Javascript - 根据动态填充的下拉菜单转到 url

Javascript - Goto url based on dynamically populated drop down

我创建了一个条件表单,需要在单击“提交”后定向到特定的产品页面。这可能与这段代码有关吗?我无法弄清楚如何 link 数组值到 URL 变量。

Here's the JSFiddle

a=new Array("V1-1: 1/4-4 900-4500#", "V1-1 Light-Weight Compact Solution", "V1-2: 1/2-36 150-600#","V1-3: 1/2-2, 150-600#","V1-4: 4-36 900-4500#");
b=new Array('NexTech® R Series Valves','NexTech® E Series Valves','TrunTech® Valves', 'PulseJet Valves');
c=new Array('Coking Isolation Valves','Coking Switch Valves');
d=new Array('Three-Way Valves','Four-Way Valves');
e=new Array('IsoTech®');
f=new Array('Xactrol® Mark I Valves', 'Xactrol® Mark II Valves', 'Xactrol® Mark III Valves');
g=new Array('PulseJet Valves','Ecopack®');
h=new Array('AbrasoCheck® Slurry Check Valves', 'AbrasoTech® Slurry Ball Valves');
i=new Array('Electronic Relief Valves');
j=new Array('ValvXpress® Automated Valve Packages');
k=new Array('Acid Injection Valves');
l=new Array('Double Block-and-Bleed Valves');
m=new Array('Turbine Bypass System');
n=new Array('Check Valves');
o=new Array('ValvXpress®','EcoPack®','ValvPerformance Testing®','Slurry Valves','Acid Injection Valves','Double Block-and-bleed Valves','Rhinoite® Hardfacing','Switch Valves','HVOF RiTech®','Cryogenic Valves');

populateSelect();

$(function() {

      $('#cat').change(function(){
        populateSelect();
    });

});


function populateSelect(){
    cat=$('#cat').val();
    $('#item').html('');


    if(cat=='a'){
        a.forEach(function(t) { 
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='b'){
        b.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='c'){
        c.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='d'){
        d.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='e'){
        e.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='f'){
        f.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='g'){
        g.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='h'){
        h.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }


    if(cat=='i'){
        i.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='j'){
        j.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='k'){
        k.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='l'){
        l.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='m'){
       m.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='n'){
        n.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }

    if(cat=='o'){
        o.forEach(function(t) {
            $('#item').append('<option>'+t+'</option>');
        });
    }





} 

您可以使用已有的标记将这些选定的值传递到产品页面,只需向表单添加一个操作

<form action="yourpageurl" method="get">

您需要编写您的产品页面以动态显示任何必要的信息或根据传递的参数进行重定向。由于我们在上面选择了 get 方法,参数将作为查询字符串的一部分(url 的一部分)传递,但您也可以使用 POST.

我想我会采用这种方法。存储一个对象数组,每个对象都包含产品名称和该产品的适当 url。然后(假设您使用的是表单)您可以将表单的操作更改为所选选项的值。

旁注:建议使用括号表示法 ([]) 而不是 new Array()。您可以在 here 和其他来源阅读更多相关信息。此外,由于在 populatSelect 函数中,您的 cat 只会是一个值,因此您应该使用 if..else if..else if.. 结构。在匹配的情况下,您将完全离开 if..else if 表达式,从而节省时间。而如果您保留 if..if..if..,即使您立即找到匹配项,您也必须评估所有这些。

编辑:您绝对应该遵循其他一些答案正在使用的概念(即使用字典,这将使您无需所有 if 检查)。

var cats = {
  a: [
       { product: 'V1-1: 1/4-4 900-4500#', url: '<product url>' },
       { product: 'V1-1 Light-Weight Compact Solution', url: '<product url>' },
       { product: 'V1-2: 1/2-36 150-600#', url: '<product url>' },
       { product: 'V1-3: 1/2-2, 150-600#', url: '<product url>' },
       { product: 'V1-4: 4-36 900-4500#', url: '<product url>' }
  ],
  b: [
       { product: 'NexTech® R Series Valves', url: '<product url>'},
       { product: 'NexTech® E Series Valves', url: '<product url>' },
       { product: 'TrunTech® Valves', url: '<product url>' },
       { product: 'PulseJet Valves', url: '<product url>' }
  ],

// same for the rest of your categories
};

populateSelect();

$(function() {
    $('#cat').change(function(){
        populateSelect();
    });
});


function populateSelect(){
    var cat = $('#cat').val();
    $('#item').html('');

    appendProducts(cats[cat]);
}

function appendProducts(arr) {
    arr.forEach(function(t) {
            $('#item').append('<option value="' + t.url + '">'+ t.product +'</option>');
        });
}

$('form').submit(function() {
    this.action = $('select').find(':selected').val();
});

首先,您违反了DRY principle。不要为每组产品设置单独的变量,而是将它们中的每一个存储在一种字典结构中,例如对象。

这将是我的第一次修订

var dict = {
    a: ["V1-1: 1/4-4 900-4500#", "V1-1 Light-Weight Compact Solution", "V1-2: 1/2-36 150-600#","V1-3: 1/2-2, 150-600#","V1-4: 4-36 900-4500#"],
    b: ['NexTech® R Series Valves','NexTech® E Series Valves','TrunTech® Valves', 'PulseJet Valves'],
    c: ['Coking Isolation Valves','Coking Switch Valves'],
    d: ['Three-Way Valves','Four-Way Valves'],
    e: ['IsoTech®'],
    f: ['Xactrol® Mark I Valves', 'Xactrol® Mark II Valves', 'Xactrol® Mark III Valves'],
    g: ['PulseJet Valves','Ecopack®'],
    h: ['AbrasoCheck® Slurry Check Valves', 'AbrasoTech® Slurry Ball Valves'],
    i: ['Electronic Relief Valves'],
    j: ['ValvXpress® Automated Valve Packages'],
    k: ['Acid Injection Valves'],
    l: ['Double Block-and-Bleed Valves'],
    m: ['Turbine Bypass System'],
    n: ['Check Valves'],
    o: ['ValvXpress®','EcoPack®','ValvPerformance Testing®','Slurry Valves','Acid Injection Valves','Double Block-and-bleed Valves','Rhinoite® Hardfacing','Switch Valves','HVOF RiTech®','Cryogenic Valves']
};

$(function() {
    // attach an 'change' event handler
    // THEN trigger the event handler to call the function from the start
    $('#cat').change(populateSelect).trigger('change');
});

function populateSelect() {
    // this refers to the current element
    // get the selected value
    var cat = this.value;
    // always a good idea to cache your element that you will be re-using (maybe move it outside the function too)
    var items = $('#item');

    items.html('');
    // check if there are products associated with the selected value
    if (dict.hasOwnProperty(cat)) {
        // show products
        dict[cat].forEach(function(product) { 
            items.append('<option>' + product + '</option>');
        });
    }
}

现在,就你的实际问题而言。我们可以修改数组,让它也包含一个url。为简单起见,您可以使用数组数组,例如

a: [["V1-1: 1/4-4 900-4500#", "url"], ["V1-1 Light-Weight Compact Solution", "url"], ...]

或对象数组以提高可读性,例如

a: [{ name: "V1-1: 1/4-4 900-4500#", url: "url" }, { name: "V1-1 Light-Weight Compact Solution", url: "url"}, ...]

这是我使用对象数组的第二次修订。 (我缩短字典只是为了展示插图)。

var dict = {
    a: [
        { 
            name: "V1-1: 1/4-4 900-4500#",
            url: "http://www.bing.com"
        },
        {
            name: "V1-1 Light-Weight Compact Solution", 
            url: "http://www.google.com"
        },
        {
            name: "V1-2: 1/2-36 150-600#",
            url: "http://www.yahoo.com"
        },
    ],
    b: [
        {
            name: 'NexTech® R Series Valves',
            url: 'http://www.nike.com'
        },
        {
            name: 'NexTech® E Series Valves',
            url: 'http://www.walmart.com'
        }
    ],
    c: [{
        name: 'Coking Isolation Valves',
        url: 'http://www.adidas.com'
    }],
};

$(function() {
    // cache element so that you don't re-search the DOM multiple times
    var $items = $('#item');

    $('#cat').change(populateSelect).trigger('change');
    $('#goto').click(redirectToURL);

    // place the functions within the document.ready so that they have access to the cached elements
    function populateSelect() {
        $items.html('');
        if (dict.hasOwnProperty(this.value)) {
            dict[this.value].forEach(function(product) {
                // you can store the URL in HTML5-data attribute to use it later
                $items.append('<option data-url="' + product.url + '">' + product.name +'</option>');
            });
        }
    }

    function redirectToURL() {
        // get the URL from the selected option's data-url and redirect to it
        window.location.href = $items.find(':selected').data('url');
    }
});

从技术上讲,您不是 "submitting" 表单,而只是 "redirecting" -- 所以我不会使用提交按钮,而只是一个普通按钮。

<input type="button" id="goto" value="submit">

下面是最终修订版的 demo。你得修字典。