javascript - $.text(["someText"]) - What does it mean? - Stack Overflow

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I've recently e across a code sample I had to use, and I was able to use it, but I didn't quite understand exactly what was going on.

Here's part of the code:

.sortElements(function(a, b){
    return $.text([a]) > $.text([b]) ? 
        inverse ? -1 : 1 
        : inverse ? 1 : -1;
}

I know that this function is deciding which element should be sorted first out of a and b, and I know that inverse is deciding the sort order, but I don't know what $.text([a]) is doing. Is it parsing a as text kind of like parseInt(a) and Date.parse(a)?

Google could not help me. I've also looked into the jQuery site and all I've found is

$(selector).text(), $(selector).text(newText) function.

Here's the Fiddle I'm basing my code from /

I've recently e across a code sample I had to use, and I was able to use it, but I didn't quite understand exactly what was going on.

Here's part of the code:

.sortElements(function(a, b){
    return $.text([a]) > $.text([b]) ? 
        inverse ? -1 : 1 
        : inverse ? 1 : -1;
}

I know that this function is deciding which element should be sorted first out of a and b, and I know that inverse is deciding the sort order, but I don't know what $.text([a]) is doing. Is it parsing a as text kind of like parseInt(a) and Date.parse(a)?

Google could not help me. I've also looked into the jQuery site and all I've found is

$(selector).text(), $(selector).text(newText) function.

Here's the Fiddle I'm basing my code from http://jsfiddle/gFzCk/

• javascript
• jquery

Share Improve this question Follow edited Dec 9, 2019 at 9:21 Subrata Sarkar 3,06488 gold badges4949 silver badges9494 bronze badges asked Feb 5, 2013 at 9:24 OwenOwen 4,41755 gold badges4343 silver badges5353 bronze badges 5

• 3 What plug-ins are you using? jQuery doesn't have a jQuery.text function at all (at least, not a documented one). (It has a text function of jQuery instances, but that's different.) – T.J. Crowder Commented Feb 5, 2013 at 9:30
• It's creating an array with the variable as it's only value - why is a very good question. – h2ooooooo Commented Feb 5, 2013 at 9:30
• 3 It looks like it's an undocumented function in jQuery for getting the text from element(s), without the need for a jQuery object containing them. So, assuming a is a DOM node with some text inside, $(a).text() and $.text([a]) are equivalent. See this jsFiddle example. – Anthony Grist Commented Feb 5, 2013 at 9:31
• 1 Sorry I should have given the example: jsfiddle/gFzCk – Owen Commented Feb 5, 2013 at 9:31
• 1 @owen add this fiddle to question – Devjosh Commented Feb 5, 2013 at 9:31

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5 Answers 5

Sorted by: Reset to default 9

jQuery.text does the heavy lifting for the implementation for the .text() method -- it seems to be an undocumented function with the core functionality for .text(), but missing some jQuery polish.

It's "imported" from Sizzle, where it appears as Sizzle.getText.

Inspecting the jQuery source will reveal that the $(selector).text() that you're familiar with, uses $.text internally:

jQuery.fn.extend({
    text: function( value ) {
        return jQuery.access( this, function( value ) {
            return value === undefined ?
                jQuery.text( this ) :
                this.empty().append( ( this[0] && this[0].ownerDocument || document ).createTextNode( value ) );
        }, null, value, arguments.length );
    },

It is an undocumented function (which means further jQuery revisions may drop it at will, without notifying you). You'll find its definition as such:

jQuery.text = Sizzle.getText;

Sizzle.getText, in turn, is documented as "Utility function for retrieving the text value of an array of DOM nodes". Seeing as Sizzle.getText is a documented feature, I would remend using that rather than the jQuery shorthand, as I don't expect jQuery to drop Sizzle any time soon.

This function, then, is the piece of code that yields the text content of a DOM node. Your sorting method is sorting DOM nodes by the alphabetical order of their text content. I don't know why the author has decided to get the text of an array containing only one element ([a]), rather than passing the element immediately (a), which would work equally well.

After looking at your jsfiddle it appears it's a function for getting the text from an element, simular to .text()

console.log(a) logged <td>28/02/2013</td>

While

console.log($.text[a]) logged 28/02/2013

If the code above does something useful (= there is no indication it does according to the jQuery documentation), then it probably calls .text() on a and b.

I'm wondering why the author didn't use $(a).text() because that should do the same. Maybe the code also works no matter whether a is a jquery wrapped node or not :-/

First of all, the brackets. if a is an element, [a] is a element array, so the calls to $.text(...) are passing an array as parameter.

I couldn't find any documentation about jQuery.text but only for jQuery.fn.text. However, you can see that the implementation of jQuery.text handles arrays as parameters as well as scalar values.

In this case, $.text([a]) is probably just the same as $.text(a).

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