删除动态select上的子节点
删除动态select上的子节点
提问于 2012-04-10 21:31:40
我正在创建一个动态选择表单。基本上，用户从select中选择一个选项，然后根据他们选择的选项进入一个数据对象，然后根据他们之前的答案生成一个新的选择。在他们回答了3个关于他们的车辆选择的问题后，它会打印出他们的车辆选择。
我遇到的问题是有能力动态更改以前的选项。我希望他们能够更改之前的选择，这将删除后面的选择
例如。用户首先选择Car、Ford，然后显示型号选择。如果用户返回并将汽车更改为卡车。我想删除福特和车型选择。下面是我的代码中保存数据并动态创建新选择的部分
var data=new Object();// create a new data object to hold info
data['init']=['Car','Truck','SUV'];
data['Car']=['Audi','Dodge','Ford','Volkswagon'];
data['Audi']=['A4','TT','R8'];
data['Dodge']=['Charger','Challenger','Stealth'];
data['Ford']=['Focus','Fusion','Mustang'];
data['Volkswagon']=['Jetta','GTI','Beetle'];
data['Truck']=['Dodge Truck','Ford Truck','Toyota Truck'];
data['Dodge Truck'] = ['Ram-1500','Ram-2500','Ram-3500'];
data['Ford Truck'] = ['F-150','F-250','Ranger'];
data['Toyota Truck'] = ['Tundra','Tacoma'];
data['SUV']=['Dodge SUV','Ford SUV','Toyota SUV'];
data['Dodge SUV'] = ['Durango','Journey','Caliber'];
data['Ford SUV'] = ['Escape','Edge','Explorer'];
data['Toyota SUV'] = ['Rav4','Highlander','4runner'];
var hold = data['init'];//Sets data to 'init' by default
var selectedArray = [];//This array holds the selected options (to be used to display the vehicle name)
function init(){//call first to create the first select box and populate with 'init'
firstSelect = document.createElement('select');
firstSelect.setAttribute("onChange","createSelect(this.value)");
createSelect('init');
}
//Main create function for select boxes
function createSelect(value){
selectHold = value;//sets selectHold to the value of the selected item (this will be used for displaying the name in disName)
//This just prevents it from adding "Car, Truck or SUV to the selectedArray
if(value != 'init' && value != 'Truck' && value != 'Car' && value != 'SUV' && value != 'Select your vehicle options'){
selectedArray.push(selectHold);
}
hold=data[value];// sets this holder to the value of the selected item for the if statement
if(hold){ //just checks to see if hold exists
var selEle = document.createElement('select');//creates new select element
//gives selEle onchange function
selEle.setAttribute("onChange","createSelect(this.value)");
//Creates the "default" option. Forcing them to pick something.
var defaultOpt = document.createElement('option');
var vehInfo = document.createTextNode("Select your vehicle options");
defaultOpt.appendChild(vehInfo);
selEle.appendChild(defaultOpt);
//Populates the options and adds it to the document
for(var i = 0, l = hold.length; i < l; i++){
var newOpt = document.createElement('option');
newOpt.appendChild(document.createTextNode( hold[i]));
newOpt.setAttribute('value',hold[i]);
selEle.appendChild(newOpt);
}
//put select on the page
document.getElementById('top-container').appendChild(selEle);
}
else{ //if not, then put out final form
disName(selectHold,selectedArray);//call disName function an dpass it the value of selectHold
}
}HTML：
<div id="top-container">
<h1>Awesome<br/>
Car<br/>
Picker</h1>
</div>
<div id="middle-container">
<h2>Your vechle choice:</h2>
</div>
<div id="bottom-container">
<div id="mail-form">
<form name='mail-form'>
<label>Name</label>
<input name="name" autofocus>
<label>Email</label>
<input name="email">
<label>Credit Card number</label>
<input name="cc">
<input id="submit" name="submit" value="Submit" onClick="validate()">
</form>
</div>
</div>
<body>我正在考虑的是检查，看看选择是否是父节点(顶层容器)的lastChild。如果不是，则删除它的子项，直到它到达只有更改的选择和之前的任何选择的点为止。
有什么建议吗？谢谢!
回答 1
Stack Overflow用户
发布于 2012-04-10 21:43:14
在您的createSelect函数中，使用类似selEle.id = 'newID';的内容为新元素分配一个ID。
在调用createSelect函数之前，请检查新元素是否存在，如果存在，则将其删除：
if (document.getElementById('newID'))
document.getElementById('top-container').removeChild(document.getElementById('newID'));页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/10089811
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