jQuery min/max property from array of elements

Question

Is there a simple way to find the min/max property from an array of elements in jQuery?

I constantly find myself dynamically resizing groups of elements based on the

Answer 1

I wrote a simple plugin to do exactly this - see gregbrown.co.nz/code/jquery-aggregate . With it installed, you could do:

var maxWidth = $('img').aggregate('width', 'max');

Answer 2

Take a look at the calculation plugin, maybe it can help you with your problems. They offer a number of math functions, like min, max and avg on DOM-elements.

Examples:

$("input[name^='min']").min();
$("input[name^='max']").max();

Answer 3

You can use native "sort" function to have more control over which elements are compared

Array.prototype.deepMax = function(comparator){
  if(typeof comparator === 'function'){
    var sorted = this.slice(0).sort(comparator);
    return sorted[sort.length - 1];
  }
  return Math.max.apply(Math, this);
};

and you can call it like

var maxWidth = $('img').deepMax(function(a, b){
  //-1 if a < b; +1 otherwise
  return $(a).width() - $(b).width();
});

OR

you can use _.max of Underscore which is can be implemented like...

Array.prototype.max = function(iterator){
  if(!iterator && obj[0] === +obj[0])
    return Math.max.apply(Math, this);
  var result = -Infinity, lastComputed = -Infinity;
  this.forEach(function(value, index){
    var computed = iterator ? iterator(value, index, this) : value;
    computed > lastComputed && (result = value, lastComputed = computed);
  });
  return result;
};

var maxWidth = $('img').max(function(val){ return $(val).width();});

Answer 4

Rolled up as a plugin to return min-max of width and height:

// Functions to get the Min & Max value in Array

if (!Array.min) { Array.min = function( array ){return Math.min.apply( Math, array )} }
if (!Array.max) { Array.max = function( array ){return Math.max.apply( Math, array )} }

(function( $ ){     // Standard jQuery closure to hide '$' from other libraries.

    // jQuery plug-in to get the min and max widths of a set of elements

    $.fn.dimensionsMinMax = function(whnx) {

    /*
    ################################################################################

    Name
    ====

        dimensionsMinMax(whnx) - jQuery plug-in to get min & max width & height

    Parameters
    ==========

        whnx - A 4-element array to receive the min and max values of the elements:
            whnx[0] = minimum width;
            whnx[1] = maximum width;
            whnx[2] = minimum height;
            whnx[3] = maximum height.

    Returns
    =======

        this - so it can be "chained".

    Example
    =======

        var minmax = new Array(4);
        var number_of_images = $('img').dimensionsMinMax(minmax).class('abc').length;
        console.log('number of images = ', number_of_images);
        console.log('width  range = ', minmax[0], ' to ', minmax[1]);
        console.log('height range = ', minmax[2], ' to ', minmax[3]);

    ################################################################################  
    */
        var  widths = new Array(this.length);
        var heights = new Array(this.length);

        this.each(function(i){
            $this      = $(this);
             widths[i] = $this.width();
            heights[i] = $this.height(); 
        });

        whnx[0] = Array.min( widths);
        whnx[1] = Array.max( widths);
        whnx[2] = Array.min(heights);
        whnx[3] = Array.max(heights);

        return this;
    }

})( jQuery );   // End of standard jQuery closure.

Answer 5

The Plugins/Authoring page actually has an example for determining the tallest element.

It's basically what you have here, just rolled into a plugin for easy access. Maybe you could appropriate it for your uses.

Answer 6

Use Fast JavaScript Max/Min - John Resig

Example with three logos of google, yahoo and bing.

HTML

<img src="http://www.google.co.in/intl/en_com/images/srpr/logo1w.png" alt="Google Logo" /><br/>
<img src="http://l.yimg.com/a/i/ww/met/yahoo_logo_in_061509.png" alt="Yahoo Logo" /><br/>
<img src="http://www.bing.com/fd/s/a/h1.png" alt="Bing Logo" />

Javascript

$(document).ready(function(){
    // Function to get the Max value in Array
    Array.max = function( array ){
        return Math.max.apply( Math, array );
    };

    // Function to get the Min value in Array
    Array.min = function( array ){
       return Math.min.apply( Math, array );
    };

    //updated as per Sime Vidas comment.
    var widths= $('img').map(function() {
        return $(this).width();
    }).get();

    alert("Max Width: " + Array.max(widths));
    alert("Min Width: " + Array.min(widths));
});

P.S: jsfiddle here