如何在dynatree上强制执行同步模式? [英] How can I force sync mode on dynatree?

问题描述

我正在使用Martin Wendt的 Dynatree ，并希望在Ajax中动态，动态地更新树递归地.

I'm using Martin Wendt's Dynatree and want to update the tree in Ajax, dynamically and recursively.

为此，我正在使用tree.getNodeByKey(nodes[i-1]).appendAjax({});之类的函数 和tree.activateKey(nodes[i]);在for循环中.

For this, I'm using functions like tree.getNodeByKey(nodes[i-1]).appendAjax({}); and tree.activateKey(nodes[i]); in a for loop.

将alert("Hello world");添加到循环中时，我的代码可以在95％的时间内正常工作.没有它，代码将永远无法工作.

When adding alert("Hello world"); into the loop, my code works correctly 95% or the time. Without it, the code never works.

问题显然来自于 Dynatree正在以异步模式执行其Ajax请求，并且在添加到.initAjax和/或.appendAjax时似乎忽略了async:false:

The problem is obviously coming from the fact that Dynatree is performing its Ajax requests in asynchronous mode, and seem ignoring the async:false, when added to .initAjax and/or .appendAjax:

        jQuery('#tree').dynatree("getTree").getNodeByKey(nodes[i-1]).appendAjax({
        type: 'POST',
        url: "inc/treeNodes.php",
        dataType: 'json',
        data: {key: nodes[i]},
        async:false
        });

我尝试在对.appendAjax的调用周围添加setTimeout (function() {},2000);，但是它阻止了此方法的工作.

I tried adding setTimeout (function() {},2000); around the call to .appendAjax, but it prevented this method to work.

可以将Dynatree修改为支持异步模式吗?

Could Dynatree be modified to support asynchronous mode?

推荐答案

尽管它不能真正回答在同步模式下运行Dynatree的问题，但我发现了一个解决方法，它几乎可以模拟Ajax同步行为

Although it does not truly answer the question of running Dynatree in synchronous mode, I found a workaround that almost emulates an Ajax synchronous behavior.

以下变通办法似乎在localhost上可以正常运行，但是如果站点是远程的则不能.

the following workaround seems working reasonably well on localhost, but not if the site is remote.

在对Dynatree方法进行重要调用之前，请添加一个setTimeOut()调用，最后将一些内容写入控制台.

Before important calls to Dynatree's method, add a setTimeOut() call at the end of which something will be written to the console.

   for (i=1; i < n; i++) {
        (...)
        setTimeout(function(){console.log('_')}, 3000);  
        jQuery('#tree').dynatree("getTree").getNodeByKey(nodes[i-1]).appendAjax({...});
        (...)
    }

setTimeout不会像延迟所建议的那样使代码变慢. 例如，如果循环具有三个迭代，则不必等待9秒(3x 3000)就可以完成所有三个appendAjax调用所完成的工作. 我假定.appendAjax()调用是在setTimeout仍在运行的同时执行的，但是后面的调用似乎对文档窗口产生了神奇的效果.

The setTimeout does not slower the code as much as the delay would suggest. For instance, if the loop has three iterations, you don't have to wait 9 seconds (3x 3000) before the work done by all three appendAjax calls complete. I assume that .appendAjax() calls are performed whilst setTimeout is still running, but the later seem having some magic effect on the document window.

使用setTimeout和触发器console.log()与插入alert();调用具有相似的效果，但是对于访问者来说是无声的".

Using setTimeout and trigger console.log() has similar effect as inserting alert(); calls, but is "silent" for the visitor.

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