在ngx-formly中使用hideExpression的语法错误

如何解决在ngx-formly中使用hideExpression的语法错误

我创建了一个组件，以允许用户构建调查表。目标是将提供的所有信息存储到FormlyFieldConfig中，然后将其另存为JSON到数据库中。满足期望条件时将生成问卷。然后，我将JSON解析为FormlyFieldConfig，以显示为表单。

我遇到的问题与“ hideExpression”有关。如果问题的类型为“选择”，则其选项中可能还有其他后续问题。表单会很好地保存，以防出现以下错误；

期望的表达式，得到'！=='

这是我创建hideExpression的方法：

hideExpression: 'model.' + keyvalue + ' !== ' + '"' + this.answerOptions[i].option + '"'

此功能的完整代码：

private getEditedQuestion(): FormlyFieldConfig {
    const formModel = this.questionProfileForm.value;

    var fieldConfig: FormlyFieldConfig = {};

    // Here,we set the key using the questionLabel value without spaces
    var keyvalue = formModel.questionLabel.replace(/\s/g,"")

    // We start our field config with a 'CardWrapper'. Then,nest the fields in a field group
    fieldConfig.wrappers = ['CardWrapper'];
    fieldConfig.fieldGroupClassName = 'display-flex-column';
    fieldConfig.fieldGroup = [
        {
            key: keyvalue,type: formModel.answerType.type,templateOptions: {
                label: formModel.questionLabel
            }
        }
    ]

    switch (formModel.answerType.type) {
        case 'input':
            fieldConfig.fieldGroup[0].templateOptions.type = formModel.answerType.secondaryType;
            switch (formModel.answerType.secondaryType) {
                case 'text':
                    fieldConfig.fieldGroup[0].templateOptions.minLength = formModel.answerMinLength || 2;
                    fieldConfig.fieldGroup[0].templateOptions.maxLength = formModel.answerMaxLength || 100;
                    break;
                case 'number':
                    fieldConfig.fieldGroup[0].templateOptions.min = formModel.answerMinNumber || 1;
                    fieldConfig.fieldGroup[0].templateOptions.max = formModel.answerMaxnumber || 1000000;
                    break;
                default:
                    break;
            }
            break;
        case 'textarea':
            fieldConfig.fieldGroup[0].templateOptions.maxLength = formModel.answerTextAreaMaxLength || 2000;
            fieldConfig.fieldGroup[0].templateOptions.cols = formModel.answerTextAreaColumns || 100;
            fieldConfig.fieldGroup[0].templateOptions.rows = formModel.answerTextAreaRows || 3;
            break;
        case 'select':
            // If the answer type is set to 'select' and answerOptions have actual values,we need to add them to the field group of the current fieldConfig
            if (this.answerOptions.length > 0) {
                var optionsArray: any[] = [];

                // Loop through the answerOptions and push them to an array
                for (var i = 0; i < this.answerOptions.length; i++) {
                    optionsArray.push({ label: this.answerOptions[i].option,value: this.answerOptions[i].option });

                    // If the answerOption has a subquestion(s),we need to build additonal field configs to be displayed when the answerOption value is selected
                    if (this.answerOptions[i].hasSubQuestion && this.answerOptions[i].subQuestions?.length > 0) {
                        var fieldArray: FormlyFieldConfig[] = [];

                        // Loop through the subQuestions,create fieldConfig objects for each,and push to a fieldConfig array
                        for (var j = 0; j < this.answerOptions[i].subQuestions.length; j++) {
                            var subkeyvalue = this.answerOptions[i].subQuestions[j].question.replace(/\s/g,"");

                            var subFieldConfig: FormlyFieldConfig = {
                                key: subkeyvalue,type: this.answerOptions[i].subQuestions[j].inputType.type,templateOptions: {
                                    type: this.answerOptions[i].subQuestions[j].inputType.secondaryType ? this.answerOptions[i].subQuestions[j].inputType.secondaryType : '',label: this.answerOptions[i].subQuestions[j].question,description: this.answerOptions[i].option
                                },hideExpression: 'model.' + keyvalue + ' !== ' + '"' + this.answerOptions[i].option + '"'
                            };

                            if (this.answerOptions[i].subQuestions.length > 1) subFieldConfig.className = 'child-flex-grow';

                            fieldArray.push(subFieldConfig);
                        }

                        var fieldConfigRow: FormlyFieldConfig = {};
                        fieldConfigRow.fieldGroupClassName = 'display-flex-row';
                        fieldConfigRow.fieldGroup = fieldArray;
                        fieldConfig.fieldGroup.push(fieldConfigRow);
                    }
                }

                fieldConfig.fieldGroup[0].templateOptions.options = optionsArray;
            }
        default:
            break;
    }

    return fieldConfig;
}

错误从formly library中的以下位置发生；第121行；