douchi8503
2014-11-19 14:35
浏览 98

AJAX / jQuery:根据数值改变DIV背景?

I am new with AJAX/jQuery and trying something new.

here is my fiddle for better understanding Each of those squares are DIVS.

<div class="desk_box_ver" id="desk_B20" data-rel="85" style="left:20px;top:1165px;">B20</div>

The number inside of is being retrieved with an AJAX call that GETs it with a PHP script executing a query, it will replace the "B20" for "1300" as an example.

Problem:

How can I produce a "heat map" based on the numbers being displayed. Example: Lets say the number range is from 100(the lowest) to 1800(the highest). Depending on the number range, a background color will have to be displayed from green-ish, to yellow-ish, orange-ish, and red.

A similar problem I found on stackoverflow is this one

AJAX:how I am displaying the numbers inside of the DIVs

<script type="text/javascript">
            $(document).ready(function() {
                $('#aht').click(function(){
                    $.ajax({
                    type:"GET",
                    url : "show_aht.php",
                    data:{  } , // do I need to pass data if im GET ting?
                    dataType: 'json',
                    success : function(data){
                        //going through all DIVs only once with this loop
                            for(var i = 0; i < data.length; i++) { // loop over results
                            var divForResult = $('#desk_' + data[i]['station']); // look for div for this object
                            if(divForResult.length) { // if a div was found

THIS IS WHERE I AM OUTPUTTING THE NUMBER

      divForResult.html(data[i]['aht_value']); // set inner HTML with AHT value


                            }//end if
                            }//end for
                      }//end success
                });//end ajax
              });//end click
            });//end rdy
        </script>

show_aht.php numbers being retrieved from the array below

$result = array();
    foreach ($memo as $username => $memodata) {
    if (in_array($username, array_keys($user))) {
    // Match username against the keys of $user (the usernames) 
    $userdata = $user[$username];
    //if AHT is null give N/A as value
    if (is_null($memodata['aht_value'])) {
        $result[] = array( 'username'  => $userdata['username'],
                                             'aht_value' => 'NA',
                                             'station'  => $userdata['station']
                                            );
    }//end inner if 
    //else give the actual value of AHT without the decimals
    else {
        $result[] = array( 'username'  => $userdata['username'],
                                             'aht_value' => substr($memodata['aht_value'],0,-3),
                                             'station'   => $userdata['station']
                                            );
    }//end else
    }//end outer if
    }//end for

echo json_encode($result);
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3条回答 默认 最新

  • dqqfuth6736 2014-11-19 14:58
    已采纳

    Have a play with this fiddle. It inserts a value and then applies a color to is (using a very simple algorithm that you will want to change). Here's how you could implement it in your code

    success : function(data){
      for(var i = 0; i < data.length; i++) { // loop over results
        var divForResult = $('#desk_' + data[i]['station']); // look for div for this object
        if(divForResult.length) { // if a div was found
           divForResult.html(data[i]['aht_value']).css("background-color", colorMe(data[i]['aht_value']));
        }//end if
      }//end for
    }//end success
    

    Make these available in your code:

    function colorMe(v){
        return "rgb(" + conv(v) + "," + (255-conv(v)) + ",0)";
    }
    
    function conv(x){
        return Math.floor((x - 100) / (1800-100) * 255);
    }
    
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  • douban5644 2014-11-19 15:16

    I'm not sure if I understood the problem completely, but here is the simplest possible idea to hopefully help you out: http://jsfiddle.net/Arministrator/0vhv37jf/

    $( document ).ready(function() {
    
        var valuediv = document.getElementById('valuediv');
        var valuedive = valuediv.innerHTML;
        $("#valuediv").css({"background-color":"#"+valuedive});
    });
    

    Whatever number is inside a div it will affect the color of the div. You can play with it if you want more than 3 digits, this is just an example to guide you. (For example #900 is red color)

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  • duanqiao9541 2014-11-19 16:25

    I wrote a generic function that takes a number and a range object as arguments, and calculates a color for the number based on its position in the range.

    /**
     * Calculate a color based on number's position in a range.
     * @param  {number} num  Number to calculate a color for
     * @param  {object} opts Range of colors and numbers in the following form:
     *                       {
     *                          start: {number: {number}, color: {rgb array: [r,g,b]}},
     *                          end:   {number: {number}, color: {rgb array: [r,g,b]}}
     *                       }
     *                       where each of "r", "g", "b" is a value from 0 to 255.
     *                       I.e. a range specifying numbers from 0 to 100 with colors from black to white: {start: {number: 0, color: [0,0,0]}, end: {number: 100, color: [255,255,255]}}
     * @return {string}      CSS color
     */
    function colorCode(num, opts) {
        var color = [];
    
        if(num <= opts.start.number)
            color = opts.start.color;
        else if(num >= opts.end.number)
            color = opts.end.color;
        else {
            for(var i = 0; i < 3; i++) {
                color[i] = Math.round( (num - opts.start.number) / (opts.end.number - opts.start.number) * (opts.end.color[i] - opts.start.color[i]) + opts.start.color[i] );
            }
        }
    
        return 'rgb(' + color.join() + ')';
    }
    

    See fiddle

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