如果一个选择和另一个选择中的选择选项显示div元素

Question

I want to know how to show one element after I select option from one select and then select option from another select. If I have 2 selected options the div need to show, else to hide. I tried this, but it is not working. How can I do it with change function or something else ? Thanks.

if ($('select.one option').is(':selected') && $('select.two option').is(':selected')) {
    jQuery('.box').show();
 } else { 
         jQuery('.box').hide();
         }

Answer 1

Try this

$(document).on("change","select.one,select.two",function(){

     if ($('select.one option').is(':selected') && $('select.two option').is(':selected')) {
        jQuery('.box').show();
     } else { 
        jQuery('.box').hide();
     }
 });

Answer 2

You need to wrap your code in a "change" event listener.

There are several ways of doing it, but this should work fine.

$('select.one').change(function() {
    if ($('select.one option').is(':selected') && $('select.two option').is(':selected')) {
        $('.box').show();
     } else {
        $('.box').hide();
    }
});

Answer 3

Here you go with a solution https://jsfiddle.net/axaryfb2/

 $('select').change(function(){ if (($('select.one option').is(':selected') && $('select.one option:selected').val() != "") && ($('select.two option').is(':selected') && $('select.two option:selected').val() != "")) { $('.box').show(); } else { $('.box').hide(); } }); 

 .box{ width: 100px; height:100px; background: blue; display:none; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <select class="one"> <option value="">Select Option</option> <option value="test1">test 1</option> <option value="test2">test 2</option> </select> <select class="two"> <option value="">Select Option</option> <option value="testA">test A</option> <option value="testB">test B</option> </select> <div class="box"> </div> 

JS

$('select').change(function(){
   if ($('select.one option').is(':selected') && $('select.two option').is(':selected')) {
      $('.box').show();
   } else { 
      $('.box').hide();
   }
});

Hope this will help you.

Answer 4

Try this

Ive included a listener on all select elements on the page that have the class demoSelect .

You dont want to add a listener to all select elements on your page as you may have other select elements that dont require the same logic. Wrapping them in a class and then selecting on the class instead allows for this.

 //use the on() method to attach event handlers, this replaces the live(), delegate() and bind() methods from previous JQuery versions $(".demoSelect").on("change", function() { //if values for both dropdowns are set to "1" if( $("#one").val() == "1" && $("#two").val() == "1") { //show the div $(".box").show(); } else { //hide the div $(".box").hide(); } }); 

 .container { border: 1px solid black; height: 70px; } .padding { padding: 5px; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <!-- example of select options that are affected by the above javascript !--> <div class="container"> <div class="padding"> <span> This select group uses the script because of the '.demoSelect' class </span><br/> <select id="one" class="demoSelect"> <option> Please Select </option> <option> 1 </option> <option> 2 </option> </select> <select id="two" class="demoSelect"> <option> Please Select </option> <option> 1 </option> <option> 2 </option> </select> </div> <div class="box padding" hidden>test</div> </div><br/> <!-- example of select options that arent affected by the above javascript !--> <div class="container"> <div class="padding"> <span> This select group is unaffected by the script </span><br/> <select id="separateSelectOptionOne"> <option> Please Select </option> <option> 1 </option> <option> 2 </option> </select> <select id="separateSelectOptionTwo"> <option> Please Select </option> <option> 1 </option> <option> 2 </option> </select> </div> </div> 

More info on the on() method here