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Find element in context using jQuery

I have this code in JS for jQuery:

<!DOCTYPE html>
<html>
<head>
    <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> 
    <title>test</title>
</head>
<body>

    <ul id="ul1">
            <li id="li11">11</li>
            <li id="li12">12</li>
            <li id="li13">13</li>
    </ul>

    <ul id="ul2">
            <li id="li21">21</li>
            <li id="li22">22</li>
            <li id="li23">23</li>
    </ul>

    <pre id="result"></pre>

</body>
</html>
<script>
$(function(){

    var liFind = $("#li21");
    var liFindDoc = document.getElementById("li21");

    var ul1 = $("#ul1");
    var ul2 = $("#ul2");

    $("#result").append( "li exist: "+$(liFind).length+", "+$(liFind).html()+"<br />");

    $("#result").append( "find ul 1 : "+$(ul1).find(liFind).length+"<br />");
    $("#result").append( "find ul 2 : "+$(ul2).find(liFind).length+"<br />");

    $("#result").append( "children ul 1 : "+$(ul1).children(liFind).length+"<br />");
    $("#result").append( "children ul 2 : "+$(ul2).children(liFind).length+"<br />");

    $("#result").append( "filter ul 1 : "+$(ul1).filter(liFind).length+"<br />");
    $("#result").append( "filter ul 2 : "+$(ul2).filter(liFind).length+"<br />");

    $("li").each(function(i,val){
        $("#result").append("li "+$(val).attr("id")+": "+(liFind==val)+" - "+(liFindDoc==val)+"<br />");

    });

    $(ul1).children().each(function(i,val){
        $("#result").append("children II ul 1 : "+(liFind==val)+" - "+(liFindDoc==val)+"<br />");
    });

    $(ul2).children().each(function(i,val){
        $("#result").append("children II ul 2 : "+(liFind==val)+" - "+(liFindDoc==val)+"<br />");
    });

    $(ul1).find("li").each(function(i,val){
        $("#result").append("find II ul 1 : "+(liFind==val)+" - "+(liFindDoc==val)+"<br />");
    });

    $(ul2).find("li").each(function(i,val){
        $("#result").append("find II ul 2 : "+(liFind==val)+" - "+(liFindDoc==val)+"<br />");
    });

$("#result").append("'SOLUTION' ::: closest li->ul: "+ $(liFind).closest('ul').attr("id") +"<br />");


});
</script>

and get this result:

  • eleven
  • 12
  • thirteen
  • 21
  • 22
  • 23

li : 1, 21
ul 1: 0
ul 2: 0
ul 1: 3
ul 2: 3
ul 1: 0
ul 2: 0
li li11: false - false
li li12: false - false
li li13: false - false
li li21: false - true
li li22: false - false
li li23: false - false
II ul 1: false - false
II ul 1: false - false
II ul 1: false - false
II ul 2: false - true
II ul 2: false - false
II ul 2: false - false
find II ul 1: false - false
find II ul 1: false - false
find II ul 1: false - false
find II ul 2: false - true
find II ul 2: false - false
find II ul 2: false - false
" ": li- > ul: ul2

, , , , "li" "ul"? jQuery , "find".

+3
2

closest() , .

$('#li22').closest('ul').length;

:

$.fn.context = function(context) {
  return !!$(this).closest(context).length;
};

console.log( $('#li22').context('kbd') ); // prints false
0

:

$("ul", "body").length; // how many UL are within the body?

, , :

$("body ul").length; // how many UL are within the body?

, :

$("ul").parents("body").length; // is a BODY up there?

"find" :

$("ul").find("li").length; // how many LI (included grandchildren) within UL?
+3

Source: https://habr.com/ru/post/1728334/

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