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populate textarea and file input from a dropdown -- Ajax and jQuery

Posted on 2010-08-26
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Last Modified: 2012-05-10
I need to query a mysql db for two fields: content_value and image_path, depending on the col_name  selected from a dropdown; then I need to populate a textarea and file input with the retrieved values.

Can anyone explain how to manage this using jQuery?
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Question by:Glen Gibb
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7 Comments
 
LVL 10

Expert Comment

by:mstrelan
ID: 33539166
It is not possible to populate a file input via javascript. This is a well documented security precaution.
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Author Comment

by:Glen Gibb
ID: 33539187
How about the textarea then?
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LVL 10

Expert Comment

by:mstrelan
ID: 33539212
Something like this ...
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script> 
<textarea id="myTextArea"></textarea>
<select id="myDropDown">
<option value="option_1">Option 1</option>
<option value="option_2">Option 2</option>
</select>
<script>
var myArray = {
  option_1: 'the content value goes here',
  option_2: 'some more content value goes here'
}

$(document).ready(function(){
  $('#myDropDown').change(function(){
    var selection_option = $(this).val();
    $('#myTextArea').val(myArray[selection_option]);
  });
});
</script>

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Author Comment

by:Glen Gibb
ID: 33539264
That's more what I needed.  My dropdown has the names of the different rows I'm searching for (col_name).  

The SQL needs to be something like:  "SELECT content_value FROM page_content WHERE col_name = (dropdown selected value)".

Where does the db query go in the whole process, and how do I get the data back in the textarea?
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Accepted Solution

by:
mstrelan earned 1500 total points
ID: 33539274
you can use php (or another backend language) to build up the myArray variable before the page load. this can become problematic if there are large amounts of text you need to store. alternatively you need to perform an ajax request. to learn about ajax requests follow this tutorial - http://www.talkphp.com/vbarticles.php?do=article&articleid=58&title=simple-ajax-with-jquery
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Author Comment

by:Glen Gibb
ID: 33543861
I appreciate the model.  However, the example shows how to POST.

How do I retrieve data from the php file:  return $row? echo $row?

Sorry to be so dense but I just don't see the big picture yet.
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Author Closing Comment

by:Glen Gibb
ID: 33544808
The link had the necessary info, along with your example.  Thanks.

(By the way, the result needs to be echoed on the php page.)
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