刪除動態 select 上的子節點

Question

我正在創建一個動態選擇表單。 基本上，用戶從 select 中選擇一個選項，然后根據他們選擇的選項進入數據 object，然后根據他們之前的答案生成一個新的選擇。 在他們回答了 3 個關於他們的車輛選擇的問題后，它會打印出他們的車輛選擇。

我遇到的問題是能夠即時更改以前的選項。 我想讓他們能夠更改之前的選擇，這會刪除后來的選擇

前任。 用戶首先選擇 Car、Ford，然后顯示 model 的選擇。 如果用戶返回並將 Car 更改為 Truck。 我想刪除 Ford 和 model 選擇。 這是我保存數據並動態創建新選擇的代碼部分

    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>

我在想的是檢查選擇是否是父節點（頂部容器）的 lastChild。 如果不是，則刪除它的子項，直到它處於只有更改的選擇以及位於它之前的任何選擇的位置。

有什么建議么？ 謝謝！

Answer 1

在您的createSelect function 中，使用類似selEle.id = 'newID'; .

在調用createSelect function 之前，檢查新元素是否存在，如果存在，將其刪除：

if (document.getElementById('newID'))
    document.getElementById('top-container').removeChild(document.getElementById('newID'));

刪除動態 select 上的子節點

問題描述

1 個解決方案

解決方案1
0 2012-04-10 13:43:13

刪除動態 select 上的子節點

問題描述

1 個解決方案

解決方案1 0 2012-04-10 13:43:13

解決方案1
0 2012-04-10 13:43:13