jQuery Selected

Im trying to see if a special option in a select-menu has a value equal to 1, and then hide another object. Ive been trying all day but cant figure it out (probably because im a total beginner at jquery)

I have a select-menu that i populated from a db. If the option with the id="1" have "selected=selected" then i want another div to hide when the page is loaded.

This is what i got so far:

<select>
<option id="3">test1</option>
<option id="1" selected="selected">test2</option>
<option id="2">test3</option>
</select>
<div id="hide">Hide me</div>


$("#1 option:selected").ready(function () {
   $("#hide").hide();
});
开发者_开发百科

Any help would be greatly appreciated. Thanks.. /Andreas

There are a few things wrong with your code I'm afraid:

1. You're using the event on the wrong object - .ready() should be applied to the document
2. IDs can't start with a number
3. You should be using the value attribute instead of the id attribute.
4. You're better off using .val() to get the value
5. You should give the select an id in case you add another one to the page.

Putting it all together:

<select id="foo">
<option value="3">test1</option>
<option value="1" selected="selected">test2</option>
<option value="2">test3</option>
</select>
<div id="hide">Hide me</div>


$(document).ready(function () {
   if ($('#foo').val() != 1)
       $("#hide").hide();
});

If you want to do this dynamically when the select is changed, you can do it like this:

$('#foo').change(function () {
   if ($(this).val() != 1)
       $("#hide").hide();
   else
       $("#hide").show();
});

First of all your id is not valid one. It should not start with a number. Provide an id to the select element and find the selected element and check its value to 1 and show/hide the appropriate div.

// assume your select has id="mySelect"
$(function() {
    $('#mySelect').change(function() {
        var value = $(this).val();
        if (value == '1') {
            $('#hide').hide();
        } else {
            $('#hide').show();
        }
        return false;
    });
});

$(function() {

$('select').change(function(){
  if ($("option:selected",this).attr('id') == 1 ){
   $("#hide").hide();
  }
});

});

Will work with what you have, but ditto the points raised by others -

• HTML spec states that you should not have ids starting with numbers
• Use the value attribute for options instead of an id
• You need to put the code in a function that will execute when the change event of the <select> is raised
• Give the <select> an id to uniquely identify it.