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Filter Options in Select Field

假设有两个下拉字段State和City。邦有两个值卡纳塔克邦和马哈拉施特拉邦，城市有四个值，班加罗尔，迈索尔，孟买和浦那。如果希望根据State中选择的值过滤City中的选项，可以编写如下所示的自定义脚本。

frappe.ui.form.on("Lead", "state", function(frm) {if(frm.doc.state == "Karnataka"){set_field_options("city", ["Bangalore","Mysore"])}else if(frm.doc.state == "Maharashtra"){set_field_options("city", ["Mumbai","Pune"])}else if(frm.doc.state == ""){set_field_options("city", ["","Bangalore","Mysore","Mumbai","Pune"])}});