遇到 VueJS class 绑定问题，使用 vuejs v2.0+ Bootstrap v3.3.7

Question

好吧，我遇到了一个问题，尽管是一个奇怪的问题，我到处都找不到答案。

我们被指派用 Vue.js 创建一个购物车，我已经完成了我自己开始了这个项目，想看看我可以用 vuejs 做什么。问题出现在页面加载后，访问 "admin" 面板，我创建了一个警报管理器，以使用 bootstrap 即时创建警报，稍后将在 post 此处查看代码。问题是我想要复选框值并使用该选择来输入正确的 class 警报，即 "alert alert-success".

我正在使用 Bind，奇怪的是，classes 那种工作，只有 alert-danger 并且总是。我不知道为什么或我做错了什么，需要一双新的眼睛，也许我们可以让它发挥作用。下面是我修改后的代码，根据中断的代码创建了一个单独的 html/vuejs 页面......对象正在成功创建，问题出在页面输出的某处......代码将运行，但是你可能需要 link 一个实时的 vue 副本，因为代码太多无法上传，CDN 2.0.3 或更高版本应该可以工作。

//I have the VueJS file downloaded, and in the root folder... but dont want to upload this file to teh site due to the shear size. I am useing VueJS v2.1.2 i think, but it is definitly between 2.0.3 and 2.1.2

//this is the code only pertaining to the part that is breaking...

myAPP = new Vue({
  el: '#testapp',
  data:{
    alerts: [],
    newAlertObj: {
                  alertTitle:'',
                  alertMsg:'',
                  alerttypeSuccess:false,
                  alerttypeInfo:false,
                  alerttypeWarn:false,
                  alerttypeDanger:false,
                  alerttypeDismiss:false,
                  alerttypeAnimate:false
                  },
    alertadd:false,
    //radio options for alert add [[No longer used as the object is being created as far as i can tell correctly]]// 
    /*
    isSuccess:false,
    isInfo:false,
    isWarn:false,
    isDanger:false,
    //for check boxes//
    isAnimated:false,
    isDismissable:false*/
  },
  methods:{
    addAlertObj:function (){
      console.log(this.alerts.push(this.newAlertObj))
      //debug
      console.log(this.newAlertObj.alerttypeSuccess)
      console.log(this.newAlertObj.alerttypeInfo)
      console.log(this.newAlertObj.alerttypeWarn)
      console.log(this.newAlertObj.alerttypeDanger)
      console.log(this.newAlertObj.alerttypeDismiss)
      console.log(this.newAlertObj.alerttypeAnimate)

      this.newAlertObj={alertTitle:'',alertMsg:'',alerttypeSuccess:false,alerttypeInfo:false,alerttypeWarn:false,alerttypeDanger:false,alerttypeDismiss:false,alerttypeAnimate:false}
    },
    togglealertadder: function (){
      if (this.alertadd){
        this.alertadd=false
        this.newAlertObj={alertTitle:'',alertMsg:'',alerttypeSuccess:false,alerttypeInfo:false,alerttypeWarn:false,alerttypeDanger:false,alerttypeDismiss:false,alerttypeAnimate:false}
      }else{
        this.alertadd=true
      }
    }
  }
});

<! DOCTYPE html>
<html lang="en" charset="utf-8">
<head>
  <title>Test App</title>
  <script src="https://code.jquery.com/jquery-3.1.1.min.js" integrity="sha256-hVVnYaiADRTO2PzUGmuLJr8BLUSjGIZsDYGmIJLv2b8=" crossorigin="anonymous"></script> <!--jquery cdn-->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
  <link rel="stylesheet" href="style.css"> <!--site deffinitions and styles-->
  <script src="https://cdnjs.cloudflare.com/ajax/libs/vue/2.1.4/vue.js"></script>
</head>
<body>
  <div class="container">
    <div class="container-fluid">
      <!-- test of the alert creation elements only goes here -->
      <div id="testapp">
        <div id="AlertsNMessages">
          <!-- Log in state only messages -->
          <p class="alert alert-warning"><span style="font-weight:bold;">WARNING! </span> You are logged into ADMIN mode, remember to logout</p>
          <div class = "row">
            <div class="col-sm-2"></div>
            <div class="col-sm-8">
              <div class="panel panel-default">
                <div class="panel-heading">
                  <button type="button" class="btn btn-primary btn-block" @click="togglealertadder">Manage Alerts</button>
                </div>
                <div class="panel-body" v-if="alertadd">
                  <div class="form-group">
                    Alert Content:
                    <input class="form-control" placeholder="Alert Title" v-model="newAlertObj.alertTitle" /><br />
                    <input class="form-control" placeholder="Alert Text" v-model="newAlertObj.alertMsg" /><br />
                    Alert Options (Only select ONE option below!):<br />
                    <input type="checkbox" name="alerttype" v-model="newAlertObj.alerttypeSuccess"/> Sucess Formatting &nbsp;
                    <input type="checkbox" name="alerttype1" v-model="newAlertObj.alerttypeInfo" /> Info Formatting &nbsp;
                    <input type="checkbox" name="alerttype2" v-model="newAlertObj.alerttypeWarn" /> Warn Formatting &nbsp;
                    <input type="checkbox" name="alerttype3" v-model="newAlertObj.alerttypeDanger" /> Danger Formating<br /><br />
                    Alert Optional Options:<br />
                    <input type="checkbox" class="" v-model="newAlertObj.alerttypeDismiss" /> Dismissable &nbsp;
                    <input type="checkbox" class="" v-model="newAlertObj.alerttypeAnimate" /> Animate <br /><br />
                    <button type="button" class="btn btn-primary" @click="addAlertObj">Create Alert</button>
                  </div>

                  {{newAlertObj.alerttypeSuccess}}
                  {{newAlertObj.alerttypeInfo}}
                  {{newAlertObj.alerttypeWarn}}
                  {{newAlertObj.alerttypeDanger}}

                  <h4>Alerts and Message Administration:</h4>
                  <div id="testing" v-for="(item,index) in alerts">
                    <li style="list-style-type:none;">
                      <button type="button" class="btn btn-danger" @click="alerts.splice(index,1)">&times;</button>
                      {{alerts[index].alertTitle}}  &nbsp;
                      {{alerts[index].alertMsg}} &nbsp;

                      Success:{{alerts[index].alerttypeSuccess}}
                      Info:{{alerts[index].alerttypeInfo}}
                      Warn:{{alerts[index].alerttypeWarn}}
                      Danger:{{alerts[index].alerttypeDanger}}&nbsp;

                      Animate:{{alerts[index].alerttypeAnimate}}
                      Dismiss:{{alerts[index].alerttypeDismiss}}
                    </li><br />
                  </div>
                </div>
              </div>
            </div>
            <div class="col-sm-2"></div>
          </div>
          <!-- everybody messages -->
          <!-- It is here that the opbject gets translated to the page based on the opbject values.-->
          <!-- alert is a static class, the :class are the dynamic whih just format the alert apearence... but it shows only text. -->
          <div id="everybodymessages" v-for="(item,index) in alerts">
            <p class="alert"
                            :class="{
                                      'alert-sucess':alerts[index].alerttypeSuccess,
                                      'alert-info':alerts[index].alerttypeInfo,
                                      'alert-warning':alerts[index].alerttypeWarn,
                                      'alert-danger':alerts[index].alerttypeDanger
                                    }">
                                    {{alerts[index].alertTitle}} &nbsp; &nbsp;{{alerts[index].alertMsg}}</p>
          </div>
        </div>

      </div>
    </div>
  </div>
  <script src="testapp.js"></script>
</body>
</html>

我一直在用上面的代码进行调试，它似乎在 DIV id "everyonemessages" 周围停止工作。生成时，代码应该呈现 bootstrap 消息警报，其中 classes 从复选框中选择并绑定到静态警报 class.. 但所有打印在 html 是纯文本......我一直在尽我所能让它工作但不知所措......我会稍微编辑更多，但我认为现在这样很好：

感谢 posts，杰西 F

Answer 1

您似乎在尝试使用对象语法来绑定 classes (link to docs here)。特别是，文档状态：

We can pass an object to v-bind:class to dynamically toggle classes:
<div v-bind:class="{ active: isActive }"></div>
The above syntax means the presence of the active class will be determined by the truthiness of the data property isActive.

请注意，字符串 "false" 与布尔值 false 不同。字符串 "false" 为真，将计算为真。

因此，我的猜测是您需要从 :class 代码中删除 toString()：

<p class="alert" 
   :class="{ 
     'alert-success':alerts[index].alerttypeSuccess, 
     'alert-info':alerts[index].alerttypeInfo, 
     'alert-warning':alerts[index].alerttypeWarn,
     'alert-danger':alerts[index].alerttypeDanger }">

另外，请注意您为成功警报的 class 写了 alert-sucess。应该是alert-success（两个c）。

遇到 VueJS class 绑定问题，使用 vuejs v2.0+ Bootstrap v3.3.7

having an issue with a VueJS class binding issue, using vuejs v2.0+ Bootstrap v3.3.7

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