单击文本单词以读取相邻的html5音频文件

Question

我正在使用代码突出显示使用html5音频读取的文本单词，并且它当前突出显示正在读取的句子。现在我也需要它来执行以下操作（另一个选项）：当我单击该句子时，它会跳转到音频的相邻部分并播放它。

使用的代码是：

＆＃13;

＆＃13;

var textHighlightOn = true,
    btnToggle = document.getElementById('toggleTxt'),
    textDiv   =  document.querySelector('.text-highlight')
    spns = document.getElementsByTagName("SPAN"),
    audi = document.getElementById("adi");

audi.addEventListener("timeupdate", f1);

function f1(){
  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');
      
    }
  }
}

btnToggle.addEventListener("click", function(){

    if(textHighlightOn){
       textDiv.classList.add('off');
    } else {
       textDiv.classList.remove('off');
    }

    this.innerHTML = 'Highlight ' + (textHighlightOn ? 'off ' : ' on');         

    textHighlightOn = !textHighlightOn;

});

＆＃13;

body {
  background: #008000;
}
.text-highlight span.active-prev {
   background: #fff;
}
.text-highlight span.active {
   background: #03a9f4;
}
.text-highlight.off span {
   background: transparent;
}

＆＃13;

<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>

＆＃13;

＆＃13;

＆＃13;

Answer 1

我建议加载jQuery以使代码更具可读性。

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>