获取ID和值动态创建的元素jquery

Question

I need the id(and other attributes such as value) of a span i previously created on an ajax event. Is there a way to do this?

This is how the span is created on php post:

    echo "<span class='non-skin-symptom-choice disease_option' ".
        "onclick='showinfo(".$var[0].");' id=".$var[0].">"
        .$var[1]." -- ".number_format($var[3]*100, 2, '.', '')."%</span>";

and I want to get its id whenever a checkbox is clicked.

    $(".chb").click(function(){

        var id= $(this).attr('id');
        var list=[];

        $('.disease_option').each(function (){
            alert("this.val=="+ $(this).attr("val"));        //i need the value here
            var str= $(this).attr("value").split(" -- ")[1];
            alert(str);
            str=str.slice(0,str.length - 1);
            if(parseFloat(str) >=support)
                list.push(id)                                //i need the id here
        });

the checkbox is not dynamically created, so $(".chb").click(function(){} works.

somehow, $(this).attr("id") works but $(this).attr("val") returns undefined... i also tried $(this).attr("value") but same results. $(this).val returns empty.

Answer 1

use

$(document).on('click','.chb',function(){
  var id = $(".non-skin-symptom-choice").attr("id"); 
})

as this have a high level event attachment and it can get the elements who have been created on a runtime

Answer 2

尝试这个

alert($(".non-skin-symptom-choice").attr("id"));

Answer 3

The click() binding you're using is called a "direct" binding which will only attach the handler to elements that already exist. It won't get bound to elements created in the future. To do that, you'll have create a "delegated" binding by using on()

$(document).on('click','.chb',function(){
  var id = $(".non-skin-symptom-choice").attr("id"); 
})

possible duplicate: Click event doesn't work on dynamically generated elements

Answer 4

If your DOM node did not exist when the page loaded (ie. it was added to the page via AJAX after the page loaded), jQuery cannot see it if you try to update it or read it with jQuery methods. One way to overcome this is to set up your jQuery function to reference the class or ID of the parent of the node you want to target (assuming the parent class is loaded into the page on page load), along with the class of the node you want to target. For example:

$(".chb").click(function(){
    var id = $(".your-parent-class .non-skin-symptom-choice").attr("id");
    }
}