Question

我有一个应用程序，页面生成器创建一个保存在数据库中的起始页面。保存的信息只是DOM对象的outerHTML。要创建编辑功能，我需要一个从HTML信息中重新创建DOM对象的反函数。不幸的是，将解密的信息分配给outerHTML部分不会产生任何结果，因为忽略了DOM对象中的更改。

我的问题：如何从保存的outerHTML信息中重新创建DOM对象？如果这是不可能的，那么做这样的事情的正确方法是什么？

修改谢谢您的回复！以下是一些显示我正在做的代码片段。原型 MainWidget 正在从HTML页面获取信息。想要分配信息。使用的函数是另一个名为 Widgets 的对象（原型）的一部分。

var asserts = new Asserts();
var calls = new Calls();
var constants = new MainConst();
var strings = new Strings();
var widgets = new MainWidget();

MainWidget.method('assign2Widget', function (call, label, value, isValid) {
    isValid = toBoolean(isValid), value = strings.toString(value);

    if (calls.isValid(call) && strings.hasMinimalLength(label, 2)) {
        var section = (!label.includes('Builder')  // A marker, not an element!
                        && !label.includes(constants.NewsTicker))
            ? widgets.getSgSectionByLabel(document, label)
            : null;
        value = strings.decode(decodeURIComponent(value));      //<<<< Code decoded from DB

        if (asserts.isObject(section)) {
            section.outerHTML = value;
        } else if (label.includes(constants.Elements)) {
            if (asserts.isValid(infos.Elements) && infos.Elements.length > 0) {
                // HERE, THE CODE FROM DB SHOULD BE ADDED TO WIDGET.
                // The "label" gives the label of the widget, and the "value" is
                // what is to be assigned to.
            }
        } else if (label.includes(constants.NewsTicker)) {
            […]
        }
        […]
});

Widget.method('getElementTypeByLabel', function (thing, elementType, label) {
    if (asserts.isObject(thing)
        && strings.hasMinimalLength(elementType, 2)
        && strings.hasMinimalLength(label, 2)) {

        var element, elements = document.getElementsByTagName(elementType);

        if (asserts.isValid(elements)
            && asserts.isDefined(elements.length) && elements.length === 0) {

            elements = thing.children;
        }
        for (var i = 0; asserts.isDefined(elements.length) && i < elements.length; i++) {
            element = elements*;

            if (element.getAttribute !== null) {
                var labelName = element.getAttribute(constants.label);

                if (label === labelName && element !== null) {
                    return element;
                }
            } else {
                return null;
            }
        }
        // If the element was not found, search recursively the elements!
        for (var i = 0; asserts.isDefined(elements.length) && i < elements.length; i++) {
            return this.getElementTypeByLabel(elements*, elementType, label);
        }
    } else {
        // Error! //messages.invalidFunctionCall(functionName);
    }
    return null;
});

Widget.method('getSgSectionByLabel', function (element, label) {
    return this.getElementTypeByLabel(element, 'sg-section', label);
});

编辑2 ：我在编辑现有页面时仅使用sg-section中所做的更改来重新创建内容。

MainWidget.js:
[…]
MainWidget.method('assign2Widget', function (call, label, value, isValid) {
    isValid = toBoolean(isValid), value = strings.toString(value);

    if (calls.isValid(call) && strings.hasMinimalLength(label, 2)) {
        var section = (!label.includes('Builder')  // A marker, not an element!
                        && !label.includes(constants.NewsTicker))
            ? widgets.getSgSectionByLabel(document, label)
            : null;
        value = strings.decode(decodeURIComponent(value));

        if (asserts.isObject(section)) {
            section.outerHTML = value;
        } else if (label.includes(constants.Elements)) {
            if (asserts.isString(value) && value.includes(LeftBracket)) {
                value = arrays.toArray(value);  //value.replace(LeftBracket, '').split(RightBracket);
            }
            if (arrays.isArray(value)) {
                for (var i = 0; i < value.length; i++) {
                    infos.insertGridItem(value[i]);
                }
            }
            […]

MainInfos.js:
[…]
function MainInfos() {
    this.Elements;                      // Object for startGridGenerator
    this.insertGridItem;                // Function of startGridGenerator
    this.PrototypeName = 'MainInfos';
}

MainInfos.inherits(Infos);

MainWidget.method('assign2Widget', function (call, label, value, isValid) {
    isValid = toBoolean(isValid), value = strings.toString(value);

    if (calls.isValid(call) && strings.hasMinimalLength(label, 2)) {
        var section = (!label.includes('Builder')  // A marker, not an element!
                        && !label.includes(constants.NewsTicker))
            ? widgets.getSgSectionByLabel(document, label)
            : null;
        value = strings.decode(decodeURIComponent(value));

        if (asserts.isObject(section)) {
            section.outerHTML = value;
        } else if (label.includes(constants.Elements)) {
            if (asserts.isString(value) && value.includes(LeftBracket)) {
                value = arrays.toArray(value);  //value.replace(LeftBracket, '').split(RightBracket);
            }
            if (arrays.isArray(value)) {
                for (var i = 0; i < value.length; i++) {
                    infos.insertGridItem(value[i]);
                }
            }
        } else if (label.includes(constants.NewsTicker)) {
            […]
        }
});

startGridGenerator.js:
[…]
(function () {
    var moduleName = 'ivmGridBuilder';

    var controllerName = moduleName + Controller;

    angular.module(moduleName, [
        'ionic',
        'ui.sortable',
        'ivmColorpicker',
        'ivmIconpicker'
    ])
        .controller(controllerName, function ($scope,
                                              $ionicScrollDelegate,
                                              $ionicModal,
                                              $sce,
                                              CommunicationService) {
            […]
            /**
             * Inserts an existing grid item to the item's array
             *
             * @param item
             */
            $scope.insertGridItem = function (item) {
                if (asserts.isObject(item)) {
                    $scope.items.push(item);
                    infos.Elements.push(item);
                    $ionicScrollDelegate.resize()
                } else {
                    // First call with no valid item & "remember" this function
                    // by having a link to in in object MainInfos!
                    infos.insertGridItem = $scope.insertGridItem;
                }
            };

Answer 1

您可以使用DOMParser()创建#document或<template>元素，以便从字符串中创建#document-fragment

const parser = new DOMParser();
const doc = parser.parseFromString(/* outerHTML */, "text/html");

Answer 2

您可以将字符串添加到隐藏的Div in页面中，然后使用javascript获取您想要从该Div中获取的元素。就像在这段代码中一样：

var str ='abc 123<div id="test">coursesweb.net</div><span class="cls">some text</span>';
document.querySelector('body').insertAdjacentHTML('beforeend', '<div style="display:none;">'+str+'</div>');
var ob_test = document.getElementById('test');
alert(ob_test.innerHTML);

Answer 3

解决方案应该是，你得到一个包含内容的HTML字符串。然后使用$sce.trustAsHtml();并分配一个范围变量，该变量将确保HTML是安全的，然后您可以使用下面带有指令ng-bind-html的HTML将HTML字符串呈现为实际HTML。

这是一个相同的工作示例。

var app = angular.module("angularApp", []);
app.controller("appController", function($scope, $sce) {
  $scope.content = "This text is <em>html capable</em> meaning you can have <a href=\"#\">all</a> sorts <b>of</b> html in here.";
  $scope.output = $sce.trustAsHtml($scope.content);
});

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<h2>Rendering HTML with angularJS</h2>
<div ng-app="angularApp" ng-controller="appController">
  <div ng-bind-html="output"></div>
</div>

另一种选择是使用ng-sanitize。

如果使用ng-sanitize - 通过将HTML解析为标记来清理输入。然后将所有安全令牌（来自白名单）序列化为正确转义的html字符串。这意味着没有不安全的输入可以使它成为返回的字符串。

请参阅以下问题以获得更详细的解释。

SO Answer

var app = angular.module("angularApp", ['ngSanitize']);
app.controller("appController", function($scope) {
  $scope.content = "This text is <em>html capable</em> meaning you can have <a href=\"#\">all</a> sorts <b>of</b> html in here.";
});

<script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.6/angular.min.js"></script><script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.6.6/angular-sanitize.min.js"></script>
<h2>Rendering HTML with angularJS</h2>
<div ng-app="angularApp" ng-controller="appController">
  <div ng-bind-html="content"></div>
</div>

如上例所示，无需拨打$sce.trustAsHtml();，因为ngSanitize会自动处理。

请告诉我这种方法是否对您有所帮助，或者您是否遇到任何问题！

如何使HTML文本成为DOM对象

3 个答案: