[jQuery学习系列五 ]5-Jquery学习五-表单验证

<form action="" method="post" id ="myform"> ????<p id="error">姓名不能为空！</p> ???<table> ????????<tr> ????????<td><label for="name">姓名：</label></td> ????????????<td><input type ="text" id = "name"></td> ????????</tr> ?????????<tr> ????????????<td><input type ="submit" value="提交"></td> ????????</tr> ????</table></form>$(document).ready(function () { ???$("#error").hide(); //隐藏报错信息 ???$("#myform").submit(function () {//提交按钮点击 ???????var data = $("#name").val(); ???????var len = data.length; ???????if (len < 1) { ???????????$("#error").show(); //显示错误提示文本 ???????????return false; ???????} else { ???????????$("#error").hide(); ???????????return true; ???????} ???}); ???????$("#name").focus(function(event) { ???????$("p").hide(); ???});});

<form action="" method="post" id ="myform"> ????<p id="error">请输入数字！</p> ???<table> ????????<tr> ????????<td><label for="age">年龄：</label></td> ????????????<td><input type ="text" id = "age"></td> ????????</tr> ?????????<tr> ????????????<td><input type ="submit" value="提交"></td> ????????</tr> ????</table></form>//方式一：利用键盘事件和鼠标事件限定只能输入数字//只能输入数字，不包含小数点<div class="line">红包个数：<input type="text" name="packetNumber" value="5" onkeyup="this.value=this.value.replace(/\D/g,‘‘)" onafterpaste="this.value=this.value.replace(/\D/g,‘‘)" maxlength="10">个</div>//可以输入数字和小数点<div class="line">总&ensp;金&ensp;额：<input type="text" name="money" value="5" onkeyup="if(isNaN(value))execCommand(‘undo‘)" onafterpaste="if(isNaN(value))execCommand(‘undo‘)" maxlength="10">元</div>//方式二：利用isNaN函数$(document).ready(function () { ???$("#error").hide(); //隐藏报错信息 ???$("#myform").submit(function () {//提交按钮点击 ???????var data = $("#name").val(); ???????if (isNaN(data)) { ???????????$("#error").show(); //显示错误提示文本 ???????????event.preventDefault(); //取消事件的默认动作。阻止提交 ???????} else { ???????????$("#error").hide(); ???????} ???????});});

<form name="form1" method="post" action=""> ???<input type="checkbox" id="all" name="all"> ???<input type="button" id="btn1" value="全选"> ???<input type="button" id="btn2" value="取消全选"> ???<input type="button" id="btn3" value="选中所有奇数"> ???<input type="button" id="btn4" value="反选"> ???<input type="button" id="btn5" value="获得选中的所有值"> ???<br /> ???<input type="checkbox" name="checkbox" value="checkbox1">checkbox1 ???<input type="checkbox" name="checkbox" value="checkbox2">checkbox2 ???<input type="checkbox" name="checkbox" value="checkbox3">checkbox3 ???<input type="checkbox" name="checkbox" value="checkbox4">checkbox4 ???<input type="checkbox" name="checkbox" value="checkbox5">checkbox5 ???<input type="checkbox" name="checkbox" value="checkbox6">checkbox6 ???<input type="checkbox" name="checkbox" value="checkbox7">checkbox7 ???<input type="checkbox" name="checkbox" value="checkbox8">checkbox8</form>$("document").ready(function(){ $("#all").click(function(){ ????if(this.checked){ ?????$("input[name=‘checkbox‘]").each(function(){this.checked=true;}); ??$("#btn1").attr("value","反选"); ????}else{ ?????$("input[name=‘checkbox‘]").each(function(){this.checked=false;}); ?????$("#btn1").attr("value","全选"); ??} ??});$("#btn1").click(function(){ ?$("[name=‘checkbox‘]").attr("checked",‘true‘);//全选});$("#btn2").click(function(){ ?$("[name=‘checkbox‘]").removeAttr("checked");//取消全选});$("#btn3").click(function(){ ?$("[name=‘checkbox‘]:even").attr("checked",‘true‘);//选中所有奇数});$("#btn4").click(function(){ ?$("[name=‘checkbox‘]").each(function(){ ??if($(this).attr("checked")) ??{ ???$(this).removeAttr("checked"); ??}else{ ???$(this).attr("checked",‘true‘); ??} ?});});$("#btn5").click(function(){ ?var str=""; ?//$("input:checkbox[name=‘checkbox‘]:checked").each(function(){//可以 ?$("[name=‘checkbox‘][checked]").each(function(){ ??str+=$(this).val()+"\r\n"; ?}); ?alert(str); });});