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IsRequired

检查当前表单是否为必填项。

继承自 ApiFormBase.IsRequired。

语法​

expression.IsRequired();

expression - 表示 ApiComboBoxForm 类的变量。

参数​

此方法没有任何参数。

返回值​

boolean

示例​

验证文档中的组合框表单是否被标记为必填。

// How do I check if a combo box form must be filled out before submitting a document?

// Read the required flag on a form field to enforce completion rules in a document.

let doc = Api.GetDocument();
let comboBoxForm = Api.CreateComboBoxForm({"key": "Personal information", "tip": "Choose your country", "required": true, "placeholder": "Country", "editable": false, "autoFit": false, "items": ["Latvia", "USA", "UK"]});
let paragraph = doc.GetElement(0);
paragraph.AddElement(comboBoxForm);
let required = comboBoxForm.IsRequired();
paragraph = Api.CreateParagraph();
paragraph.AddText("The first form from this document is required: " + required);
doc.Push(paragraph);