SAPUI5：在将数据推送到OData服务时如何显示加载对话框？

Question

我在不追求任何模板方法的情况下构建新的SAPUI5应用程序。 我正在构建的只是一个带有两个字段和一个按钮的小表格。 AHHhh ...“按钮”。

那按钮呢？ 该按钮具有以下代码：

<Button text="OK" width="100%" id="__button1" press="insertIntoOData"/>

function is called. 这样，我希望当我按下按钮时，将函数。 你猜怎么着！？ 它是！

太棒了！

I want it to show a dialog (which is built with a fragment - check this link ) while the OData model handles the insertion of a record. 但是问题是，在OData模型处理记录的插入时，我希望在中显示一个对话框（由片段构建-检查此链接 ）。 不幸的是，我没有设法显示该对话框。 function is called synchronously, and won't show the dialog until the function is done. 看起来函数是被同步调用的，直到该函数完成后才显示对话框。

, the navigation is redirected to the master (main) page. 当OData Model完成插入操作时，将处理响应，并且仅显示一会儿对话框，因为您可能会在以下代码中 ，导航被重定向到母版（主）页面。

insertIntoOData: function(evt) {

    /* 
    * to prevent namespace issues, reserve 'this' into 'that',
    * so the ajax will know who to call inside its scope
    */
    var that = this;

    //declare the dialog
    if (!that._dialog) {
        that._dialog = sap.ui.xmlfragment("valac.view.requestloading", null);
        that.getView().addDependent(that._dialog);
    }

    // open dialog
    jQuery.sap.syncStyleClass("sapUiSizeCompact", that.getView(), that._dialog);
    that._dialog.open();


    // get the csrf token from the service url
    var csrfToken = this.getCSRFToken("/valacDestination/sap/c4c/odata/v1/c4codata/ValacObjectCollection");

    // get the values from the 'form'
    var name_var = this.byId("tSubjectInput").getValue();
    var description_var = this.byId("tDescriptionArea").getValue();

    // create the entry that will be sent with the request
    var oEntry = {};

    // the description list
    oEntry.requestDescription = [];

    // the description item that goes inside the list
    var entryOfRequestDescription = {};
    entryOfRequestDescription.Text = description_var;
    oEntry.requestDescription.push(entryOfRequestDescription);

    // name is a complex object that needs to be built. Content and language.
    oEntry.Name = {};
    oEntry.Name.content = name_var;
    oEntry.Name.languageCode = "EN";

    // fetch the model schema
    var oModel = new sap.ui.model.odata.ODataModel("/valacDestination/sap/c4c/odata/v1/c4codata/");

    sap.ui.getCore().setModel(oModel);

    /* create the entry into the model schema via ajax
    * return to the master page if there's a success response
    * put a message on the master page.
    */
    oModel.create('/ValacObjectCollection', oEntry, null, function(response){
        that._dialog.close();
        sap.ui.core.UIComponent.getRouterFor(that).navTo("master");     
        sap.m.MessageToast.show("Object Persisted!", {
            duration: 30000000
        });
    },function(){
        that._dialog.close();
        sap.m.MessageToast.show("ERROR!", {
            duration: 30000000
        });
    });
}

ends or calls the function? 我的问题是： 如何在结束或调用函数之前显示对话框？

Answer 1

当您输入insertIntoOData方法时。 致电服务之前

  that._dialog.setBusy(true);

获得服务响应后（成功或错误无关紧要）设置为

that._dialog.setBusy(false);

Answer 2

您可以执行全局繁忙指示器或组件繁忙指示器，在oModel.create之前oModel.create并隐藏到成功或错误函数中：

sap.ui.core.BusyIndicator.show(0); <- Parameter is delay time.

sap.ui.core.BusyIndicator.hide();  <- hide

链接文档： https : //sapui5.hana.ondemand.com/1.44.18/explored.html#/sample/sap.ui.core.sample.BusyIndi​​cator/preview

仅对话框显示繁忙。

that._dialog.setBusy(true); <- Show

that._dialog.setBusy(false); <- hide

Answer 3

我设法显示了busyIndi​​cator。 我重建了insertIntoOData函数，如下所示：

    insertServiceRequestIntoOData: function(evt) {

        var that = this;
        var token = null;
        var serviceUrl = "URL";

        var name_var = this.byId("tSubjectInput").getValue();
        var description_var = this.byId("tDescriptionArea").getValue();

        var oEntry = {};
        /*
         * oEntry building process omitted
         */

        this.oModel = new sap.ui.model.odata.ODataModel(serviceUrl);
        sap.ui.getCore().setModel(this.oModel);

        /*
         * This is where the magic happens:
         * 1) ajax async request to get the token and to show the busy indicator on the screen
         * 2) when it's over, make a post to the oData service with the data.
         * 3) when it's over, hide the busy indicator and go to the correct page (success or error).
         */
        $.ajax({
            url: serviceUrl + "/MyCollection";
            type: "GET",
            async: true,
            beforeSend: function(xhr) {
                sap.ui.core.BusyIndicator.show(0);
                xhr.setRequestHeader("X-CSRF-Token", "Fetch");
            },
            complete: function(xhr) {
                token = xhr.getResponseHeader("X-CSRF-Token");

                // begin of odata send
                that.oModel.create("/MyCollection", oEntry, null, function(response){
                    sap.ui.core.BusyIndicator.hide();
                    sap.ui.core.UIComponent.getRouterFor(that).navTo("insertConfirmation"); 
                    that.clearInputs();

                    },function(){
                        sap.ui.core.BusyIndicator.hide();
                        sap.ui.core.UIComponent.getRouterFor(that).navTo("insertErrorConfirmation");    
                        that.clearInputs();
                });

            }
        });
    }