测试集输入输出框的自适应高度

app/views/users/_user_programing_attr.html.erb

@@ -11,7 +11,7 @@
       <% homework.homework_tests.each_with_index do |test, index| %>
           <div class="mt10">
             <textarea class="InputBox  W320 fl mr10" placeholder="测试输入" id="textarea_input_test"><%= test.input %></textarea>
-            <textarea class="InputBox  W320  fl mr5" placeholder="测试输出"><%= test.output %></textarea>
+            <textarea class="InputBox  W320  fl mr5" placeholder="测试输出"  id="textarea_output_test"><%= test.output %></textarea>
             <a href="javascript:void(0);" class=" fl icon_add" title="增加测试组"></a>
             <% if index != 0 %>
                 <a href="javascript:void(0);" class=" fl icon_remove" title="删除测试组"></a>
@@ -22,7 +22,7 @@
   <% else %>
       <div class="mt10">
         <textarea class="InputBox  W320 fl mr10" placeholder="测试输入" id="textarea_input_test"></textarea>
-        <textarea class="InputBox  W320  fl mr5" placeholder="测试输出"></textarea>
+        <textarea class="InputBox  W320  fl mr5" placeholder="测试输出" id="textarea_output_test"></textarea>
         <a href="javascript:void(0);" class=" fl icon_add" title="增加测试组"></a>
         <div class="cl"></div>
       </div>
@@ -34,4 +34,11 @@
     <div class="cl"></div>
   </div>
 
-</div><!----HomeWorkCon end-->
+</div><!----HomeWorkCon end-->
+
+<script>
+    var text = document.getElementById("textarea_input_test");
+    var text2 = document.getElementById("textarea_output_test");
+    autoTextarea2(text,text2);
+    autoTextarea2(text2,text);
+</script>

public/javascripts/homework.js

@@ -168,7 +168,14 @@ $(function(){
     $("#BluePopupBox").on('click', 'a.icon_add', function(){
         var html = bt('t:test-answer-list', null);
         $(this).parent('.mt10').after(html);
-
+        var inputs = document.getElementsByName("program[input][]");
+        var outputs = document.getElementsByName("program[output][]");
+        if (inputs.length == outputs.length) {
+            for (var i=0; i<inputs.length; i++) {
+                autoTextarea2(inputs[i], outputs[i]);
+                autoTextarea2(outputs[i], inputs[i]);
+            }
+        }
     });
     $("#BluePopupBox").on('click', 'a.icon_remove', function(){
         $(this).parent('.mt10').remove();

public/javascripts/new_user.js

@@ -314,4 +314,93 @@ function clickOK(path)
         }
     });
 }
-/////////////////////////////////////////////////////////////////////////////////////////
+/////////////////////////////////////////////////////////////////////////////////////////
+
+var autoTextarea2 = function (elem,elem2, extra, maxHeight) {
+    extra = extra || 0;
+    var isFirefox = !!document.getBoxObjectFor || 'mozInnerScreenX' in window,
+        isOpera = !!window.opera && !!window.opera.toString().indexOf('Opera'),
+        addEvent = function (element, type, callback) {
+            element.addEventListener ?
+                element.addEventListener(type, callback, false) :
+                element.attachEvent('on' + type, callback);
+        },
+        getFirstStyle = elem.currentStyle ? function (name) {
+            var val = elem.currentStyle[name];
+
+            if (name === 'height' && val.search(/px/i) !== 1) {
+                var rect = elem.getBoundingClientRect();
+                return rect.bottom - rect.top -
+                    parseFloat(getFirstStyle('paddingTop')) -
+                    parseFloat(getFirstStyle('paddingBottom')) + 'px';
+            };
+
+            return val;
+        } : function (name) {
+            return getComputedStyle(elem, null)[name];
+        },
+        minHeight = parseFloat(getFirstStyle('height'))
+
+    elem.style.resize = 'none';
+    elem2.style.resize = 'none';
+    var change = function () {
+        var scrollTop, height,
+            padding = 0,
+            style = elem.style,
+            style2 = elem2.style;
+
+
+        if (elem._length === elem.value.length) return;
+        elem._length = elem.value.length;
+        elem2._length = elem._length;
+        if (!isFirefox && !isOpera) {
+            padding = parseInt(getFirstStyle('paddingTop')) + parseInt(getFirstStyle('paddingBottom'));
+        };
+        scrollTop = document.body.scrollTop || document.documentElement.scrollTop;
+
+        elem.style.height = minHeight + 'px';
+        elem2.style.height = minHeight + 'px';
+        if (elem.scrollHeight > minHeight) {
+            if (maxHeight && elem.scrollHeight > maxHeight) {
+                height = maxHeight - padding;
+                style.overflowY = 'auto';
+                style2.overflowY = 'auto';
+            } else {
+                height = elem.scrollHeight - padding;
+                style.overflowY = 'hidden';
+                style2.overflowY = 'hidden';
+            };
+            style.height = height + extra + 'px';
+            style2.height = height + extra + 'px';
+            scrollTop += parseInt(style.height) - elem.currHeight;
+            document.body.scrollTop = scrollTop;
+            document.documentElement.scrollTop = scrollTop;
+            elem.currHeight = parseInt(style.height);
+        };
+        if (elem2.scrollHeight > minHeight) {
+            if (maxHeight && elem2.scrollHeight > maxHeight) {
+                height = maxHeight - padding;
+                style.overflowY = 'auto';
+                style2.overflowY = 'auto';
+            } else {
+                height = elem2.scrollHeight - padding;
+                style.overflowY = 'hidden';
+                style2.overflowY = 'hidden';
+            };
+            style.height = height + extra + 'px';
+            style2.height = height + extra + 'px';
+            scrollTop += parseInt(style2.height) - elem2.currHeight;
+            document.body.scrollTop = scrollTop;
+            document.documentElement.scrollTop = scrollTop;
+            elem2.currHeight = parseInt(style2.height);
+        };
+    };
+
+    addEvent(elem, 'propertychange', change);
+    addEvent(elem, 'input', change);
+    addEvent(elem, 'focus', change);
+    addEvent(elem2, 'propertychange', change);
+    addEvent(elem2, 'input', change);
+    addEvent(elem2, 'focus', change);
+    change();
+};