Twitter Bootstrap typeahead: get context / calling element with `this`

Twitter Bootstrap typeahead: get context / calling element with `this`

I am using the Typeahead component of Twitter Bootstrap 2.1.1, and jQuery 1.8.1
I am trying to access the text box element from within typeahead’s updater function. Here is my current code, which works great:
$(‘#client-search’).typeahead({
source: function (query, process) {
$.get(url, { query: query }, function (data) {
labels = [];
mapped = {};
$.each(data, function(i,item) {
mapped[item.label] = item.value;
labels.push(item.label);
});
process(labels);
});
}
,updater: function (item) {
$(‘#client-id’).val(mapped[item]);
return item;
}
,items: 10
,minLength: 2
});

I have many typeahead search boxes on the same page. Each search box has an id #xxx-search and a corresponding hidden input with id #xxx-id. I’d like to re-use the same code for everything by doing something like this:
$(‘#client-search, #endClient-search, #other-search’).typeahead({

,updater: function (item) {
var target = $(this).attr(‘id’).split(‘-‘)[0] + ‘-id’;
$(‘#’+target).val(mapped[item]);
return item;
}

I thought that this would refer to the text box element in use, but apparently not, because I get an undefined error in firebug:
$(this).attr(“id”) is undefined

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When I use this instead of $(this), I get:
this.attr is not a function

Can anyone help make this work?

UPDATE: THE ANSWER, AND MORE!
Thanks to benedict_w’s answer below, not only does this work perfectly now, but I have also made this much better in terms of re-usability.
Here is what my s look like:

Notice how the search box references the hidden id. Here’s the new js:
$(‘:input[data-typeahead-url]’).each(function(){
var $this = $(this);
$this.typeahead({
source: function (query, process) {
$.get($this.attr(‘data-typeahead-url’), { query: query }, function (data) {
labels = [];
mapped = {};
$.each(data, function(i,item) {
mapped[item.label] = item.value;
labels.push(item.label);
});
process(labels);
});
}
,updater: function (item) {
$(‘#’+$this.attr(‘data-typeahead-target’)).val(mapped[item]);
return item;
}
,items: 10
,minLength: 2
});
});

Solutions/Answers:

Solution 1:

You are inside another function so you need to save a reference to the element in the outer closure, this can then be passed into the event handler of the inner closure. You can do that using an $.each() call to loop through the selector saving a reference to the element (this) each time – e.g.

$('#client-search, #endClient-search, #other-search').each(function() {
    var $this = $(this);
    $this.typeahead({
        ...

        ,updater: function (item) {
            var target = $this.attr('id').split('-')[0] + '-id';
            $('#'+target).val(mapped[item]);
            return item;
        }
        ...
     });

Solution 2:

The accepted answer is a good one, but just wanted to share an alternative that doesn’t actually require the outer closure. I’m using bootstrap v2.3.1 and the input is available to you from this.$element.

Eg:

$(':input[data-typeahead-url]').typeahead({
    source: function (query, process) {
        $.get(this.$element.attr('data-typeahead-url'), { query: query }, function (data) {
            labels = [];
            mapped = {};
            $.each(data, function(i,item) {
                mapped[item.label] = item.value;
                labels.push(item.label);
            });
            process(labels);
        });
    }
    ,updater: function (item) {
        $('#'+this.$element.attr('data-typeahead-target')).val(mapped[item]);
        return item;
    }
    ,items: 10
    ,minLength: 2
});

References

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