var form = document.getElementById("myform"); form.addEventListener("submit", function(event) { var event = event || window.event; var target = event.target; var btn = target.elements["submit-btn"]; btn.disabled = true; }, false);
以上代码为表单的submit事件添加了一个事件处理程序. 事件触发后, 代码取得了提交按钮, 并将其disabled属性设置为true. 注意, 不能通过onclick事件处理程序来实现这个功能. 原因是因不同浏览器之间存在”时差”: 有的浏览器会在触发表单的submit事件之前触发click事件.
var textbox = document.forms[0].elements[0]; textbox.addEventListener("focus", function(event) { var event = event || window.event, target = event.target; if (target.style.backgroundColor != "red") { target.style.backgroundColor = "yellow"; } }, false); textbox.addEventListener("blur", function(event) { var event = event || window.event, target = event.target; if (/[^\d]/.test(target.value)) { target.style.backgroundColor = "red"; } else { target.style.backgroundColor = ""; } }, false); textbox.addEventListener("change", function(event) { var event = event || window.event, target = event.target; console.log(123) if (/[^\d]/.test(target.value)) { target.style.backgroundColor = "red"; } else { target.style.backgroundColor = ""; } }, false)
function getSelectedText(textbox) { if (typeof textbox.selectionStart == "number") { return textbox.value.substring(textbox.selectionStart, textbox.sectionEnd); } else if (document.selection) {//兼容IE return document.selection.createRange().text; } }
function selecText(textbox, startIndex, stopIndex) { if (textbox.setSelectionRange) { textbox.setSelectionRange(startIndex, stopIndex); } else if (textbox.createTextRange) {//兼容IE8及更早版本 var range = textbox.createTextRange(); range.collapse(true); range.moveStart("character", startIndex); range.moveEnd("character", stopIndex - startIndex); range.select(); textbox.focus(); } }
测试1:
textbox.addEventListener("focus", function(event) { var event = event || window.event, target = event.target; if (target.style.backgroundColor != "red") { target.style.backgroundColor = "yellow"; } selecText(textbox, 0, 1); }, false);
效果:
测试2:
selecText(textbox, 0, 5);
getClipboardText: function(event) { //获得剪切板内容 var clipboardData = (event.clipboardData || window.clipboardData); return clipboardData.getData("text"); } setClipboardText: function(event, value) { //设置剪切版内容 if (event.clipboardData) { return event.clipboardData.setData("text/plain", value); } else if (window.clipboardData) { return window.clipboardData.setData("text", value); } }
注意: Firefox, Safari, Chrome只允许在onpaste事件处理程序中访问getData( )方法. (测试2017/9/1: 在copy事件下获取返回空字符串)
用途:
在paste事件中, 可以确定剪切板的值是否有效, 如果无效, 就可以像下面示例中那样, 取消默认的行为.
textbox.addEventListener("paste", function(event) { var event = event || window.event; text = getClipboardText(event); if (!/^\d*$/.test(text)) { event.preventDefault(); } }, false)
效果:
//HTML <form method="post" id="myform"> <input type="text" name="tel1" id="textTel1" maxlength="3"> <input type="text" name="tel2" id="textTel2" maxlength="3"> <input type="text" name="tel3" id="textTel3" maxlength="4"> </form>
//Js (function() { function tabForward(event) { var event = event || window.event; target = event.target; if (target.value.length == target.maxLength) { var form = target.form; for (var i = 0, len = form.elements.length; i < len; i++) { if (form.elements[i] == target) { if (form.elements[i + 1]) { form.elements[i + 1].focus(); } } } } } var textbox1 = document.getElementById("textTel1"); var textbox2 = document.getElementById("textTel2"); var textbox3 = document.getElementById("textTel3"); textbox1.addEventListener("keyup", tabForward); textbox2.addEventListener("keyup", tabForward); textbox3.addEventListener("keyup", tabForward);})();
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