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1 // minmax.js: make IE5+/Win support CSS min/max-width/height
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2 // version 1.0, 08-Aug-2003
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3 // written by Andrew Clover <and@doxdesk.com>, use freely
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4
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5 /*@cc_on
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6 @if (@_win32 && @_jscript_version>4)
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7
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8 var minmax_elements;
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9
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10 minmax_props= new Array(
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11 new Array('min-width', 'minWidth'),
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12 new Array('max-width', 'maxWidth'),
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13 new Array('min-height','minHeight'),
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14 new Array('max-height','maxHeight')
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15 );
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16
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17 // Binding. Called on all new elements. If <body>, initialise; check all
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18 // elements for minmax properties
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19
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20 function minmax_bind(el) {
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21 var i, em, ms;
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22 var st= el.style, cs= el.currentStyle;
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23
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24 if (minmax_elements==window.undefined) {
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25 // initialise when body element has turned up, but only on IE
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26 if (!document.body || !document.body.currentStyle) return;
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27 minmax_elements= new Array();
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28 window.attachEvent('onresize', minmax_delayout);
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29 // make font size listener
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30 em= document.createElement('div');
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31 em.setAttribute('id', 'minmax_em');
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32 em.style.position= 'absolute'; em.style.visibility= 'hidden';
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33 em.style.fontSize= 'xx-large'; em.style.height= '5em';
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34 em.style.top='-5em'; em.style.left= '0';
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35 if (em.style.setExpression) {
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36 em.style.setExpression('width', 'minmax_checkFont()');
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37 document.body.insertBefore(em, document.body.firstChild);
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38 }
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39 }
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40
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41 // transform hyphenated properties the browser has not caught to camelCase
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42 for (i= minmax_props.length; i-->0;)
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43 if (cs[minmax_props[i][0]])
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44 st[minmax_props[i][1]]= cs[minmax_props[i][0]];
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45 // add element with properties to list, store optimal size values
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46 for (i= minmax_props.length; i-->0;) {
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47 ms= cs[minmax_props[i][1]];
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48 if (ms && ms!='auto' && ms!='none' && ms!='0' && ms!='') {
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49 st.minmaxWidth= cs.width; st.minmaxHeight= cs.height;
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50 minmax_elements[minmax_elements.length]= el;
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51 // will need a layout later
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52 minmax_delayout();
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53 break;
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54 } }
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55 }
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56
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57 // check for font size changes
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58
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59 var minmax_fontsize= 0;
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60 function minmax_checkFont() {
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61 var fs= document.getElementById('minmax_em').offsetHeight;
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62 if (minmax_fontsize!=fs && minmax_fontsize!=0)
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63 minmax_delayout();
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64 minmax_fontsize= fs;
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65 return '5em';
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66 }
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67
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68 // Layout. Called after window and font size-change. Go through elements we
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69 // picked out earlier and set their size to the minimum, maximum and optimum,
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70 // choosing whichever is appropriate
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71
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72 function minmax_delayout() {
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73 minmax_layout();
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74 }
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75
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76 function minmax_layout() {
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77 var i, el, st, cs, optimal, inrange;
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78 for (i= minmax_elements.length; i-->0;) {
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79 el= minmax_elements[i]; st= el.style; cs= el.currentStyle;
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80
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81 // horizontal size bounding
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82 st.width= st.minmaxWidth; optimal= el.offsetWidth;
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83 inrange= true;
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84 if (inrange && cs.minWidth && cs.minWidth!='0' && cs.minWidth!='auto' && cs.minWidth!='') {
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85 st.width= cs.minWidth;
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86 inrange= (el.offsetWidth<optimal);
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87 }
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88 if (inrange && cs.maxWidth && cs.maxWidth!='none' && cs.maxWidth!='auto' && cs.maxWidth!='') {
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89 st.width= cs.maxWidth;
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90 inrange= (el.offsetWidth>optimal);
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91 }
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92 if (inrange) st.width= st.minmaxWidth;
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93
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94 // vertical size bounding
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95 st.height= st.minmaxHeight; optimal= el.offsetHeight;
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96 inrange= true;
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97 if (inrange && cs.minHeight && cs.minHeight!='0' && cs.minHeight!='auto' && cs.minHeight!='') {
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98 st.height= cs.minHeight;
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99 inrange= (el.offsetHeight<optimal);
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100 }
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101 if (inrange && cs.maxHeight && cs.maxHeight!='none' && cs.maxHeight!='auto' && cs.maxHeight!='') {
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102 st.height= cs.maxHeight;
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103 inrange= (el.offsetHeight>optimal);
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104 }
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105 if (inrange) st.height= st.minmaxHeight;
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106 }
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107 }
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108
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109 // Scanning. Check document every so often until it has finished loading. Do
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110 // nothing until <body> arrives, then call main init. Pass any new elements
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111 // found on each scan to be bound
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112
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113 var minmax_SCANDELAY= 500;
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114
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115 function minmax_scan() {
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116 var el;
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117 for (var i= 0; i<document.all.length; i++) {
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118 el= document.all[i];
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119 if (!el.minmax_bound) {
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120 el.minmax_bound= true;
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121 minmax_bind(el);
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122 } }
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123 }
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124
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125 var minmax_scanner;
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126 function minmax_stop() {
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127 window.clearInterval(minmax_scanner);
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128 minmax_scan();
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129 }
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130
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131 minmax_scan();
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132 minmax_scanner=window.setInterval(minmax_scan, minmax_SCANDELAY);
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133 window.attachEvent('onload', minmax_stop);
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134
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135 @end @*/
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