https://nimss.org/themes/altant/js/plugins/bootstrap/bootstrap-file-input.js

1/*
2  Bootstrap - File Input
3  ======================
4
5  This is meant to convert all file input tags into a set of elements that displays consistently in all browsers.
6
7  Converts all
8  <input type="file">
9  into Bootstrap buttons
10  <a class="btn">Browse</a>
11
12*/
13(function($) {
14
15$.fn.bootstrapFileInput = function() {
16
17  this.each(function(i,elem){
18
19    var $elem = $(elem);
20
21    // Maybe some fields don't need to be standardized.
22    if (typeof $elem.attr('data-bfi-disabled') != 'undefined') {
23      return;
24    }
25
26    // Set the word to be displayed on the button
27    var buttonWord = 'Browse';
28
29    if (typeof $elem.attr('title') != 'undefined') {
30      buttonWord = $elem.attr('title');
31    }
32
33    var className = '';
34
35    if (!!$elem.attr('class')) {
36      className = ' ' + $elem.attr('class');
37    }
38
39    // Now we're going to wrap that input field with a Bootstrap button.
40    // The input will actually still be there, it will just be float above and transparent (done with the CSS).
41    $elem.wrap('<a class="file-input-wrapper btn btn-default ' + className + '"></a>').parent().prepend($('<span></span>').html(buttonWord));
42  })
43
44  // After we have found all of the file inputs let's apply a listener for tracking the mouse movement.
45  // This is important because the in order to give the illusion that this is a button in FF we actually need to move the button from the file input under the cursor. Ugh.
46  .promise().done( function(){
47
48    // As the cursor moves over our new Bootstrap button we need to adjust the position of the invisible file input Browse button to be under the cursor.
49    // This gives us the pointer cursor that FF denies us
50    $('.file-input-wrapper').mousemove(function(cursor) {
51
52      var input, wrapper,
53        wrapperX, wrapperY,
54        inputWidth, inputHeight,
55        cursorX, cursorY;
56
57      // This wrapper element (the button surround this file input)
58      wrapper = $(this);
59      // The invisible file input element
60      input = wrapper.find("input");
61      // The left-most position of the wrapper
62      wrapperX = wrapper.offset().left;
63      // The top-most position of the wrapper
64      wrapperY = wrapper.offset().top;
65      // The with of the browsers input field
66      inputWidth= input.width();
67      // The height of the browsers input field
68      inputHeight= input.height();
69      //The position of the cursor in the wrapper
70      cursorX = cursor.pageX;
71      cursorY = cursor.pageY;
72
73      //The positions we are to move the invisible file input
74      // The 20 at the end is an arbitrary number of pixels that we can shift the input such that cursor is not pointing at the end of the Browse button but somewhere nearer the middle
75      moveInputX = cursorX - wrapperX - inputWidth + 30;
76      // Slides the invisible input Browse button to be positioned middle under the cursor
77      moveInputY = cursorY- wrapperY - (inputHeight/2) + 10;
78
79      // Apply the positioning styles to actually move the invisible file input
80      /*
81      input.css({
82        left:moveInputX,
83        top:moveInputY
84      });*/
85    });
86
87    $('body').on('change', '.file-input-wrapper input[type=file]', function(){
88
89      var fileName;
90      fileName = $(this).val();
91
92      // Remove any previous file names
93      $(this).parent().next('.file-input-name').remove();
94      if (!!$(this).prop('files') && $(this).prop('files').length > 1) {
95        fileName = $(this)[0].files.length+' files';
96      }
97      else {
98        fileName = fileName.substring(fileName.lastIndexOf('\\') + 1, fileName.length);
99      }
100
101      // Don't try to show the name if there is none
102      if (!fileName) {
103        return;
104      }
105
106      var selectedFileNamePlacement = $(this).data('filename-placement');
107      if (selectedFileNamePlacement === 'inside') {
108        // Print the fileName inside
109        $(this).siblings('span').html(fileName);
110        $(this).attr('title', fileName);
111      } else {
112        // Print the fileName aside (right after the the button)
113        $(this).parent().after('<span class="file-input-name">'+fileName+'</span>');
114      }
115    });
116
117  });
118
119};
120
121// Add the styles before the first stylesheet
122// This ensures they can be easily overridden with developer styles
123var cssHtml = '<style>'+
124  '.file-input-wrapper { overflow: hidden; position: relative; cursor: pointer; z-index: 1; }'+
125  '.file-input-wrapper input[type=file], .file-input-wrapper input[type=file]:focus, .file-input-wrapper input[type=file]:hover { position: absolute; top: 0; left: 0; cursor: pointer; opacity: 0; filter: alpha(opacity=0); z-index: 99; outline: 0; }'+
126  '.file-input-name { margin-left: 8px; }'+
127  '</style>';
128$('link[rel=stylesheet]').eq(0).before(cssHtml);
129
130})(jQuery);