我正在使用代码来突出显示用 html5 音频读取的文本单词,并在单击相邻句子时也读取音频。
我需要的是让正在读取的行从页面中消失,并且正在读取的下一行跳转到它的位置,等等......所以到最后页面中什么都没有留下,但是:1-音频播放器,2-“突出显示开/关”按钮,3-“滚动开/关”按钮。
因此页面中有两个选项,用户希望在阅读时同时看到所有文本,或者只看到正在听到的行(以及它下面的行)。
正在使用的代码是:
var textHighlightOn = true,
btnToggle = document.getElementById('toggleTxt'),
textDiv = document.querySelector('.text-highlight')
spns = document.querySelectorAll('span'),
audi = document.getElementById("adi");
audi.addEventListener("timeupdate", f1);
function f1(){
// remove all previous actives;
[].forEach.call(spns, function(e){
e.classList.remove('active');
e.classList.remove('active-prev');
});
var i;
for (i = 0 ; i< spns.length ; i++){
var time = Number(spns[i].id.slice(2));
if(time < audi.currentTime){
if (i>0) {
spns[i-1].classList.remove('active');
spns[i-1].classList.add('active-prev');
}
spns[i].classList.add('active');
}
}
}
// listen for clicks on the spans.
[].forEach.call(spns, function(spn) {
spn.addEventListener("click", function() {
for(var i in spns){
}
var time = Number(this.id.slice(2));
audi.currentTime = time;
});
});
// Toggle text highlight
btnToggle.addEventListener("click", function(){
if(textHighlightOn){
textDiv.classList.add('off');
} else {
textDiv.classList.remove('off');
}
this.innerHTML = 'Highlight ' + (textHighlightOn ? 'off ' : ' on');
textHighlightOn = !textHighlightOn;
});
body {
background: #008000;
}
.text-highlight span.active-prev {
background: #fff;
}
.text-highlight span.active {
background: #03a9f4;
}
.text-highlight.off span {
background: transparent;
}
<audio id="adi" controls>
<source src="https://ia802508.us.archive.org/5/items/testmp3testfile/mpthreetest.mp3"/>
</audio>
<button id="toggleTxt">Highlight on</button>
<div class="text-highlight">
<pre>
<span id="ts0.5">Ok, we're trying this for a second time</span> ,
<br><span id="ts3">to test the ability</span>
<br><span id="ts6">to upload an M P</span>
<br><span id="ts9">3 file.</span>
<br><span id="ts10">Hopefully this will work!</span>
</pre>
</div>
最佳答案
这应该可以做到。
var
// Controlls
textHighlightOn = true,
showAllTxt = true,
btnToggle = document.getElementById('toggleTxt'),
btnToggleShowTxt = document.getElementById('toggleShowTxt'),
textDiv = document.querySelector('.text-highlight'),
spns = document.querySelectorAll('span'),
audi = document.getElementById("adi");
audi.addEventListener("timeupdate", f1);
function f1(){
// remove all previous actives;
[].forEach.call(spns, function(e){
e.classList.remove('active');
e.classList.remove('active-prev');
});
var i;
for (i = 0 ; i< spns.length ; i++){
var time = Number(spns[i].id.slice(2));
if(time < audi.currentTime){
if (i>0) {
spns[i-1].classList.remove('active');
spns[i-1].classList.add('active-prev');
}
spns[i].classList.add('active');
}
}
}
// listen for clicks on the spans.
[].forEach.call(spns, function(spn) {
spn.addEventListener("click", function() {
for(var i in spns){
}
var time = Number(this.id.slice(2));
audi.currentTime = time;
});
});
// Toggle text highlight
btnToggle.addEventListener("click", function(){
if(textHighlightOn){
textDiv.classList.add('off');
} else {
textDiv.classList.remove('off');
}
this.innerHTML = 'Highlight ' + (textHighlightOn ? 'off ' : ' on');
textHighlightOn = !textHighlightOn;
});
//
btnToggleShowTxt.addEventListener("click", function(){
if(showAllTxt){
textDiv.classList.remove('show-all');
} else {
textDiv.classList.add('show-all');
}
this.innerHTML = 'See All Text ' + (showAllTxt ? 'off ' : ' on');
showAllTxt = !showAllTxt;
});
body {
background: #008000;
}
span {
padding:0;
margin:0;
}
.text-highlight span {
display:block;
margin-bottom:1px;
}
.text-highlight span.active-prev {
display:none;
background:#fff;
}
.text-highlight span.active {
background: #03a9f4;
display:block;
}
.text-highlight.show-all span {
display:block !important;
}
/* turn off highlight */
.text-highlight.off span {
background: transparent;
}
<audio id="adi" controls>
<source src="https://ia802508.us.archive.org/5/items/testmp3testfile/mpthreetest.mp3"/>
</audio>
<button id="toggleTxt">Highlight on</button>
<button id="toggleShowTxt">See All Text on</button>
<div class="text-highlight show-all">
<span id="ts0.5">Ok, we're trying this for a second time,</span>
<span id="ts3">to test the ability</span>
<span id="ts6">to upload an M P</span>
<span id="ts9">3 file.</span>
<span id="ts10">Hopefully this will work!</span>
</div>
关于javascript - 向上滚动文本并在使用 html5 音频读取文本时将其隐藏,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/46603956/