就目前三大前端主流数据驱动框架(vue,ng,react)而言,均具有创建自定义组件的api,但都是必须先做到事先写好挂载点,这个挂载点可以是原有静态元素标签也可以是自定义模板;对于多种组件通过同一数据流生成的,如果事先在页面上写好挂载点(mounted),然后通过dom操作去动态添加,会遇到类似这样一条错误提示信息:Failed to execute 'appendChild' on 'Node': parameter 1 is not of type 'Node'.(…)。这又是为何呢,下一步该怎么办?
原因是任何dom操作的对象必须是符合W3C标准的元素,除非如下所述的,改写生成html元素对象的原型(HTMLElement.prototype)并注册自定义元素,从而实现动态生成自定义组件的效果。
不过,大家都明白使用数据驱动框架的初衷就是尽可能避免dom操作,而如下代码中还是有一些dom操作的,就目前认知水平而言,感觉这些必要的dom操作还是避免不了的。其它不多说了,直接看代码。。。
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta http-equiv="Content-type" content="text/html,charset=utf-8"/> <meta http-equiv="X-UA-Compatible" content="IE-edge"> <meta content="width=device-width,initial-scale=1"> <link href="https://www.jb51.net/css/mui.min.css"> <link href="https://www.jb51.net/css/app.css"> <script src="https://www.jb51.net/js/vue.js" type="text/javascript"></script> </head> <body> <div> </div> </body> <script src="https://www.jb51.net/js/fuhao-components.js" type="text/javascript"></script> <script> var jsonData = [ { "keyname": "姓名鄂然失色而热重重中之重重中之重杂志的热热", "type": "text", "key": "name11" }, { "value": "姓名鄂之重杂志的热热", "key": "name11" }, { "keyname": "姓名鄂然失色而热热热热是重中之重重中之重重中之重杂志的热热", }, { "keyname": "姓名鄂然失色而热热热热是重中之重重中之重重中之重杂志的热热", "type": "textarea", "key": "name" }, { "keyname": "性别", "type": "radio", "key": "sex", "values": [ { "key": "man", "value": "男辅导班" }, { "key": "women", "value": "女" } ] }, { "keyname": "复选", "type": "checkbox", "key": "checkbox", "values": [ { "key": "man", "value": "男" }, { "key": "women", "value": "女" } ] }, { "keyname": "类型", "type": "select", "key": "type1", "values": [ { "key": "type1", "value": "类型1" }, { "key": "type2", "value": "类型2" }, { "key": "type3", "value": "类型3" }, { "key": "type4", "value": "类型4" } ] }, { "keyname": "定位", "type": "gps", "key": "btn", "value": "地图获取定位" }, { "keyname": "拍照", "type": "photo", "key": "btn", "value": "拍照" } ]; (function () { AnalyJson(jsonData); })(); function AnalyJson(data) { if ('id' in data) { arguments.callee(data.values); } else { if ('name' in data) { htmlname = data.name; CreateInputViewer(data.name); arguments.callee(data.values); } else { if ('type' in data) { CreateInputViewer(data); } else { for (var p in data) { CreateInputViewer(data[p]); } } } } } function CreateInputViewer(data) { switch (data.type) { case 'text': { fh_C(data, 'c-input-text' + '-' + data.key, 'fhInputText', textTpl); break; } case 'textarea': { fh_C(data, 'c-textarea' + '-' + data.key, 'fhInputTextarea', textareaTpl); break; } case 'radio': { fh_C(data, 'c-input-radio' + '-' + data.key, 'fhInputTextarea', radioTpl); break; } case 'checkbox': { fh_C(data, 'c-input-checkbox' + '-' + data.key, 'fhInputCheckbox', checkboxTpl); break; } case 'select': { fh_C(data, 'c-select' + '-' + data.key, 'fhSelect', selectTpl); break; } case 'photo': { fh_C(data, 'c-photo' + '-' + data.key, 'fhPhoto', photoTpl); break; } case 'gps': { fh_C(data, 'c-gps' + '-' + data.key, 'fhGPS', gpsTpl); break; } default: { fh_C(data, 'c-default' + '-' + data.key, 'fhInputDefault', defaultTpl); break; } } } function fh_C(d, c, cn, tpl) { console.log(d); Vue.component(c, { template: tpl, // props:['key','keyname','values','value'], data: function () { return d } }); new Vue({ el: '.mui-content', components: { cn: cn }, }); var MyElementProto = Object.create(HTMLElement.prototype); MyElementProto.createdCallback = function () { this.innerHTML = tpl }; var MyComponent = document.registerElement(c, {prototype: MyElementProto}); document.querySelector('.mui-content').appendChild(new MyComponent()); } </script> </html>
为了保持代码的可维护性及易读性,我将模板部分单独放在fuhao-components.js的文件里边,如下所示:
var textTpl=''; <div> <input :type="type" :name="key" :placeholder="keyname" > </div> var textareaTpl= ''; <div> <textarea rows="5" :placeholder="keyname"> </textarea> </div> var radioTpl= ''; <form> <divv-for="value in values"> <label>{{value.key}}</label> <input :name="key" :type="type" :value="key"> </div> </form> var checkboxTpl= ''; <form> <divv-for="value in values"> <label>{{value.key}}</label> <input :name="key" :type="type" :value="key"> </div> </form> var selectTpl= ''; <div> <h5 v-text="keyname"></h5> <select :name="key"> <option value="key" v-text="value.key" v-for="value in values">{{value.key}}</option> </select> </div> var photoTpl= ''; <div> <span v-text="keyname"></span> <button :name="key">拍照</button> <img :id="key"> </div> var gpsTpl=''; <div> <button :id="key"> 获取定位 </button> </div> var defaultTpl= ''; <div v-if="key"> <ul> <li> <span v-text="key"></span> <span v-text="value"></span> </li> </ul > </div>
最终渲染效果如下: