Playing an audio html tag is not working

I am using ASP.NET Webforms with the following ASPX code:

<asp:GridView ID="gvWordsInLessons"
    runat="server"
    AllowSorting="True"
    AutoGenerateColumns="False"
    <Columns>
        <asp:TemplateField>

                <img runat="server" src="https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/apps/kpackage.png"  onclick="return PlaySoundDonoV2(this);" data-audio-index='<%# CType(Container, GridViewRow).RowIndex %>'  />
                <audio
                    class="audio-file"
                    style="display:none;"
                    data-row-index="<%# CType(Container, GridViewRow).RowIndex %>"
                    src="<%# Eval("VoiceOver") %>"
                    autostart="false">
                </audio>
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

which ultimately produces HTML of the following:

        function PlaySoundDonoV2(aSelectedImg) {
            var rowIndex = $(aSelectedImg).attr('data-audio-index');

            var sound = $(".audio-file[data-row-index='" + rowIndex + "']");
            sound.play();

            //Prevent post-back
            return false;
        }
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<table class="table table-bordered table-condensed table-hover table-striped" cellspacing="0" rules="all" border="1" id="cphContainerWithoutUpdatePanel_gvWordsInLessons" style="border-collapse:collapse;">
      <tr>
        <td>
        <img src="https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/apps/kpackage.png" onclick="return PlaySoundDonoV2(this);" data-audio-index="0" /> 
        <audio class="audio-file" style="display:none;" data-row-index="0" src="/Chinese/words/begin.mp3"
        autostart="false"></audio></td>
      </tr>
      <tr>
        <td>
        <img src="https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/apps/kpackage.png" onclick="return PlaySoundDonoV2(this);" data-audio-index="1" /> 
        <audio class="audio-file" style="display:none;" data-row-index="1" src="/Chinese/words/buy.mp3"
        autostart="false"></audio></td>
      </tr>
    </table>

Now while I am finding the audio tag whenever I attempt to play it I get the following error:

{
  "message": "Uncaught TypeError: sound.play is not a function",
}

Testing this on a vanilla HTML page works. So I am guessing that even though I am finding the audio tag it is no longer recognised as audio? Or perhaps the ASPX render engine is getting things messed up because the audio tag has a runat="server".

Can someone help me out in terms of getting this to play>

Answers 1

  • jQuery selector returns a jQuery object. You need to access the DOM element in order to access WebAudio APIs. You can use .get() to get the DOM element.

    // use .get(0) to the DOM element.
    var sound = $(".audio-file[data-row-index='" + rowIndex + "']").get(0); 
    sound.play();
    

    function PlaySoundDonoV2(aSelectedImg) {
      var rowIndex = $(aSelectedImg).attr('data-audio-index');
      var sound = $(".audio-file[data-row-index='" + rowIndex + "']").get(0);
      console.log(sound);
      sound.play();
      //Prevent post-back
      return false;
    }
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
    <table class="table table-bordered table-condensed table-hover table-striped" cellspacing="0" rules="all" border="1" id="cphContainerWithoutUpdatePanel_gvWordsInLessons" style="border-collapse:collapse;">
      <tr>
        <td>
          <img src="https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/apps/kpackage.png" onclick="return PlaySoundDonoV2(this);" data-audio-index="0" />
          <audio class="audio-file" style="display:none;" data-row-index="0" src="https://actions.google.com/sounds/v1/cartoon/cartoon_boing.ogg" autostart="false"></audio></td>
      </tr>
      <tr>
        <td>
          <img src="https://cdn1.iconfinder.com/data/icons/CrystalClear/16x16/apps/kpackage.png" onclick="return PlaySoundDonoV2(this);" data-audio-index="1" />
          <audio class="audio-file" style="display:none;" data-row-index="1" src="https://actions.google.com/sounds/v1/alarms/alarm_clock.ogg" autostart="false"></audio></td>
      </tr>
    </table>


Related Articles