如何动态附加 jquery 函数

Question

是否可以动态追加 jquery 函数后另一个..

这是我试过的方法

$('div#bottomPart').children().getNext(3).children().children().find('p').eq(3).text();

function getNext(num) {
    var appendNext = "";
    for (var i = 0; i < num; i++) {
        appendNext = appendNext + next();
    }
    return appendNext;
}

不要评判代码，它只是为了让大家了解我的想法。

我正在尝试在选择器中使用 for 循环添加 next()，例如

如果getNext(1) then it should return the selector like $('div#bottomPart').children().next().children().children().find('p').eq(3).text();

或者如果getNext(2) then it should return the selector like $('div#bottomPart').children().next().next().children().children().find('p').eq(3).text();

这是我的 HTML:

<div id="bottomPart">
    <div class="card d-flex flex-row mb-3 table-heading">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center" id="compareHeading">
                <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Parameters</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">
                    <img class="card-img-top" style="width: 7rem; object-fit: contain;" src="/static/images/Go Digit General Insurance Company Ltd..jpg" alt="Go Digit General Insurance Company Ltd.">
                </p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">
                    <img class="card-img-top" style="width: 7rem; object-fit: contain;" src="/static/images/Reliance General Insurance Company Ltd..jpg" alt="Reliance General Insurance Company Ltd.">
                </p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">ENTERPRISE</p>
            </div>
        </div>
    </div>
    <div class="card d-flex flex-row mb-3">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
                <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Own Damage Cover</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od1</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od2</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od3</p>
            </div>
        </div>
    </div>
    <div class="card d-flex flex-row mb-3">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
            <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Team permissions</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp1</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp2</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp3</p>
        </div>
    </div>
</div>
<div class="card d-flex flex-row mb-3">
    <div class="d-flex flex-grow-1 min-width-zero">
        <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
            <p class="list-item-heading mb-0 truncate width-30 w-xs-100">24/5 Support</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su51</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su52</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su53</p>
        </div>
    </div>
</div>
<div class="card d-flex flex-row mb-3">
    <div class="d-flex flex-grow-1 min-width-zero">
        <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
            <p class="list-item-heading mb-0 truncate width-30 w-xs-100">24/7 Support</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su71</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su72</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">su73</p>
        </div>
    </div>
</div>
<div class="card d-flex flex-row mb-3">
    <div class="d-flex flex-grow-1 min-width-zero">
        <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
            <p class="list-item-heading mb-0 truncate width-30 w-xs-100">User actions audit log</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">log1</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">log2</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">log3</p>
        </div>
    </div>
</div>

因为我正在使用 for 循环（不是上面的循环）根据用户提供的数据在我的 html 中找到 p 标签。

如果有附加 next() 函数的解决方案，对我来说会容易得多..

那有可能吗？？

Answer 1

看看这是否对你有帮助：

function getNext(selectorJquery, methodsValues) {
    var next = $(selectorJquery);
    $(methodsValues).each(function() {
        for (var method in this) {
            if (this[method] !== null) {
                next = next[method](this[method]);
            } else {
                next = next[method]();
            }
        }
    });

    return next;
}

var methodsValues = [
    {children: null},
    {next: null},
    {children: null},
    {children: null},
    {find: 'p'},
    {eq: 3},
    {text: null}
];

console.log($('div#bottomPart').children().next().children().children().find('p').eq(3).text());
console.log(getNext($('div#bottomPart'), methodsValues));

var otherMethodsValues = [
    {children: null},
    {next: null},
    {next: null},
    {children: null},
    {children: null},
    {find: 'p'},
    {eq: 3},
    {text: null}
];

console.log($('div#bottomPart').children().next().next().children().children().find('p').eq(3).text());
console.log(getNext('div#bottomPart', otherMethodsValues));

Answer 2

你可以用 nextAll() 和 eq() 做你想做的事。下面是一个示例，它将 select 在第 3 里之后 2 里或 4 里。

$("#li3").nextAll().eq(1).css("color", "green")
$("#li3").nextAll().eq(3).css("color", "red")

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
  <ul>
    <li>1</li>
    <li>2</li>
    <li id="li3">3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
    <li>7</li>
    <li>8</li>
    <li>9</li>
    <li>10</li>
  </ul>

如果您真的想扩展 jQuery 以添加您自己的方法，您可以使用 jQuery.fn 来实现。

jQuery.fn.extend({
  getNext: function(cnt) {
    return $(this).nextAll().eq(cnt - 1)
  },
})
$("#li3").getNext(2).css("color", "green")
$("#li3").getNext(4).css("color", "red")

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
  <ul>
    <li>1</li>
    <li>2</li>
    <li id="li3">3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
    <li>7</li>
    <li>8</li>
    <li>9</li>
    <li>10</li>
  </ul>

或者按照您尝试使用 next()

的方式进行

jQuery.fn.extend({
  getNext: function(cnt) {
    var elem = $(this)
    while(cnt>0 && elem.length) {
      elem = elem.next()
      cnt--
    }
    return elem
  },
})
$("#li3").getNext(2).css("color", "green")
$("#li3").getNext(4).css("color", "red")

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div>
  <ul>
    <li>1</li>
    <li>2</li>
    <li id="li3">3</li>
    <li>4</li>
    <li>5</li>
    <li>6</li>
    <li>7</li>
    <li>8</li>
    <li>9</li>
    <li>10</li>
  </ul>

最后，当一个简单的 jQuery select 或者可以完成所有操作时，就没有必要进行所有链接了。

var text = $("#bottomPart > div:eq(2) div.card-body > p:eq(2)").text()
console.log(text)

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div id="bottomPart">
    <div class="card d-flex flex-row mb-3 table-heading">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center" id="compareHeading">
                <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Parameters</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">
                    <img class="card-img-top" style="width: 7rem; object-fit: contain;" src="/static/images/Go Digit General Insurance Company Ltd..jpg" alt="Go Digit General Insurance Company Ltd.">
                </p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">
                    <img class="card-img-top" style="width: 7rem; object-fit: contain;" src="/static/images/Reliance General Insurance Company Ltd..jpg" alt="Reliance General Insurance Company Ltd.">
                </p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">ENTERPRISE</p>
            </div>
        </div>
    </div>
    <div class="card d-flex flex-row mb-3">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
                <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Own Damage Cover</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od1</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od2</p>
                <p class="mb-0 text-primary w-20 w-xs-100 text-center">od3</p>
            </div>
        </div>
    </div>
    <div class="card d-flex flex-row mb-3">
        <div class="d-flex flex-grow-1 min-width-zero">
            <div class="card-body align-self-center d-flex flex-column flex-md-row justify-content-between min-width-zero align-items-md-center">
            <p class="list-item-heading mb-0 truncate width-30 w-xs-100">Team permissions</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp1</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp2</p>
            <p class="mb-0 text-primary w-20 w-xs-100 text-center">tp3</p>
        </div>
    </div>
</div>

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