JQuery loop through DIV’s to hide /show

jquery

I have a combo box with choice 0 – 8 and 8 sets of input fields where each set of input fields are wrapped around a div with the same class.

I need to find out how to use Jquery to hide/unhide the divs based on the selected combobox value.
For example, if I select 2, then class="member1" and class="member2" needs to be visible, the rest are invisible. If i change my mind , and select 1, then class="member1" stay visible but member2 and the rest are set to invisible?

<div class="member1"> 
<input id="name1">
<input id="age1">
</div>
<div class="member2"> 
<input id="name2">
<input id="age2">
</div>
:
:
<div class="member8"> 
<input id="name8">
<input id="age8">
</div>

Best Answer

It is rather simple. Considering selected_number is already an integer extracted from the select field you were talking about, the code could look like this:

jQuery(function(){
    var selected_number = 2;
    jQuery('.member1, .member2, .member3, .member4, .member5, .member6, .member7, .member8').hide();
    for (var i=1; i<=selected_number;i++){
        jQuery('.member'+i).show();
    }
});

As a proof see this jsfiddle (change selected_number value to see how it works).

Related Solutions

Javascript – n “exists” function for jQuery

In JavaScript, everything is 'truthy' or 'falsy', and for numbers 0 means false, everything else true. So you could write:

if ($(selector).length)

You don't need that >0 part.

Javascript – Add table row in jQuery

The approach you suggest is not guaranteed to give you the result you're looking for - what if you had a tbody for example:

<table id="myTable">
  <tbody>
    <tr>...</tr>
    <tr>...</tr>
  </tbody>
</table>

You would end up with the following:

<table id="myTable">
  <tbody>
    <tr>...</tr>
    <tr>...</tr>
  </tbody>
  <tr>...</tr>
</table>

I would therefore recommend this approach instead:

$('#myTable tr:last').after('<tr>...</tr><tr>...</tr>');

You can include anything within the after() method as long as it's valid HTML, including multiple rows as per the example above.

Update: Revisiting this answer following recent activity with this question. eyelidlessness makes a good comment that there will always be a tbody in the DOM; this is true, but only if there is at least one row. If you have no rows, there will be no tbody unless you have specified one yourself.

DaRKoN_ suggests appending to the tbody rather than adding content after the last tr. This gets around the issue of having no rows, but still isn't bulletproof as you could theoretically have multiple tbody elements and the row would get added to each of them.

Weighing everything up, I'm not sure there is a single one-line solution that accounts for every single possible scenario. You will need to make sure the jQuery code tallies with your markup.

I think the safest solution is probably to ensure your table always includes at least one tbody in your markup, even if it has no rows. On this basis, you can use the following which will work however many rows you have (and also account for multiple tbody elements):

$('#myTable > tbody:last-child').append('<tr>...</tr><tr>...</tr>');

Best Answer

Related Solutions

Javascript – n “exists” function for jQuery

Javascript – Add table row in jQuery

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