如何使用jQuery Dialog OK按钮调用函数？

Question

我正在尝试从Jquery对话框Ok按钮调用一个函数。

我尝试了这两种方法，

1

this.commentDialog = function(){
        $("#commentDialog").dialog( "destroy" );
        html = "<div id='cmtDialog'>";
        html += "Comment<textarea id='comment'></textarea></div>";
        $("#commentDialog").html(html);
        $("#commentDialog").dialog({
            title:"Search Result",
            bgiframe: true,
            height: 'auto',
            width: 'auto',
            modal: true,autoOpen: true,
            buttons: { "Ok": function() { this.saveComment();}}
            });

2

this.commentDialog = function(){
        $("#commentDialog").dialog( "destroy" );
        html = "<div id='cmtDialog'>";
        html += "Comment<textarea id='comment'></textarea></div>";
        $("#commentDialog").html(html);
        $("#commentDialog").dialog({
            title:"Search Result",
            bgiframe: true,
            height: 'auto',
            width: 'auto',
            modal: true,autoOpen: true,
            buttons: { "Ok": function() { saveComment();}}
            });

两者都不起作用！

我如何使用jquery !!

感谢!!!

Answer 1

this.commentDialog = function(){
        // save a reference of "this" and use it later.
        var me = this;

        $("#commentDialog").dialog( "destroy" );
        html = "<div id='cmtDialog'>";
        html += "Comment<textarea id='comment'></textarea></div>";
        $("#commentDialog").html(html);
        $("#commentDialog").dialog({
            title:"Search Result",
            bgiframe: true,
            height: 'auto',
            width: 'auto',
            modal: true,autoOpen: true,
            buttons: { "Ok": function() { 
                 // use me instead of this, as this now refers to the function.
                 me.saveComment();}}
            });

Answer 2

这里不需要另外的引用，只需直接引用函数"Ok"绑定，如下所示：

this.commentDialog = function(){
    $("#commentDialog").dialog( "destroy" );
    html = "<div id='cmtDialog'>";
    html += "Comment<textarea id='comment'></textarea></div>";
    $("#commentDialog").html(html);
    $("#commentDialog").dialog({
        title:"Search Result",
        bgiframe: true,
        height: 'auto',
        width: 'auto',
        modal: true,autoOpen: true,
        buttons: { "Ok": this.saveComment }
    });
};

这样你就不会进入另一个匿名函数，其中this是一个不同的上下文。

Answer 3

在Ok回调中，this并非您认为的那样。

您需要保存对原始this的引用。

this.commentDialog = function() {
        var html = "<div id='cmtDialog'>Comment<textarea id='comment'></textarea></div>";
        var me = this;          //Save the original this
        $("#commentDialog")
            .dialog( "destroy" )
            .html(html);
            .dialog({
                title:"Search Result",
                bgiframe: true,
                height: 'auto',
                width: 'auto',
                modal: true,autoOpen: true,
                buttons: { "Ok": function() { me.saveComment(); } }
            });
};