我在我的 Fiori/UI5 应用程序上实现了一个扫描仪按钮。我sap.ndc.BarcodeScannerButton在控制器上使用并创建了该按钮（我似乎无法在我的 view.xml 上创建按钮）。
无论如何，我需要在视图加载后触发这个按钮。我有一个主从应用程序。扫描仪按钮当然在主视图上。
我做的第一件事就是调用按钮本身。但我的第一个问题是按钮不接受 id 作为参数。它告诉我应用程序不能接受重复的 id。所以我所做的只是寻找按钮ID。我能够找到它（例如_button9），但每当我通过它调用它时sap.ui.getCore.byId()，它有时会返回“未定义”。这就是为什么我不能打电话firePress()；
我遇到的另一个问题是把这个firePress()方法放在哪里。我试图把它放在方法上，onAfterRendering()假设由于未定义的按钮我无法调用该方法firePress()。我尝试将其放在其他方法上，例如在使用 method 成功调用数据之后attachRequestCompleted。没运气。
下面是代码
/*
* Copyright (C) 2009-2014 SAP SE or an SAP affiliate company. All rights reserved
*/
jQuery.sap.require("sap.ca.scfld.md.controller.ScfldMasterController");
jQuery.sap.require("ui.s2p.srm.sc.create.util.Formatter");
jQuery.sap.require("sap.ndc.BarcodeScannerButton");
var counter = 0;
sap.ui.controller("ui.s2p.srm.sc.create.SRM_SC_CREExtension.view.S2Custom", {
onInit: function() {
sap.ca.scfld.md.controller.ScfldMasterController.prototype.onInit.call(this);
this.oBundle = this.oApplicationFacade.getResourceBundle();
this.isRoot = true;
this.oRouter.attachRouteMatched(function(e) {
if (e.getParameter("name") === "master" && !this.isRoot && Object.keys(e.getParameter("arguments")).length === 0) {
var d = sap.ui.core.routing.History.getInstance().getDirection("shoppingCartCheckout/" + this.tempCartId);
if (d === "Unknown") {
this.isRoot = true;
this._oControlStore.oMasterSearchField.clear()
} else {
if (this.getList() !== null) {
var i = this.getList().getSelectedItem();
if (i !== null) {
//alert("setListGo");
this.setListItem(i);
}
}
}
}
this.isRoot = (this.isRoot) ? false : this.isRoot;
}, this);
// alert(sap.ui.getCore().byId("productScanButton"));
this.onBarcodeScanning();
this.setEmptyCart(true);
this.showAllProducts(); //added by salduam to show all products
},
backToList: function() {
//alert("back");
},
getDefaultUserSettings: function(r) {
var o = function(D, R) {
this.tempCartId = D.results[0].TEMP_CART_ID;
if (!jQuery.device.is.phone) {
if (r) {
this.oRouter.navTo("noData", {
viewTitle: "DETAIL_TITLE",
languageKey: "NO_ITEMS_AVAILABLE"
}, true)
} else {
this.navToEmptyView()
}
}
};
var d = this.oApplicationFacade.getODataModel("getdefusrset");
d.read("DefaultUserSettings?ts=" + Date.now(), null, null, true, jQuery.proxy(o, this), jQuery.proxy(this.onRequestFailed, this))
},
applySearchPatternToListItem: function(i, f) {
if (f.substring(0, 1) === "#") {
var t = f.substr(1);
var d = i.getBindingContext().getProperty("Name").toLowerCase();
return d.indexOf(t) === 0
} else {
return sap.ca.scfld.md.controller.ScfldMasterController.prototype.applySearchPatternToListItem.call(null, i, f)
}
},
getHeaderFooterOptions: function() {
var o = {
sI18NMasterTitle: "MASTER_TITLE",
buttonList: []
};
return o
},
isBackendSearch: function() {
return true
},
//call startReadListData with parameter wildcard
showAllProducts: function(e) {
var startSearchText = "*";
this.startReadListData(startSearchText);
//alert("called");
},
applyBackendSearchPattern: function(f, b) {
//added by salduam
//if search field is blank, automatically call showAllProducts
if (f == "") {
this.showAllProducts()
};
if (f != "" && f != null) {
this.startReadListData(f)
} else {
this.setEmptyCart(false)
}
},
startReadListData: function(f) {
var o = function(D, r) {
var m = new sap.ui.model.json.JSONModel(D.results);
this.getView().setModel(m);
this.getList().destroyItems();
this.getList().bindAggregation("items", {
path: "/",
template: this.oTemplate.clone(),
filter: [],
sorter: null
});
this.registerMasterListBind(this.getList());
};
var e = encodeURIComponent(f);
//console.log("EEEE-----"+ e);
var d = this.oApplicationFacade.getODataModel();
//console.log(d);
d.read("CATALOG_ITEM?$filter=startswith(description,'" + e + "')&$top=20", null, null, true, jQuery.proxy(o, this), jQuery.proxy(this.onRequestFailed,
this));
},
setListItem: function(i) {
// alert("onClick");
var b = i.getBindingContext();
var m = b.oModel.oData[parseInt(b.sPath.split('/')[1])];
this.oRouter.navTo("detail", {
tempCartId: this.tempCartId,
contextPath: b.getPath().substr(1)
}, true);
var c = sap.ui.core.Component.getOwnerIdFor(this.oView);
var C = sap.ui.component(c);
C.oEventBus.publish("ui.s2p.srm.sc.create", "refreshDetail", {
data: m
});
},
setEmptyCart: function(r) {
var e = new sap.ui.model.json.JSONModel({
results: []
});
this.oRouter.navTo("noData", {
viewTitle: "DETAIL_TITLE",
languageKey: "NO_ITEMS_AVAILABLE"
}, true);
this.getView().setModel(e);
this.oTemplate = new sap.m.ObjectListItem({
type: "{device>/listItemType}",
title: "{matnr}",
press: jQuery.proxy(this._handleItemPress, this),
number: "{parts:[{path:'itm_price'},{path:'itm_currency'}],formatter:'ui.s2p.srm.sc.create.util.Formatter.formatPrice'}",
numberUnit: "{itm_currency}",
attributes: [new sap.m.ObjectAttribute({
text: "{description}"
})],
});
this.getList().bindAggregation("items", {
path: "/results",
template: this.oTemplate,
filter: [],
sorter: null,
});
this.registerMasterListBind(this.getList());
this.getDefaultUserSettings(r)
},
onRequestFailed: function(e) {
jQuery.sap.require("sap.ca.ui.message.message");
sap.ca.ui.message.showMessageBox({
type: sap.ca.ui.message.Type.ERROR,
message: e.message,
details: e.response.body
})
},
onExit: function() {},
onBarcodeScanning: function(oEvent) {
var productScanButton = new sap.ndc.BarcodeScannerButton({
provideFallback: "{/btnFallback}",
width: "100%",
scanSuccess: function(oEvent) {
var barcodeID = oEvent.getParameter("text");
sap.m.MessageToast.show(barcodeID);
var searchField = sap.ui.getCore().byId("__field3");
searchField.setValue(barcodeID);
searchField.fireSearch();
}
});
this.getView().byId("barCodeVBox").addItem(productScanButton);
},
onAfterRendering: function(oEvent) {},
onBeforeRendering: function() {}
});