如何在代码中触发jQuery更改事件 [英] How to trigger jQuery change event in code

问题描述

我有一个工作正常的变更事件，但我需要让它进行递归。

I have a change event that is working fine but I need to get it to recurse.

所以我有一个在变化时触发的功能会改变 基于类选择器的其他下降（注意下拉，可能有多个）。此代理更改不会触发该功能，因此失败。我怎样才能让它工作？

So I have a function that is triggered on change that will "change" other drop downs based on a class selector (notice "drop downS", there could be more than one). This proxy change does not trigger the function and so fails. How can i get it to work?

$(document).ready(function () {
    var activeDropBox = null;

    $("select.drop-box").change(function () {
        var questionId = $(this).attr("questionId");
        var selectedAnswer = $(this).val();
        activeDropBox = this;

        alert(this.questionId);

        $.ajax(
        {
            type: "POST",
            url: answerChangedActionUrl,
            data: { questionId: questionId, selectedValue: selectedAnswer },
            success: function (data) {
                SetElementVisibility(data.ShowElement, questionId);
            }, error: function (XMLHttpRequest, textStatus, errorThrown) {
                alert('XMLHttpRequest:' + XMLHttpRequest.responseText);
                alert('textStatus:' + textStatus);
                alert('errorThrown:' + errorThrown);
            }
        });
    });

    function SetElementVisibility(visible, questionId) {
        // I would like each child to then trigger the change event...
        $(".childOf" + questionId)[visible ? 'show' : 'hide']('slow');

        // Suggested code
        //$(".childOf" + questionId + " select").trigger("change");

        if (!visible) {
            $(".childOf" + questionId + " select").attr('selectedIndex', 0);
        }
    }
}

到目前为止的建议似乎工作，但随着更改事件触发ajax帖子，它现在似乎失败了。我打算玩它，但这是我觉得的另一个问题。

The suggestions so far seem to work, but as the change event triggers an ajax post it now seems to fail here. I'm going to play around with it but that is something for another question I feel.

推荐答案

使用 trigger（）方法

$(selector).trigger("change");

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