maxItems,hostnameSelector: options.hostnameSelector,// ...options
};
this.getRSS();
}
validateSpeed(speed) {
if (!Number(speed) || speed < 50 || speed > 300) {
return 110; // default safe value
} else {
return speed;
}
}
/**
* Set the animation speed
* @param {number} speed value between 50-300
*/
set setSpeed(speed) {
this._options.speed = this.validateSpeed(speed);
}
get getSpeed() {
return this._options.speed;
}
/**
* Validate URL (uses URL interface)
*
* @param {string} url Url to check
* @returns {boolean} true if valid
*/
validateURL(url) {
try {
const u = new URL(url);
return true;
} catch (e) {
return false;
}
}
/**
* Get Hostname from url string
*
* Sample: "http://www.dnoticias.pt/rss/desporto.xml"
* returns -> www.dnoticias.pt
*
* @param {string} url url string
* @returns {string} hostname
*/
getHostname(url) {
try {
const u = new URL(url);
return u.hostname;
} catch (e) {
return '';
}
}
getRSS() {
const url = this._feedURLs[this._urlIndex];
this.fetchRSS(url)
.then((xmlText) => {
this._newsText = this.parseXMLFeed(xmlText);
this.showMarquee(this._newsText);
this.showHostname(url);
})
.catch((err) => {
console.error(err);
this.handleErrors();
});
}
handleErrors() {
const diffTime = Date.now() - this._lastTime;
if (diffTime > 5000) {
console.log('Trying next feed URL...');
this.nextURL();
this._lastTime = Date.now();
} else {
if (this._newsText === '') {
console.log('delay...');
setTimeout(() => {
this.nextURL();
},5000);
} else {
console.log('show again cached saved news');
this.showMarquee(this._newsText);
}
}
}
nextURL() {
this.increaseIndex();
this.getRSS();
}
styleElementContainer() {
this._elementContainer.style.overflow = 'hidden';
this._elementContainer.style.whiteSpace = 'nowrap';
}
showHostname(url) {
if (!this._options.hostnameSelector) {
return;
}
this._options.hostnameSelector.innerText = this.getHostname(url);
}
showMarquee(aCollection) {
try {
const animKeyframes = [{
transform: 'translateX(0)'
},{
transform: 'translateX(-100%)'
}
];
const animOptions = {
duration: 25000,// The number of milliseconds each iteration of the animation takes to complete. Defaults to 0. Although this is technically optional,keep in mind that your animation will not run if this value is 0.
easing: 'linear',// The rate of the animation's change over time. Accepts the pre-defined values "linear","ease","ease-in","ease-out",and "ease-in-out",or a custom "cubic-bezier" value like "cubic-bezier(0.42,0.58,1)". Defaults to "linear".
iterations: 1,// The number of times the animation should repeat. Defaults to 1,and can also take a value of Infinity to make it repeat for as long as the element exists.
delay: 0,// The number of milliseconds to delay the start of the animation. Defaults to 0.
endDelay: 0 // The number of milliseconds to delay after the end of an animation. This is primarily of use when sequencing animations based on the end time of another animation. Defaults to 0.
};
animOptions.duration = aCollection.length * this._options.speed;
const elementChildNode = document.createElement('span');
elementChildNode.style.display = 'inline-block';
elementChildNode.style.paddingLeft = '100%';
//const textNode = document.createTextNode(text);
console.log(aCollection.lenght);
aCollection.forEach(function(item,index,array) {
elementChildNode.appendChild(item)
})
console.log("totale:");
console.log(elementChildNode);
//elementChildNode.appendChild(textNode);
//this._elementContainer.appendChild(elementChildNode);
this._anim = elementChildNode.animate(animKeyframes,animOptions);
console.log('start animation');
this._anim.onfinish = () => {
console.log('end');
while (this._elementContainer.firstChild) {
this._elementContainer.firstChild.remove();
}
delete this._anim.onfinish;
this.nextURL();
};
this._lastTime = Date.now();
} catch (err) {
console.error(err);
}
}
increaseIndex() {
this._urlIndex += 1;
if (this._urlIndex > this._feedURLs.length - 1) {
this._urlIndex = 0;
}
}
/**
* Fetch RSS
* @param {string} feedURL RSS XML url
*/
fetchRSS(feedURL) {
return new Promise((resolve,reject) => {
console.info(`Start fetching ${feedURL}...`);
fetch(feedURL,{ mode: 'cors',redirect: 'follow' })
.then((response) => {
return response.text();
})
.then((xmlTxt) => {
return resolve(xmlTxt);
})
.catch(() => {
console.error('Error in fetching the RSS feed');
reject();
})
});
}
/**
* Parses RSS XML feed
*
* - Select title elementContainer
* - add dot separator between "headlines"
* - remove <![CDATA[ string
* - remove html tags
*
* @param {string} xmlText
* @returns {string} parsed feed
*/
parseXMLFeed(xmlText) {
try {
const parser = new DOMParser();
const doc = parser.parseFromString(xmlText,"text/xml");
let news = '';
let aCollection=[];
let totals = 0;
for (let item of doc.querySelectorAll('item')) {
let title = item.getElementsByTagName("title")[0].childNodes[0].nodeValue;
// let description = item.getElementsByTagName("description")[0].childNodes[0].nodeValue;
let link = item.getElementsByTagName("link")[0].childNodes[0].nodeValue;
if (title) {
if (news.length) {
news += '\xa0' + ' • ' + '\xa0';
}
title = this.remoteCData(title);
title = this.stripTags(title);
news += title;
var a = document.createElement('a');
var linkText = document.createTextNode(title);
a.appendChild(linkText);
a.title = title;
a.href = link;
aCollection.push(a);
totals += 1;
}
if (this._options.maxItems !== null && totals >= this._options.maxItems) {
console.info('Maximum items reached!');
break;
}
}
//console.log(aCollection);
//console.log(news);
console.info(`Parsed ${totals} title(s)`);
return aCollection;
} catch (err) {
console.error(err);
return ' ';
}
}
stripTags(textWithTags) {
return textWithTags.replace(/<(.|\n)*?>/g,'');
}
remoteCData(originalText) {
return originalText.replace("<![CDATA[","").replace("]]>","");
}
}
未发生的动画在函数中：showMarquee(aCollection)。 原始站点显示了如何对其进行测试。
谢谢，
解决方法
问题是由于评论： this._elementContainer.appendChild(elementChildNode); 此外，我不得不通过修改来调整速度：
animOptions.duration = aCollection.length * this._options.speed*10;
最后恢复点来分隔项目。
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