用jQuery选择所选元素的选项值

Question

I'm trying to use jquery to select the option value of the selected element in an html dropdown.

HTML

<select class="select1">
    <option value ="0">" + state.greens[0].name + "</option>
    <option value ="1">" + state.greens[1].name + "</option>
    <option value ="2">" + state.greens[2].name + "</option>
</select>

The option values represent an index position in an array that I can load to generate additional data about objects within them.

I'm trying to use jquery to grab the option value of whatever dropdown element is currently selected.

Right now I'm using this code but it's not working:

JQUERY

var a = $(".select1 option:selected");

However it's not bringing back "1", "2", "3", etc.

When I run console.log(a) I get the following:

Not sure what's happening.

The idea is that I can use the variable a to load data like state.greens[a].price, state.greens[a].ingredients, etc.

Answer 1

You are almost there. Just give:

var a = $(".select1 option:selected").attr("value");

Or give this:

var a = $(".select1").val();

You need to get the value of the <select> .

Answer 2

var a = $(".select1").val(); // is the simple solution

Answer 3

Try this..

HTML

<select class="select1" id="select1">
    <option value ="0">Option 1</option>
    <option value ="1">Option 2</option>
    <option value ="2">Option 3</option>
</select>

Pure Javascript solution

document.getElementById("select1").addEventListener("change", function(){
    var a = document.getElementById("select1").value;

   alert(a);
});

Check out this Fiddle

Snippet

 document.getElementById("select1").addEventListener("change", function(){ var a = document.getElementById("select1").value; alert(a); }); 

 <select class="select1" id="select1"> <option value ="0">Option 1</option> <option value ="1">Option 2</option> <option valuae ="2">Option 3</option> </select>