What is the equivalent of .Max() in jquery
I was wondering how can we write a jquery statement to get the max value of a property of matched elements.
in LINQ we say something like this:
var maxHeight = list.Max(a=> a.Height);
what is the best way to do this in jquery?
as an example let's say we want to select the max numer开发者_运维百科ic value of all :text elements inside a container:
var allInputs = $("#container :text");
// how to get the max of parseInt(item.val())?
of course having a loop over all elements is an option but I'm curious to know if there is a magic to do with jquery.
Regards.
One of the possible solutions is to use map function and then Math.max to the result:
var values = $.map($("input:text"), function(el, index) { return parseInt($(el).val()); });
var max = Math.max.apply(null, values);
If it is needed it might be written in one line.
fiddle: http://jsfiddle.net/WuVLr/1/
UPDATE:
Alternatively you can apply map in this way:
var values = $("input:text").map(function(index, el) { return parseInt($(el).val()); }).get();
Based on all the conversation here and my search in the net we can say that (at this time) there is no robust built-in jquery way to calculate .max() and .min() of a property of elements matching a selector.
From what Igor suggested I came up with the following two jquery functions which you can add to your project if you need to use .max() and .min() functionalities over and over:
$.fn.max = function(selector) {
return Math.max.apply(null, this.map(function(index, el) { return selector.apply(el); }).get() );
}
$.fn.min = function(selector) {
return Math.min.apply(null, this.map(function(index, el) { return selector.apply(el); }).get() );
}
// Usage:
var maxWidth = $("a").max(function() {return $(this).width(); });
var minWidth = $("a").min(function() {return $(this).width(); });
See a demo here: http://jsfiddle.net/NF7v7/3/
This could be a non-direct solution for that using an array:
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
<script type="text/javascript">
$(document).ready(function() {
var mySizes=new Array();
$("input[type=text]").each(
function( intIndex ){
mySizes[intIndex] = $(this).val().length;
});
var largest = mySizes.sort(function(a,b){return a - b}).slice(-1);
alert("The maximun length is: " + largest);
});
</script>
</head>
<body>
<input type="text" value="Test"id="1"/>
<input type="text" value="Goodbye"id="2"/>
<input type="text" value="Bye"id="3"/>
<input type="text" value="Hello"id="4"/>
<input type="text" value="Hello world!"id="5"/>
<input type="text" value="Hi"id="6"/>
</body>
</html>
Regards
I am the author of the open source project http://www.jinqjs.com Using jinqJs you could do the following:
You could get the max by doing this:
var result = jinqJs().from([2,5,4,6,7,8,3]).orderBy([{sort: 'desc'}]).top(1).select();
or the min by doing this:
var result = jinqJs().from([2,5,4,6,7,8,3]).orderBy([{sort: 'desc'}]).bottom(1).select();
加载中,请稍侯......
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