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我试图调用一个我知道存在于变量上的函数，但由于某种原因，我无法从传递的函数中调用onUpdate- 任何想法家伙 - 抱歉新手

//set up the mirror when view is expanded
function attachMirrorListener(section, mirror) {
    var textarea = document.getElementById(mirror.attr('id'));
    var input = $(mirror.data('input'));
    var myCodeMirror;
    section.click(function() {
        if(section.hasClass('open') && !section.hasClass('mirror-added')) {
            section.addClass('mirror-added');

            input.attr('value','test value!!');
            myCodeMirror = CodeMirror.fromTextArea(textarea, {
                onUpdate : function(){ myCodeMirror.save(); //does not work here!!
                    },
            });

        }
        console.log(myCodeMirror);
        myCodeMirror.save(); //works here
    });


}
});

更新

我尝试重新排列代码，仍然无法正常工作

jQuery(document).ready(function($) {
    var _codeMirror;
    //setup code-mirror
    $('.customize-section').each(function() {
        var section = $(this);
        var mirror = section.find('textarea.wpec-tc-code-mirror');
        if(mirror.length > 0) {
            attachMirrorListener(section, mirror);
        }
    });
    //set up the mirror when view is expanded
    function attachMirrorListener(section, mirror) {
        var textarea = document.getElementById(mirror.attr('id'));
        var input = $(mirror.data('input'));

        section.click(function() {
            if(section.hasClass('open') && !section.hasClass('mirror-added')) {
                section.addClass('mirror-added');
                _codeMirror = CodeMirror.fromTextArea(textarea, {
                    onUpdate : codemirrorcallback,
                });

            }
        });
        function codemirrorcallback() {
            _codeMirror.save();
            input.val(escape(textarea.value));
        }

    }

});

这是来自 chrome 控制台的错误日志

Uncaught TypeError: Cannot call method 'save' of undefined codemirror.js:26 codemirrorcallback codemirror.js:26 endOperation codemirror.js:1864 instance.(anonymous function) codemirror.js:1871 CodeMirror codemirror.js:95 CodeMirror.fromTextArea codemirror.js:2114 (anonymous function) codemirror.js:19 f.event.dispatch load-scripts.php:3 f.event.add.h.handle.i

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1 回答 1

0

赋值运算符从右到左工作。所以，当你第一次调用myCodeMirror.save()时，myCodeMirror仍然是未定义的。

var myCodeMirror; //undefined

myCodeMirror = CodeMirror.fromTextArea(textarea, {
    onUpdate : function() { 
        myCodeMirror.save(); //still undefined 
    }
});

相反，您应该this.save()从内部 onUpdate 函数中调用。

于 2012-06-11T08:25:09.590 回答