[英]How to check if jQuery object exist in array?
Given an item
and an array
, I would like to know if item
exist in array
. 给定一个item
和一个array
,我想知道item
存在于array
。
item
is a jQuery object, eg $(".c")
. item
是一个jQuery对象,例如$(".c")
。 You can assume that item.length == 1
. 您可以假设item.length == 1
。
array
is an array of jQuery objects, eg [$(".a"), $(".b")]
. array
是jQuery对象的数组,例如[$(".a"), $(".b")]
。 Each item in this array may represent 0, 1, or more objects. 此数组中的每个项目可以表示0,1或更多对象。
Here is how I thought to implement this: ( live demo here ) 以下是我想要实现的方法:( 现场演示 )
function inArray(item, arr) {
for (var i = 0; i < arr.length; i++) {
var items = $.makeArray(arr[i]);
for (var k = 0; k < items.length; k++) {
if (items[k] == item[0]) {
return true;
}
}
}
return false;
}
Can you find a more elegant implementation? 你能找到更优雅的实现吗?
Example: 例:
HTML: HTML:
<div class="a">Hello</div>
<div class="a">Stack</div>
<div class="a">Overflow</div>
<div class="b">Have</div>
<div class="b">a</div>
<div class="b">nice</div>
<div class="b">day!</div>
<div class="c">Bye bye</div>
JS: JS:
console.log(inArray($(".a").eq(2), [$(".a"), $(".b")])); // true
console.log(inArray($(".b").eq(3), [$(".a"), $(".b")])); // true
console.log(inArray($(".c"), [$(".a"), $(".b")])); // false
console.log(inArray($(".a").eq(2), [$(".b")])); // false
console.log(inArray($(".a").eq(2), [])); // false
console.log(inArray($(".c"), [$("div")])); // true
According to Felix's suggestion: 根据费利克斯的建议:
[$(selector1), $(selector2), ... ]
can be simplified to [$(selector1), $(selector2), ... ]
可以简化为
$(selector1, selector2, ...)
or 要么
$(selector1).add(selector2)...
and then it can be implemented as: 然后它可以实现为:
function inArray(item, arr) {
return (arr.index(item) != -1);
}
what about 关于什么
if(jQuery.inArray(some, array) === -1)
{
//process data if "some" is not in array
}
else
{
//process if "some" is in array
}
read here : http://api.jquery.com/jQuery.inArray/ 在这里阅读: http : //api.jquery.com/jQuery.inArray/
if($.inArray("valueYouWantToFind", nameOfTheArray) == true) {
Your code;
}
Eg.,
var userChoice = ["yes"];
if($.inArray('yes',userChoice) == true) {
alert("found");
}
console.log(!!~$.inArray("a", ["a", "b", "c"]));
data = [
{val:'xxx',txt:'yyy'},
{val:'yyy',txt:'aaa'},
{val:'bbb',txt:'ccc'}
];
var dummyArray = [];
var distinctValueArray = [];
$.each(data, function (index, firstobject) {
//push first element of object in both dummy array and distinct array.
if (index == 0) {
distinctValueArray.push(firstobject);
dummyArray.push(firstobject.txt);
}
else {
//started from 2nd index.
if ($.inArray(firstobject.txt, dummyArray) == -1) {
distinctValueArray.push(firstobject);
}
dummyArray.push(firstobject.txt);
}
});
dummyArray.length=0;
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