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How do I insert li into ul based on an attribute?

Posted on 2010-08-25
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Last Modified: 2012-05-10
Hi,
I have a <ul> like below and i need to insert a <li> based on msg-time attribute.
If msg-time=250, i need to insert it between msg-time 200 and 300

Need to insert
 <li  msg-time="250" class="msg-item"></li>

into
<ul id="msg-list">  
        <li  msg-time="100" class="msg-item"></li>
        <li  msg-time="200" class="msg-item"></li>
        <li  msg-time="300" class="msg-item"></li>  
        <li  msg-time="400" class="msg-item"></li>  
        <li  msg-time="500" class="msg-item"></li>  
</ul>

What is the best way? I may have many <li>, so I need to be efficient.

Thanks
Jamie
0
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Question by:jamie_lynn
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5 Comments
 
LVL 3

Expert Comment

by:johnsy32
ID: 33521106
You could select the list item with the msg-time attribute of 200, and then append the new element after..

$('[msg-time=200]').after('<li msg-time="250" class="msg-item"></li>');
0
 

Author Comment

by:jamie_lynn
ID: 33524195
Hi johnsy,

I don't know what the msg-time values in the <li> before hand. I can't hardcode the values

Thanks
Jamie
0
 
LVL 3

Expert Comment

by:johnsy32
ID: 33524373
Hi

You could loop through each li item, and then test the msg-time attribute on each element...

$('#msg-list li').each(function() {
                  
if ($(this).attr('msg-time') == 200) {
      $(this).after('<li msg-time="250" class="msg-item"></li>');
}
                                                            
});

I'm not completely sure what you are trying to do. How is the list being built?
0
 
LVL 3

Accepted Solution

by:
johnsy32 earned 500 total points
ID: 33524515
Hey

If you mean that the 250 could be a variable and could change, and depending on what the value is, put it between the closest two numbers, you could do something like this.

put the msg_time into a variable
set the element to be added to the list
loop through the list
get the msg_time of the current list item
get the msg_time of the next list item
then test to see if msgtime is between these 2 numbers, if it is, add the new element

            msg_time = 250;
            new_list_element = ' <li msg-time="' + msg_time + '" class="msg-item">new</li> ';
            
            $('#msg-list li').each(function() {
                  
                  minimum = $(this).attr('msg-time');
                  maximum = $(this).next().attr('msg-time');
            
            
                  if(msg_time >= minimum && msg_time <= maximum) {
                      $(this).after(new_list_element);
                  }

                                                            
              });
0
 

Author Comment

by:jamie_lynn
ID: 33524557
That works great! Thanks!
0

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