推迟 Dojo Deferred

Posted 2023-02-16

【中文标题】推迟 Dojo Deferred

【英文标题】：Deferring a Dojo Deferred

【发布时间】：2013-02-06 14:17:08

【问题描述】：

我在从小部件中的方法获取延迟返回时遇到了一点问题。该方法本身返回一个 Deferred，因为它是一个 xhrPost。代码就是这样（使用dojo 1.8）

调用代码：

quorum = registry.byId("quorumPanel");

var deferredResponse = quorum.updateSelectionCount();

deferredResponse.then(function(data)
    console.log("Success: ", data);
, function(err)
    console.log("Error: ", err);
);

以及小部件中的代码：

updateSelectionCount: function() 

    var self = this;

    var deferredResponse = xhr.post(
        url: "ajxclwrp.php",
        content: [arguments here],
        handleAs: "json");

    deferredResponse.then(function(response) 

    var anotherDeferred = new Deferred();

        var _boolA = true;
        var _boolB = true;
        dojo.forEach(response.result, function(relationshipInfo)
            [do a bunch of stuff here too set _boolA and/or _boolB]
        );

        self._sethasRequiredAttr(_hasRequired);
        self._setHasRequestedAttr(_hasRequested);
        self.quorumInfo.innerhtml = quorumHtml;

        // Below is not working 
        anotherDeferred.resolve('foo');
        return anotherDeferred;

    );

我是否需要设置另一个 promise 并使用 promise/all.我在这一点上感到困惑/沮丧。

TIA。

【参考方案1】：

.then() 方法返回另一个延迟。你只需要在里面放一个return语句。

updateSelectionCount: function() 

    var self = this;

    var deferredResponse = xhr.post(
        url: "ajxclwrp.php",
        content: [arguments here],
        handleAs: "json");

    return deferredResponse.then(function(response) 

        var _boolA = true;
        var _boolB = true;
        dojo.forEach(response.result, function(relationshipInfo)
            [do a bunch of stuff here too set _boolA and/or _boolB]
        );

        self._sethasRequiredAttr(_hasRequired);
        self._setHasRequestedAttr(_hasRequested);
        self.quorumInfo.innerHTML = quorumHtml;

        return "foo";
    );