How to match and point to a particular data in array in Blogger

问题

As I asked in a previous question and I got a good and working answer :
How to store the URL's and Titles of a list of posts under same label into a String array in Blogger

Now I want to know how to make a variable point or get the index number of the particular url.

Suppose I use var cURL="<data:post.url>" to store the URL of the post I am currently browsing on the blog into cURL variable.

Supposedly the blog post I have currently opened happens to be:

http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-3-raw.html

And the variable cURL stores this URL. I want a code to search and match this URL in a array which I have stored a number of URL's

Now if the value of cURL is as already above

If the array is var URLArray and its data with index happens to be:

URLArray[0]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-1-raw.html
URLArray[1]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-2-raw.html
URLArray[2]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-3-raw.html
URLArray[3]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-4-raw.html
URLArray[4]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-5-raw.html
URLArray[5]=http://rawmangaread.blogspot.in/2017/03/himekishi-ga-classmate-chapter-6-raw.html

As highlighted in bold above, the URL in URLArray[2] matches the URL stored in cURL. Now I want this Index number 2 stored in a variable.
Since blogger doesn't allow normal java for loops, I don't know how to do it.

回答1:

You can use the JavaScript method findIndex() for this purpose. The code for same will be of the form

<script>
  var URLArray = <b:eval expr='data:posts map (post =&gt; post.url)'/>;
  var cURL = "<data:post.url/>";

  function IndexFinder(element,index) {
    return element == cURL
  }

  var storeIndex = URLArray.findIndex(IndexFinder);
</script>

回答2:

To get index number through loop use index attribute as in the following example :

<b:loop index='i' values='data:posts' var='post'>

    <data:i/> : <data:post.url/>

</b:loop>

Notes :

i can be any name you choose.
Loop index starts from zero.

Javascript version :

<script type="text/javascript">
    var URLArray = [];
    <b:loop index='i' values='data:posts' var='post'>
        URLArray[<data:i/>] = <data:post.url/>;
    </b:loop>
</script>

来源：https://stackoverflow.com/questions/43154669/how-to-match-and-point-to-a-particular-data-in-array-in-blogger

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