javascript - Disable Dropdownlist based on Radio Button -


goal:
if select "dates", can select dropdownlist start date , end date. if select "all ... only" start , end date grey colored in background , cannot click on arrow down. these dropdownlists disable.

problem:
don't know how create in frontend code.

info:
*the dropdownlists created in asp.net mvc 4

*i'm using jquery 1.10 , bootstrap

enter image description here

        <input id="aa" type="radio" name="searchselection" value="all" style="display: inline-block;" checked>         <label for="aa" style="width: 100px; display: inline-block; ">all ...only</label>           <input id="dates" type="radio" name="searchselection" value="dates" style="display: inline-block;">         <label for="dates" style="width: 100px; display: inline-block;">dates</label>           @{         datetime mydate = datetime.today;          list<selectlistitem> mylistselectlistitem_yearstartdate = new list<selectlistitem>();          (int = 0; < 10; i++)         {         mylistselectlistitem_yearstartdate.add(new selectlistitem { text = (mydate.year - i).tostring(), value = (i + 1).tostring(), selected = datetime.today.year == (mydate.year - i) ? true : false });         }         }          @html.dropdownlist("yearstartdate", mylistselectlistitem_yearstartdate)

this fixed in following jsfiddle

i've stripped out of unneeded html attributes (such style tags - styles better applied in css) , stubbed out end code generating <select> in order simplify example , focus on solution.

let's @ what's happened:

<select class='js-date-selector' disabled='disabled'>

firstly, each of select elements has been edited add following 2 attributes. class allows targeting javascript (or jquery) - note js- prefix not essential, it's nice way of keeping javascript class attributes separate others. also, class used instead of id, best easier re-use, have in example.

the disabled attribute how mark-up html element it's greyed out. if you're going mark 'all dates' checked on page load , 'all dates' being checked means selects should disabled, html needs mark selects disabled on load.

next bit toggling:

$('.js-all-or-dates').on('click',function() {     var justclicked = $(this),         dateselectors = $('.js-date-selector');      if (justclicked.attr('id') === 'aa') {         dateselectors.attr('disabled', true);     }     else {         dateselectors.attr('disabled', false);     }     });

firstly, bind function click event each of our .js-all-or-dates radio inputs.

secondly, assign variables, using justclicked = $(this) store jquery version element clicked , dateselectors store of our select items, using class mentioned above

finally, @ clicked , if has id of 'all dates' radio input set disabled property on select elements.

also, practice , smoother development: === used equality; $ function calls minimised assigning results local variables; , var statement contains comma separated declarations.


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