jquery select2 .on（“更改”，函数（e）重置选项

i am using select2.

我正在使用select2。

Usage : if a value is "COUNTRY", i want to add a onchange event to the select2, else i want to remove the onchange event as shown below :

用法：如果值为“COUNTRY”，我想向select2添加onchange事件，否则我想删除onchange事件，如下所示：

var reportLevel = getReportLevel();

if (reportLevel != "COUNTRY") {
    $("#selected_countries").on("change", function(e) {
        prepareGlidModel(e);
    });
} else {
    $("#selected_countries").on("change", function(e) {
    });
}

Issue : Not being able to remove the onchange event, even if the else block is called. Events are called based upon the reportLevel value selected in a dropdown.

问题：即使调用了else块，也无法删除onchange事件。根据在下拉列表中选择的reportLevel值调用事件。

3 个解决方案

#1

try following:

尝试以下：

var reportLevel = getReportLevel(),
    // by default unbind/off change event
    $select = $("#selected_countries").off("change");

// and if country then bind it
if (reportLevel == "COUNTRY") {
   $select.on("change", function(e) {
       alert("you selected :" + $(this).val());
   });
}

Working example here: http://jsfiddle.net/JB89B/1/

这里的工作示例：http：//jsfiddle.net/JB89B/1/

#2

i think on else case you want to reset the value to default for this you have to use

我认为在其他情况下你想要将值重置为默认值，你必须使用它

$("#selected_countries").val('default value')

and if u just want to prevent the default action of onchange event than on else you can write

如果你只是想阻止onchange事件的默认动作而不是其他你可以编写

e.preventDefault()

this will help

这会有所帮助

#3

You can use off to deatach event handlers from your elements as shown below:

您可以使用off从元素中取消事件处理程序，如下所示：

$("#selected_countries").off('change');

#1