如何在jQuery事件处理程序中使用参数调用JavaScript函数? [英] How to call javascript function with parameter in jquery event handler?

问题描述

我被困住了.搜索并尝试了几个小时.

I am stuck. Searched and tried for hours.

我仍然无法使其正常工作.好的，我只放置源代码以明确说明我要完成的工作.

I still can't make it work. Okay, I'll just put the source code to make it clear what I want to accomplish.

    <script src="//ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js"></script>
    <script type="text/javascript">
    var date_fmt="yyyy-mm-dd";
    var time_fmt="HH:MM";
    var date_field="#id_start_0, #id_end_0"; //id refering to html input type='text'
    var time_field="#id_start_1, #id_end_1"; //id refereing to html input type='text'


    function clearFmt(fmt_type)
    { 
        if($(this).val() == fmt_type) {
            $(this).val("");

        }
    }

    function putFmt(fmt_type)
    {
        if($(this).val() == "") {
            $(this).val(fmt_type);
        }
    }


$(document).ready(function() {

    $(date_field).attr("title",date_fmt);
    $(time_field).attr("title",time_fmt);

    $(date_field).click(function() {
        clearFmt(date_fmt);
    });   

    $(date_field).blur(function(){
        putFmt(date_fmt);
    });

    $(time_field).click(function(){
        clearFmt(time_fmt);
    });   

    $(time_field).blur(function(){
        putFmt(time_fmt);
    });

});
</script>

帮助?

推荐答案

使用jquery bind 方法:

Use the jquery bind method:

function myfunc(param) {
    alert(param.data.key);
}

$(document).ready( function() {
    $("#foo").bind('click', { key: 'value' }, myfunc);
});

另请参阅我的 jsfiddle .

===更新===

自jquery 1.4.3起，您还可以使用:

since jquery 1.4.3 you also can use:

function myfunc(param) {
    alert(param.data.key);
}

$(document).ready( function() {
    $("#foo").click({ key: 'value' }, myfunc);
});

另请参阅第二篇 jsfiddle .

===更新2 ===

=== UPDATE 2 ===

每个功能都有自己的this.在此函数中调用clearFmt后，this不再是单击的元素.我有两个类似的解决方案:

Each function has his own this. After calling clearFmt in this function this is no longer the clicked element. I have two similar solutions:

在函数中添加一个参数，例如element并将$(this)替换为element.

In your functions add a parameter called e.g. element and replace $(this) with element.

function clearFmt(element, fmt_type) {
    if (element.val() == fmt_type) {
        element.val("");
    }
}

调用该函数必须添加参数$(this).

Calling the function you have to add the parameter $(this).

$(date_field).click(function() {
    clearFmt($(this), date_fmt);
}); 

另请参阅我的第三个jsfiddle .

-=-

替代方法:

function clearFmt(o) {
    if ($(o.currentTarget).val() == o.data.fmt_type) {
        $(o.currentTarget).val("");
    }
}
$(date_field).click({fmt_type: date_fmt}, clearFmt); 

另请参阅我的第四本jsfiddle .

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