jquery - Getting the src of an img tag on radio select -

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i have html code follows:

<div id="input-option227">     <div class="radio">         <label>             <input type="radio" name="option[227]" value="17" />             <img src="http://localhost/upload/image/cache/catalog/demo/canon_eos_5d_1-50x50.jpg" alt="black" class="img-thumbnail" />             black         </label>     </div>     <div class="radio">         <label>             <input type="radio" name="option[227]" value="18" />             <img src="http://localhost/upload/image/cache/catalog/demo/apple_logo-50x50.jpg" alt="green" class="img-thumbnail" />             green         </label>     </div> </div>

i want img src when select radio button means when radio value 17 want alert:

http://localhost/upload/image/cache/catalog/demo/canon_eos_5d_1-50x50.jpg

and when value 18 alert should be:

http://localhost/upload/image/cache/catalog/demo/apple_logo-50x50.jpg

what have done far is:

$(document).ready(function() {     $('input:radio[name="option[227]"]').change(function() {         if ($(this).val() == '17') {             alert('type a');         }         if ($(this).val() == '18') {             alert('type b');         }     }); });

what should ?

please have @ code snippet. used $.closest , $.find locate img tag associated radio button.

$(document).ready(function(){      $('input:radio').change(function() {          var closestlable = $(this).closest("label");          var imgtag =  closestlable.find("img.img-thumbnail");          var src = imgtag.attr("src");          alert(src);      });  });
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.0/jquery.min.js"></script>  <div id="input-option227">                                  <div class="radio">                    <label>                      <input type="radio" name="option[227]" value="17" />                      <img src="http://localhost/upload/image/cache/catalog/demo/canon_eos_5d_1-50x50.jpg" alt="black" class="img-thumbnail" /> black                                      </label>                  </div>                                  <div class="radio">                    <label>                      <input type="radio" name="option[227]" value="18" />                      <img src="http://localhost/upload/image/cache/catalog/demo/apple_logo-50x50.jpg" alt="green" class="img-thumbnail" /> green                                      </label>                  </div>                                </div>              </div>


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