jQuery .trigger（“更改”）无法正常工作 [英] jQuery .trigger("change") not working

问题描述

我无法使用 .trigger（更改）来工作。有谁知道为什么？

I can't get .trigger("change") to work. Anyone know why?

jQuery(document).ready(function () {

    jQuery("select[id='DROPDOWNID']").change(function () {

        var selectedIndex = jQuery("select[id='DROPDOWNID']").prop('selectedIndex');

        switch (selectedIndex) {
            case 0:
                hideVarforProspekt();
                break;
            case 1:
                hideOrdervarde();
                break;
            case 2:

                break;
            case 3:
                hideSektor();
                break;
        }
    });

    ** jQuery("select[id='DROPDOWNID']").trigger("change"); **


    function hideVarforProspekt() {
        jQuery("input[id='IDFROMSHAREPOINT']").closest('tr').hide();
    }

    function hideSektor() {
        jQuery("table[id='IDFROMSHAREPOINT']").closest('tr').hide();
    }

    function hideUppskOrder() {
        jQuery("input[id='IDFROMSHAREPOINT']").closest('tr').hide();
    }
});

推荐答案

有时不需要使用触发器：

Sometimes the usage of trigger is not necessary:

// use just jQuery("#DROPDOWNID") instead
var select = jQuery("select[id='DROPDOWNID']");

// placing the handler in separate function
var changeHandler = function () {
    var selectedIndex = select.prop('selectedIndex');
    switch(selectedIndex) {
        case 0:
            hideVarforProspekt();
        break;
        case 1:
            hideOrdervarde();
        break;
        case 2:

        break;
        case 3:
            hideSektor();
        break;
    }
}

// cache your jQuery selectors. It's a good practice
// and improves the readability
select.change(changeHandler);

// triggering
changeHandler();

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