Question

我有一个JSONEditor npm包的绑定处理程序。我的程序将使用户能够比较这些面板中的两个不同的JSON文件。我的bindingHandler看起来像这样：

var editor = undefined;
ko.bindingHandlers.jsoneditor = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        const options = {
            "mode" : "view"
        };
        const value = ko.utils.unwrapObservable(valueAccessor());

        if(!editor) {
            editor = new JSONEditor(element, options);
            editor.set(value);
        }
        else if(element !== editor.container){
            editor = new JSONEditor(element, options);
            editor.set(value);
        }
    },
    update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {

        const options = {
            "mode" : "view"
        };
        const value = ko.utils.unwrapObservable(valueAccessor());

        if(element === editor.container){
            editor.destroy();
            editor = new JSONEditor(element, options);
            editor.set(value);
        }
        else {
            //editor.set(value);
            editor = new JSONEditor(element, options);
            editor.destroy();
        }

    }
};

问题是，每当我切换面板时，element都会发生变化，并使用编辑器创建错误。

这是HTML：

<div class="jsoneditor body" id="editor-1" data-bind="jsoneditor: subject1"></div>
<div class="jsoneditor body" id="editor-2" data-bind="jsoneditor: subject2"></div>

Answer 1

首先，摆脱处理程序外部的编辑器变量-不酷。您不想要共享实例，您想要的是让一个处理程序一次管理2个编辑器实例，每个JSON文件一个

ko.bindingHandlers.jsoneditor = {
    init: function (element, valueAccessor, allBindings, viewModel, bindingContext) {
        const options = {
            "mode" : "view"
        };
        const files = valueAccessor();
        const editors = [];

        files.forEach(f =>{
        // create a new element for each subject
        // and append to dom 
        // attach an editor to each created element
        // set your new value 
        var $currentElem = $('<div>');           
        $(element).append($currentElem);                
        editors.push(new JSONEditor($currentElem, options));      
        editors[editors.length-1].set(f); 
        });

    },
    update: function (element, valueAccessor, allBindings, viewModel, bindingContext) {    
    }
};




<div class="EditorContainer" id="Editor_SmUniqueThingy" data-bind="jsoneditor: { file1: subject1, file2: subject2 }"></div>

这不是一个可行的示例，我完全省略了更新，但是这个概念是...在处理程序中传递2个主题和每个选项可能需要的任何选项，然后在处理程序中传递：

创建将包含编辑器的2个div
从传入的valueAccessor数据中设置其值
通过事件等对它们进行管理

如何两次使用bindingHandler

1 个答案: