In this vuejs shopping cart demo, in the v-text="item.quantity || n " line, I don’t know how to display the value of the selected item in the drop-down list to the v-text of the button. Could someone help me how to modify it?
v-text="item.quantity || n "
html:
<code><!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link href="//cdn.bootcss.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" rel="stylesheet"> <link href="//cdn.bootcss.com/font-awesome/4.6.3/css/font-awesome.min.css" rel="stylesheet" type='text/css'> <link href="//cdn.bootcss.com/tether/1.3.2/css/tether.min.css" rel="stylesheet"> <link href="//cdn.bootcss.com/tether/1.3.2/css/tether-theme-basic.min.css" rel="stylesheet"> <style> </style> </head> <body> <nav class="navbar navbar-light bg-faded"> <div class="container"> <button class="navbar-toggler hidden-sm-up" type="button" data-toggle="collapse" data-target="#exCollapsingNavbar2"> ☰ </button> <div class="collapse navbar-toggleable-xs" id="exCollapsingNavbar2"> <a class="navbar-brand cu_logo" href="{{ url('/') }}">Laravel-cart</a> <ul class="nav nav-pills pull-right"> @if (Auth::guest()) <li class="nav-item"> <a class="nav-link" href="{{ url('/login') }}">login</a> </li> <li class="nav-item"> <a class="nav-link" href="{{ url('/register') }}">register</a> </li> @else <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">{{ Auth::user()->name }}</a> <div class="dropdown-menu"> <div class="dropdown-divider"></div> <a class="dropdown-item" href="{{ url('/logout') }}"><i class="fa fa-btn fa-sign-out"></i>logout</a> </div> </li> @endif </ul> </div> </div> </nav> <div class="container"> <div class="card"> <h3 class="card-header">Cart</h3> <div class="card-block"> <div id="app"> <div class="row"> <div class="col-xs-2"> <label class="c-input c-checkbox"> <input type="checkbox" v-model="allSelected">Select All <span class="c-indicator"></span> </label> </div> <div class="col-xs-2"> Goods </div> <div class="col-xs-2"> Quantity </div> <div class="col-xs-2"> Unit Price </div> <div class="col-xs-2"> Subtotal </div> </div> <form> <div class="row" v-for="(index, item) in items"> <div class="col-xs-2"> <label class="c-input c-checkbox"> <input type="checkbox" v-model="item.selected" :value="item.id"/> <span class="c-indicator"></span> </label> </div> <div class="col-xs-2"> @{{ item.name }} </div> <div class="col-xs-2"> <div class="dropdown"> <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false" v-text="item.quantity || n "> //默認顯示從數(shù)據(jù)庫讀取的值，但是，當從下拉列表選擇的時候，需要顯示選擇的值，現(xiàn)在不能顯示。 </button> <ul class="dropdown-menu" aria-labelledby="dropdownMenu1"> <li v-for="n in nums"> <a class="dropdown-item" @click="fillIn(index, n)">@{{ n }}個</a> //下拉列表 </li> </ul> </div> </div> <div class="col-xs-2"> @{{ item.unit_price }} </div> <div class="col-xs-2"> @{{ item.unit_price * item.quantity }} </div> </div> <div class="row"> <div class="col-xs-3"> Sum </div> <div class="col-xs-5"> </div> <div class="col-xs-2"> @{{ sum }} </div> </div> <button type="submit" class="btn btn-primary" :disabled="sum === 0">Submit</button> </form> </div> </div> </div> </div> <script src="//cdn.bootcss.com/jquery/2.2.4/jquery.min.js"></script> <script src="//cdn.bootcss.com/tether/1.3.2/js/tether.min.js"></script> <script src="//cdn.bootcss.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js"></script> <script src="//cdn.bootcss.com/vue/1.0.24/vue.min.js"></script> <script src="//cdn.bootcss.com/vue-resource/0.7.3/vue-resource.min.js"></script> <script type="text/javascript"> Vue.config.debug = true; var vm = new Vue({ el: "#app", data: { items: [] }, ready: function () { this.$http.get('/api/cart').then(function (response) { response.data.forEach(function (item) { item.selected = false; }); vm.items = response.data; }, function (response) { // error callback }); }, methods: { fillIn: function (index, n) { this.items[index].num = n; } }, computed: { nums: function () { return [1, 2, 3, 4, 5]; }, allSelected: { get: function () { for (var i = 0, length = this.items.length; i < length; i++) { if (this.items[i].selected === false) { return false; } } return true; }, set: function (val) { for (var i = 0, length = this.items.length; i < length; i++) { this.items[i].selected = val; } } }, sum: function () { var totalAmount = 0; for (var i = 0, length = this.items.length; i < length; i++) { var item = this.items[i]; if (item.selected === true) { totalAmount += item.unit_price * item.quantity; } } return totalAmount; } } }); </script> </body> </html></code>
It’s really tiring to read this code on my phone...
v-model="items", wrong here;
v-model="items"
After ajax obtains the data, first manually add the required attributes selected, and then assign the value to items
selected
items
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