javascript - selecting specific element within one parent -


this html form structure:

edit: each section generated php script, , section id change depending on user input. not able use whole selector because of this

<section id="janedoe"> <div class="gcolumn1">jane doe</div> <div class="gcolumn2">color:     <input type="radio" name="chk_clr[]" id="chk_clr[]" value="y">yellow     <input type="radio" name="chk_clr[]" id="chk_clr[]" value="r">rose     <br>food:     <input type="radio" name="janedoe-chk_food[]" id="chk_food[]" value="y">yes     <input type="radio" name="janedoe-chk_food[]" id="chk_food[]" value="n">no</div> <div class="gcolumn3">     <select id="meal[]" disabled>         <option value=""></option>         <option value="chicken">chicken</option>         <option value="beef">beef</option>         <option value="vegetarian">vegetarian</option>         <option value="other">other</option>     </select> </div> <div style="clear: both; height: 5px;">&nbsp;</div> 

<section id="johnsmith">     <div class="gcolumn1">johnsmith</div>     <div class="gcolumn2">color:         <input type="radio" name="chk_clr[]" id="chk_clr[]" value="y">yellow         <input type="radio" name="chk_clr[]" id="chk_clr[]" value="r">rose         <br>food:         <input type="radio" name="johnsmith-chk_food[]" id="chk_food[]" value="y">yes         <input type="radio" name="johnsmith-chk_food[]" id="chk_food[]" value="n">no</div>     <div class="gcolumn3">         <select id="meal[]" disabled>             <option value=""></option>             <option value="chicken">chicken</option>             <option value="beef">beef</option>             <option value="vegetarian">vegetarian</option>             <option value="other">other</option>         </select>     </div>     <div style="clear: both; height: 5px;">&nbsp;</div> </section>

i'd dropdown meal[] enabled after chk_food[] selected yes. however, having trouble figuring out how tell jquery enable dropdown box within same section. have jquery: (i added alert boxes see part of code not working)

var update_meal = function () {       alert ("hi");       var sec_id = $(this).closest("section").attr("id");       alert (text(sec_id));       if ($(sec_id + "> #chk_food[]").is(":checked")) {           $(sec_id + "> #meal[]").prop('disabled', false);       } else {           $(sec_id + "> #meal[]").prop('disabled', 'disabled');       }    };   $(update_meal);   $("#chk_food[]").change(update_meal);

when tried run on jsfiddle, no bugs show up, coding doesn't work @ all. see alert box popping "hi" document loads

thank help

you can't have multiple elements on same page same id. invalid html , confuse code terribly. work, first need use classes find things:

<section>    <div class="gcolumn1">johnsmith</div>    <div class="gcolumn2">color:       <input type="radio" name="chk_clr[]" value="y">yellow       <input type="radio" name="chk_clr[]" value="r">rose       <br>food:       <input type="radio" name="johnsmith-chk_food[]" class="chk_food yes" value="y">yes       <input type="radio" name="johnsmith-chk_food[]" class="chk_food no" value="n">no    </div>    <div class="gcolumn3">       <select name="meal[]" class="meal" disabled>          <option value=""></option>          <option value="chicken">chicken</option>          <option value="beef">beef</option>          <option value="vegetarian">vegetarian</option>          <option value="other">other</option>       </select>    </div>    <div style="clear: both; height: 5px;">&nbsp;</div> </section>

then can start target things correctly. this:

$(".chk_food").on("change", function() {    $(this)       .closest("section")       .find("select.meal")       .prop("disabled", $(this).is(".no")); });

in case, bind change handler on both yes , no food radios. handler called 1 user clicks on, inherently turning 1 "on". find parent section, , meal select within it, , set disabled property true if .yes radio , false if .no radio.

i think should it.


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