Question

我在树枝上有一个嵌套的循环，我得到了1,1,1,1 / 2,2,2,2 / 3,3,3,3形式的元素加倍。如何使用第一个循环从第二个循环访问数据而不重复元素？

{% for form in forms %}
    {% for question in surveyQuestions %}
        <div class="overlay-container tab-content">
            <div role="tabpanel" class="show-rendered-form tab-pane in fade active" id="show-rendered-form">
                {% form_theme form with ['bootstrap_3_horizontal_layout.html.twig'] %}
                {{ form(form) }}
                <div class="overlay-mask">
                    <div class="btn-group">
                        <a class="edit-action btn btn-default" href="#show-edit-form"
                           data-question-id="{{ question.id }}" aria-controls="show-rendered-form"
                           role="tab" data-toggle="tab">Editeaza</a>
                        <a class="delete-action btn btn-default" href="#show-rendered-form"
                           data-question-id="{{ question.id }}" aria-controls="" role="tab"
                           data-toggle="tab">Sterge</a>
                    </div>
                </div>
            </div>
            <div role="tabpanel" class="show-edit-form tab-pane" id="show-edit-form">

            </div>
        </div>
    {% endfor %}
{% endfor %}

Answer 1

假设我上面的评估是正确的：为什么不这样做呢？

我们使用经典for循环而不是使用foreach循环，并使用索引作为surveyQuestions和{% for i in 0..(forms|length - 1)%} <div class="overlay-container tab-content"> <div role="tabpanel" class="show-rendered-form tab-pane in fade active" id="show-rendered-form"> {% form_theme form with ['bootstrap_3_horizontal_layout.html.twig'] %} {{ form(forms[i]) }} <div class="overlay-mask"> <div class="btn-group"> <a class="edit-action btn btn-default" href="#show-edit-form" data-question-id="{{ surveyQuestions[i].id }}" aria-controls="show-rendered-form" role="tab" data-toggle="tab">Editeaza</a> <a class="delete-action btn btn-default" href="#show-rendered-form" data-question-id="{{ surveyQuestions[i].id }}" aria-controls="" role="tab" data-toggle="tab">Sterge</a> </div> </div> </div> <div role="tabpanel" class="show-edit-form tab-pane" id="show-edit-form"> </div> </div> {% endfor %}的标识符：

def test_yield(n):
    for i in range(n):
        yield str(i), str(i+1)
print '\n'.join([elem for seg in test_yield(5) for elem in seg])

twig嵌套循环获取更多元素

1 个答案: