使用javascript和jquery，用数组结构填充相关的选择框
使用javascript和jquery，用数组结构填充相关的选择框
提问于 2018-08-31 01:43:13
使用这个问题的答案，我已经能够根据另一个选择框的选择填充一个选择框。（我在这里发布了我的答案）从服务器端构建的数组结构中提取数据，存储在.js文件中并在html页面中引用。
现在我想添加第三个选择框。如果我有3组这样的数据（模型，制作，选项）（伪代码）：
cars : [Honda[Accord[Lx, Dx]], [Civic[2dr, Hatchback]],
[Toyota[Camry[Blk, Red]], [Prius[2dr,4dr]]
例如：如果选择本田，下一个选择框将具有[Accord Civic]，如果选择了Accord，则下一个选择框将具有[Lx Dx]
我怎么能够
1）创建一个数组结构来保存数据？这样的
2）我可以使用一个选择框中的值来引用下一个选择框所需的值
谢谢
编辑
我可以创建以下内容，但无法以有助于填充选择框的方式找出引用
var cars = [
{"makes" : "Honda",
"models" : [
{'Accord' : ["2dr","4dr"]} ,
{'CRV' : ["2dr","Hatchback"]} ,
{'Pilot': ["base","superDuper"] } ]
},
{"makes" :"Toyota",
"models" : [
{'Prius' : ["green","reallyGreen"]} ,
{'Camry' : ["sporty","square"]} ,
{'Corolla' : ["cheap","superFly"] } ]
} ] ;
alert(cars[0].models[0].Accord[0]); ---> 2dr
回答 2
Stack Overflow用户
发布于 2018-08-31 09:57:17
我更喜欢这样的数据结构：
var carMakers = [
{ name: 'Honda', models: [
{ name: 'Accord', features: ['2dr', '4dr'] },
{ name: 'CRV', features: ['2dr', 'Hatchback'] },
{ name: 'Pilot', features: ['base', 'superDuper'] }
]},
{ name: 'Toyota', models: [
{ name: 'Prius', features: ['green', 'superGreen'] },
{ name: 'Camry', features: ['sporty', 'square'] },
{ name: 'Corolla', features: ['cheap', 'superFly'] }
]}
];
给出带有id的三个选择列表：'maker'，'model'和'features'，你可以用它来操作它们（我相信这是非常自我解释的）：
// returns array of elements whose 'prop' property is 'value'
function filterByProperty(arr, prop, value) {
return $.grep(arr, function (item) { return item[prop] == value });
}
// populates select list from array of items given as objects: { name: 'text', value: 'value' }
function populateSelect(el, items) {
el.options.length = 0;
if (items.length > 0)
el.options[0] = new Option('please select', '');
$.each(items, function () {
el.options[el.options.length] = new Option(this.name, this.value);
});
}
// initialization
$(document).ready(function () {
// populating 1st select list
populateSelect($('#maker').get(0), $.map(carMakers, function(maker) { return { name: maker.name, value: maker.name} }));
// populating 2nd select list
$('#maker').bind('change', function() {
var makerName = this.value,
carMaker = filterByProperty(carMakers, 'name', makerName),
models = [];
if (carMaker.length > 0)
models = $.map(carMaker[0].models, function(model) { return { name: model.name, value: makerName + '.' + model.name} });
populateSelect($('#model').get(0), models);
$('#model').trigger('change');
});
// populating 3rd select list
$('#model').bind('change', function () {
var nameAndModel = this.value.split('.'),
features = [];
if (2 == nameAndModel.length) {
var makerName = nameAndModel[0],
carModel = nameAndModel[1],
carMaker = filterByProperty(carMakers, 'name', makerName);
if (carMaker.length > 0) {
var model = filterByProperty(carMaker[0].models, 'name', carModel)
if (model.length > 0)
features = $.map(model[0].features, function(feature) { return { name: feature, value: makerName + '.' + carModel + '.' + feature} })
}
}
populateSelect($('#feature').get(0), features);
})
// alerting value on 3rd select list change
$('#feature').bind('change', function () {
if (this.value.length > 0)
alert(this.value);
})
});
Stack Overflow用户
发布于 2018-08-31 11:04:48
感谢@Marko Dunic的回答，我能够构建一个数组（数据）结构，可以引用它来填充3个选择框。我没有使用实现代码只是因为我没有完全理解它...它作为发布工作。我将在以后学习jQuery时回到这段代码。我的代码发布在下面（显然，你对jQuery的引用可能有所不同）
<html><head>
<script language="Javascript" src="javascript/jquery-1.2.6.min.js"></script>
<script type="text/JavaScript">
var cars = [
{ name: 'Honda', models: [
{ name: 'Accord', features: ['2dr', '4dr'] },
{ name: 'CRV', features: ['2dr', 'Hatchback'] },
{ name: 'Pilot', features: ['base', 'superDuper'] }
]},
{ name: 'Toyota', models: [
{ name: 'Prius', features: ['green', 'superGreen'] },
{ name: 'Camry', features: ['sporty', 'square'] },
{ name: 'Corolla', features: ['cheap', 'superFly'] }
]
}
];
$(function() {
var options = '' ;
for (var i = 0; i < cars.length; i++) {
var opt = cars[i].name ;
if (i == 0){ options += '<option selected value="' + opt + '">' + opt + '</option>'; }
else {options += '<option value="' + opt + '">' + opt + '</option>'; }
}
$("#maker").html(options); // populate select box with array
var options = '' ;
for (var i=0; i < cars[0].models.length; i++) {
var opt = cars[0].models[0].name ;
if (i==0){options += '<option selected value="' + opt + '">' + opt + '</option>';}
else {options += '<option value="' + opt + '">' + opt + '</option>';}
}
$("#model").html(options); // populate select box with array
var options = '' ;
for (var i=0; i < cars[0].models[0].features.length; i++) {
var opt = cars[0].models[0].features[i] ;
if (i==0){options += '<option selected value="' + opt + '">' + opt + '</option>';}
else {options += '<option value="' + opt + '">' + opt + '</option>';}
}
$("#feature").html(options); // populate select box with array
$("#maker").bind("click",
function() {
$("#model").children().remove() ; // clear select box
for(var i=0; i<cars.length; i++) {
if (cars[i].name == this.value) {
var options = '' ;
for (var j=0; j < cars[i].models.length; j++) {
var opt= cars[i].models[j].name ;
if (j==0) {options += '<option selected value="' + opt + '">' + opt + '</option>';}
else {options += '<option value="' + opt + '">' + opt + '</option>';}
}
break;
}
}
$("#model").html(options); // populate select box with array
$("#feature").children().remove() ; // clear select box
for(var i=0; i<cars.length; i++) {
for(var j=0; j<cars[i].models.length; j++) {
if(cars[i].models[j].name == $("#model").val()) {
var options = '' ;
for (var k=0; k < cars[i].models[j].features.length; k++) {
var opt = cars[i].models[j].features[k] ;
if (k==0){options += '<option selected value="' + opt + '">' + opt + '</option>';}
else {options += '<option value="' + opt + '">' + opt + '</option>';}
}
break;
}
}
}
$("#feature").html(options); // populate select box with array
});
$("#model").bind("click",
function() {
$("#feature").children().remove() ; // clear select box
for(var i=0; i<cars.length; i++) {
for(var j=0; j<cars[i].models.length; j++) {
if(cars[i].models[j].name == this.value) {
var options = '' ;
for (var k=0; k < cars[i].models[j].features.length; k++) {
var opt = cars[i].models[j].features[k] ;
if (k==0){options += '<option selected value="' + opt + '">' + opt + '</option>';}
else {options += '<option value="' + opt + '">' + opt + '</option>';}
}
break ;
}
}
}
$("#feature").html(options); // populate select box with array
});
});
</script>
</head> <body>
<div id="selection">
<select id="maker"size="10" style="{width=75px}"></select>
<select id="model" size="10" style="{width=75px}"></select>
<select id="feature" size="10"style="{width=75px}"></select>
</div></body></html>
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原文链接：
https://stackoverflow.com/questions/-100000705
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