36 读取图像属性
1: <img src="/”image1.jpg"” name=”myImage”>2: <a href=”# ” onClick=”window.alert(document.myImage.width)”>Width</a>3:
37 动态加载图像
1: <script language=”JavaScript”>2: myImage = new Image;3: myImage.src = “Tellers1.jpg”;4: </script>
38 简单的图像替换
1: <script language=”JavaScript”>2: rollImage = new Image;3: rollImage.src = “rollImage1.jpg”;4: defaultImage = new Image;5: defaultImage.src = “image1.jpg”;6: </script>7: <a href="/”myUrl"” onMouseOver=”document.myImage.src = rollImage.src;”8: onMouseOut=”document.myImage.src = defaultImage.src;”>9: <img src="/”image1.jpg"” name=”myImage” width=100 height=100 border=0>
39 随机显示图像
1: <script language=”JavaScript”>2: var imageList = new Array;3: imageList[0] = “image1.jpg”;4: imageList[1] = “image2.jpg”;5: imageList[2] = “image3.jpg”;6: imageList[3] = “image4.jpg”;7: var imageChoice = Math.floor(Math.random() * imageList.length);8: document.write(‘<img src=”’ + imageList[imageChoice] + ‘“>’);9: </script>
40 函数实现的图像替换
1: <script language=”JavaScript”>2: var source = 0;3: var replacement = 1;4: function createRollOver(originalImage,replacementImage) { 5: var imageArray = new Array;6: imageArray[source] = new Image;7: imageArray[source].src = originalImage;8: imageArray[replacement] = new Image;9: imageArray[replacement].src = replacementImage;10: return imageArray;11: }12: var rollImage1 = createRollOver(“image1.jpg”,”rollImage1.jpg”);13: </script>14: <a href=”#” onMouseOver=”document.myImage1.src = rollImage1[replacement].src;”15: onMouseOut=”document.myImage1.src = rollImage1[source].src;”>16: <img src="/”image1.jpg"” width=100 name=”myImage1” border=0>17: </a>
41 创建幻灯片
1: <script language=”JavaScript”>2: var imageList = new Array;3: imageList[0] = new Image;4: imageList[0].src = “image1.jpg”;5: imageList[1] = new Image;6: imageList[1].src = “image2.jpg”;7: imageList[2] = new Image;8: imageList[2].src = “image3.jpg”;9: imageList[3] = new Image;10: imageList[3].src = “image4.jpg”;11: function slideShow(imageNumber) { 12: document.slideShow.src = imageList[imageNumber].src;13: imageNumber += 1;14: if (imageNumber < imageList.length) { 15: window.setTimeout(“slideShow(“ + imageNumber + “)”,3000);16: }17: }18: </script>19: </head>20: <body onLoad=”slideShow(0)”>21: <img src="/”image1.jpg"” width=100 name=”slideShow”>
42 随机广告图片
1: <script language=”JavaScript”>2: var imageList = new Array;3: imageList[0] = “image1.jpg”;4: imageList[1] = “image2.jpg”;5: imageList[2] = “image3.jpg”;6: imageList[3] = “image4.jpg”;7: var urlList = new Array;8: urlList[0] = “http://some.host/”;9: urlList[1] = “http://another.host/”;10: urlList[2] = “http://somewhere.else/”;11: urlList[3] = “http://right.here/”;12: var imageChoice = Math.floor(Math.random() * imageList.length);13: document.write(‘<a href=”’ + urlList[imageChoice] + ‘“><img src=”’ + imageList[imageChoice] + ‘“></a>’);14: </script>
JavaScript就这么回事4：表单
还是先继续写完JS就这么回事系列吧～43 表单构成
1: <form method=”post” action=”target.html” name=”thisForm”>2: <input type=”text” name=”myText”>3: <select name=”mySelect”>4: <option value=”1”>First Choice</option>5: <option value=”2”>Second Choice</option>6: </select>7: <br/>8: <input type=”submit” value=”Submit Me”>9: </form>
44 访问表单中的文本框内容
1: <form name=”myForm”>2: <input type=”text” name=”myText”>3: </form>4: <a href='#' onClick='window.alert(document.myForm.myText.value);'>Check Text Field</a>
45 动态复制文本框内容
1: <form name=”myForm”>2: Enter some Text: <input type=”text” name=”myText”><br/>3: Copy Text: <input type=”text” name=”copyText”>4: </form>5: <a href=”#” onClick=”document.myForm.copyText.value =6: document.myForm.myText.value;”>Copy Text Field</a>
46 侦测文本框的变化
1: <form name=”myForm”>2: Enter some Text: <input type=”text” name=”myText” onChange=”alert(this.value);”>3: </form>
47 访问选中的Select
1: <form name=”myForm”>2: <select name=”mySelect”>3: <option value=”First Choice”>1</option>4: <option value=”Second Choice”>2</option>5: <option value=”Third Choice”>3</option>6: </select>7: </form>8: <a href='#' onClick='alert(document.myForm.mySelect.value);'>Check Selection List</a>
48 动态增加Select项
1: <form name=”myForm”>2: <select name=”mySelect”>3: <option value=”First Choice”>1</option>4: <option value=”Second Choice”>2</option>5: </select>6: </form>7: <script language=”JavaScript”>8: document.myForm.mySelect.length++;9: document.myForm.mySelect.options[document.myForm.mySelect.length - 1].text = “3”;10: document.myForm.mySelect.options[document.myForm.mySelect.length - 1].value = “Third Choice”;11: </script>
49 验证表单字段
1: <script language=”JavaScript”>2: function checkField(field) { 3: if (field.value == “”) { 4: window.alert(“You must enter a value in the field”);5: field.focus();6: }7: }8: </script>9: <form name=”myForm” action=”target.html”>10: Text Field: <input type=”text” name=”myField”onBlur=”checkField(this)”>11: <br/><input type=”submit”>12: </form>
50 验证Select项
1: function checkList(selection) { 2: if (selection.length == 0) { 3: window.alert(“You must make a selection from the list.”);4: return false;5: }6: return true;7: }
