Get an array of links from a specific wiki article

Question

I am toying around with the wiki API and trying to have an array of links from a given article returned. This is the kind of JSON i am working with:

{
  "continue": {
    "plcontinue": "22989|0|2007_Rugby_World_Cup",
    "continue": "||"
  },
  "query": {
    "normalized": [
      {
        "from": "paris",
        "to": "Paris"
      }
    ],
    "pages": {
      "22989": {
        "pageid": 22989,
        "ns": 0,
        "title": "Paris",
        "links": [
          {
            "ns": 0,
            "title": ", Île-de-France, Seine, Kingdom of France"
          },

As you can see I need to know the pageId for me to access the links array that I need. I tried extracting it from the plcontinue value and then have it inserted later in my code, but it returns an undefined.

This is my API request:

$.ajax({
        url: "https://en.wikipedia.org/w/api.php?action=query&titles=" + searchTerm + "&pllimit=50&prop=links&format=json",
        method: "GET",
        dataType: "jsonp" //allow CORS
    }).then(function (data) {
        var plcontinueArray = data.continue.plcontinue.split("|")
        var pageId = plcontinueArray[0];
        var links = data.query.pages.pageId.links;

How do i access the array of links when i do not know the pageId before making the request?

Just iterate over pages and get each of them. `for (pageid in data.query.pages) ... ` and then get `data.query.pages[pageid].links`. — GolezTrol, Aug 17 '17 at 08:51
I'd suggest to access it by `data.query.pages[pageId].links`. — gus27, Aug 17 '17 at 08:52
Possible duplicate of [Iterate through object properties](https://stackoverflow.com/questions/8312459/iterate-through-object-properties) — GolezTrol, Aug 17 '17 at 08:52

score 2 · Accepted Answer · answered Aug 17 '17 at 08:51

In the same way that you use dot notation to access the data in an object, you can also use an index like method to access keys of an object.

For example:

var obj = { foo: "bar", spam: "eggs" };
var value1 = obj.foo; // value1 = "bar"
var keyName = "spam";
var value2 = obj[keyName]; // value12 = "eggs"

So for your example, you would do something like this -

...
var pageId = plcontinueArray[0];
var links = data.query.pages[pageId].links;

score 0 · Answer 2 · answered Aug 17 '17 at 08:53

0

You are accessing the pageId incorrectly -

Change this line - var links = data.query.pages.pageId.links; to var links = data.query.pages[pageId].links;

answered Aug 17 '17 at 08:53

Ashvin777

1,446
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19

score 0 · Answer 3 · answered Aug 17 '17 at 08:54

You could just loop through the pages object with a for ... in loop. Something like this:

...

then(function (data) {
    for(var pageId in data.query.pages) {
       if (data.query.pages.hasOwnProperty(pageId)) {
            console.log(data.query.pages[pageId].links);
       }
    }
});

Hope it helps.

Get an array of links from a specific wiki article

3 Answers3