从Web服务下载文件后，使用Web浏览器控件在html中播放Java脚本时的奇怪行为

Question

For last 2-3 weeks i am looking for a reason behind my problem. But unfortunately i could not found anything needed.

It is a Windows Phone Book reader application i am creating using c# and xaml .

For that i need to download book file from the web service and extract and save audio,image and html data from it. All data are stored in local folder.

The main functionality is that we can see highlighting of texts with the corresponding audio plays. And the high lighting functionality is done by java script function.

My problem is that the highlighting text is delaying some times and it doesn't meet with it's audio. And this is happening on the session where the book data downloaded from network or where download operation took place.

Is there anything related to network download operation can prevent/delay the execution of java script function ?

Can network download operation makes any impact on Web browser control ?

Answer 1

If you use callback functions in JS the right way the function of eg. highlighting will start only after the loading is complete. This issue reminds me of a few things I have seen while toying with nodeJS that uses about 80% async functions and a loop. However, if you want to get things structured in JS you might want to have a look at RequireJS, but async func calls can be used anyways..

function highlightElement(element, function(){
  // Load document here, once this operation is done, highlighting will start
}) {
  element.addClass('active');
};