在许多表单应用,我们经常遇到点击一个复选框(或下拉框)会引发旁边的复选框(或下拉框)发生改变,这种联动效果用avalon来做是非常简单的。在avalon里,存在各种绑定回调与$watch回调,完全满足你的需求。
下面是avalon所有绑定回调。
在表单联动效果中,我们最常用的是data-duplex-change。事不宜迟,我们先来一个全选非全选例子吧。
<!DOCTYPE html> <html> <head> <title>TODO supply a title</title> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width"> <script src="avalon.js"></script> <script> var model = avalon.define({ $id: "test", data: [{checked: false}, {checked: false}, {checked: false}], allchecked: false, checkAll: function() { var bool = this.checked model.data.forEach(function(el) { el.checked = bool }) }, checkOne: function() { if (!this.checked) { model.allchecked = false } else {//avalon已经为数组添加了ecma262v5的一些新方法 model.allchecked = model.data.every(function(el) { return el.checked }) } } }) </script> </head> <body> <table ms-controller="test" border="1"> <tr> <td><input type="checkbox" ms-duplex-radio="allchecked" data-duplex-changed="checkAll"/>全选</td> </tr> <tr ms-repeat="data"> <td><input type="checkbox" ms-duplex-radio="el.checked" ms-data-index=$index data-duplex-changed="checkOne"/>xxxxxxxxxxxx</td> </tr> </table> </body> </html>
我们仔细分析其源码,allchecked是用来控制最上面的复选框的打勾情况,数组中的checked是用来控制下面每个复选框的下勾情况。由于是使用ms-duplex,因此会监听用户行为,当复选框的状态发生改变时,就会触发data-duplex-change回调,将当前值传给回调。但这里我们不需要用它的value值,只用它的checked值。最上面的复选框对应的回调是checkAll,它是用来更新数组的每个元素的checked属性,因此一个forEach循环赋值就是。下面的复选框对应的checkOne,它们是用来同步最上面的复选框,只要它们有一个为false上面的复选框就不能打勾,当它们被打勾了,它们就得循环整个数组,检查是否所有元素都为true,是才给上面的checkall属性置为true。
再看用ms-duplex与$watch实现表格排序效果。
<!DOCTYPE HTML> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <script src="../avalon.js" ></script> <script> if (!Date.now) {//fix 旧式IE Date.now = function() { return new Date - 0; } } var model = avalon.define({ $id: "test", selected: "name", options: ["name", "size", "date"], trend: 1, data: [ {name: "aaa", size: 213, date: Date.now() + 20}, {name: "bbb", size: 4576, date:Date.now() - 4}, {name: "ccc", size: 563, date: Date.now() - 7}, {name: "eee", size: 3713, date: Date.now() + 9}, {name: "555", size: 389, date: Date.now() - 20} ] }) model.$watch("selected", function(v) { var t = parseFloat(model.trend) model.data.sort(function(a, b) { if (v === "name") { return t * a[v].localeCompare(b[v]) } else { var ret = a[v] > b[v] ? 1 : -1 return t * ret } }) }) model.$watch("trend", function(t) { var v = model.selected, t = parseFloat(t) model.data.sort(function(a, b) { var ret = a[v] > b[v] ? 1 : -1 return t * ret }) }) </script> </head> <body ms-controller="test"> <div style="color:red"> <p>本例子用于显示如何做一个简单的表格排序</p> <p>ms-repeat="array"相当于ms-repeat-el="array" </p> </div> <p> <select ms-duplex="selected"> <option ms-repeat="options">{{el}}</option> </select> <select ms-duplex="trend"> <option value="1">up</option> <option value="-1">down</option> </select> </p> <table width="500px" border="1"> <tbody > <tr ms-repeat="data"> <td>{{el.name}}</td> <td>{{el.size}}</td> <td>{{el.date}}</td> </tr> </tbody> </table> </body> </html>
当我们改动下拉框时,会通过ms-duplex同步selected, trend属性,而selected, trend的值改变时,就会触发对应的$watch回调,然后通过监控数组的sort方法实现表格排序。从而也可以看出监控数组与ms-repeat的强大。
我们再来一个文本域与下拉框的联动例子,它只用到ms-duplex,不过两个控件都是绑定同一个属性。
<!DOCTYPE html> <html> <head> <script src="avalon.js"></script> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script> avalon.define({ $id: "fruit", options: ["苹果", "香蕉", "桃子", "雪梨", "葡萄", "哈蜜瓜", "橙子", "火龙果", "荔技", "黄皮"], selected: "桃子" }) </script> </head> <body ms-controller="fruit"> <h3>文本域与下拉框的联动</h3> <input ms-duplex="selected" /> <select ms-duplex="selected" > <option ms-repeat-option="options" ms-value="option" >{{option}}</option> </select> </body> </html>
我们再看一个超级复杂的三级联动下拉框。
<!DOCTYPE html> <html> <head> <script src="avalon.js"></script> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script> var map = { "中国": ["江南四大才子", "初唐四杰", "战国四君子"], "日本": ["日本武将", "日本城堡", "幕府时代"], "欧美": ["三大骑士团", "三大魔幻小说", "七大奇迹"], "江南四大才子": ["祝枝山", "文征明", "唐伯虎", "周文宾"], "初唐四杰": ["王勃", "杨炯", "卢照邻", "骆宾王"], "战国四君子": ["楚国春申君黄歇", "齐国孟尝君田文", "赵国平原君赵胜", "魏国信陵君魏无忌"], "日本武将": ["织田信长", "德川家康", "丰臣秀吉"], "日本城堡": ["安土城", "熊本城", "大坂城", "姬路城"], "幕府时代": ["镰仓", "室町", "丰臣", "江户"], "三大骑士团": ["圣殿骑士团", "医院骑士团", "条顿骑士团"], "三大魔幻小说": ["冰与火之歌", "时光之轮", "荆刺与白骨之王国"], "七大奇迹": ["埃及胡夫金字塔", "奥林匹亚宙斯巨像", "阿尔忒弥斯月神殿", "摩索拉斯陵墓", "亚历山大港灯塔", "巴比伦空中花园", "罗德岛太阳神巨像"] } avalon.define("linkage", function(vm) { vm.first = ["中国", "日本", "欧美"] vm.second = map[vm.first[1]].concat() vm.third = map[vm.second[0]].concat() vm.firstSelected = "日本" vm.secondSelected = "日本武将" vm.thirdSelected = "织田信长" vm.$watch("firstSelected", function(a) { vm.second = map[a].concat() vm.secondSelected = vm.second[0] }) vm.$watch("secondSelected", function(a) { vm.third = map[a].concat() vm.thirdSelected = vm.third[0] }) }) </script> </head> <body > <div ms-controller="linkage"> <h3>下拉框三级联动</h3> <select ms-duplex="firstSelected" > <option ms-repeat="first" ms-value="el" >{{el}}</option> </select> <select ms-duplex="secondSelected" > <option ms-repeat="second" ms-value="el" >{{el}}</option> </select> <select ms-duplex="thirdSelected" > <option ms-repeat="third" ms-value="el" >{{el}}</option> </select> </div> </body> </html>
由于存在三个下拉框,需要的数据比较多,因此我们搞了一个map来存放它们。。然后我们先初始化第一个下拉框,vm.first = [”中国”, ”日本”, ”欧美”],默认是选中第二个(firstSelected)。然后初始化第二个下拉框,需要从map拷贝一份赋给second,然后再默认其选中项,然后是第三个下拉框……
接着是通过$watch回调实现联动,不用管第三个下拉框(因为它总是被动的),那么只有监听firstSelected, secondSelected。每次变化都需要从map找到正确的数组,复制一次赋给second与third,并且默认选中第一项。
最后奉上一用户做的多级联动效果,自己细细品味吧。
<!DOCTYPE html> <html lang="zh-cn"> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <script src="avalon.js"></script> <script> var data = [ {"id": 0, "name": "1公司", "grade": -1, "parentid": "-1"}, {"id": 1, "name": "广东公司", "grade": 0, "parentid": "0"}, {"id": 2012300001, "name": "广州1分公司", "grade": 1, "parentid": 1}, {"id": 200000000, "name": "广州分公司", "grade": 1, "parentid": 1}, {"id": 4050, "name": "天河分公司", "grade": 2, "parentid": 200000000}, {"id": 999182, "name": "工业园营销服务中心", "grade": 3, "parentid": 4050}, {"id": 4174, "name": "南沙分公司", "grade": 2, "parentid": 200000000}, {"id": 10121, "name": "南沙营销服务中心", "grade": 3, "parentid": 4174}, ] var a = avalon.define("test", function(vm) { vm.searchForm = []; vm.setSearchFormInit = function(currNode) { var childNodes = vm.getChildOrg(currNode); if (childNodes.length) vm.searchForm = [childNodes]; }; vm.setSearchForm = function(index) { //vm.searchForm._del(index,10)//在选中某个select后,取得index,删除它后边的所有成员 avalon.log("删除第" + index + "个元素后的所有成员") a.searchForm.removeAll(function(arr, i) { if (i > index) return true; return false; }); var currNode = this.value; var childNodes = vm.getChildOrg(currNode); if (childNodes.length) vm.searchForm.push(childNodes); }; vm.getChildOrg = function(id) { var retList = []; for (var i = 0; i < data.length; i++) { var elem = data[i] if (elem.parentid != id) continue; retList.push({ id: elem.id, name: elem.name, parentid: elem.parentid }); } return retList; } }) a.setSearchFormInit(0) </script> </head> <body ms-controller="test"> <div ms-repeat-form="searchForm"> <select ms-change="setSearchForm($index)"> <option></option> <option ms-repeat-el="form" ms-value="el.id">{{el.name}}</option> </select> </div> </body> </html>