英文:
SvelteKit navigation issue: client-side change detection not working
问题
我正在使用SvelteKit开发仪表板，并在无法使用锚标签的情况下处理页面导航时遇到了问题。
为了阐明，我在我的仪表板上实现了一个“月份选择器”。我试图实现的功能是，每当用户选择一个月份时，他们会使用$app/navigation的goto函数被重定向到相应的页面。例如，如果用户当前位于/expenses/july路由，并通过月份选择器选择了“June”，则目标是将他们重定向到/expenses/june。
如预期的那样，这个重定向会触发页面的加载函数。然而，我在客户端端面临着一个令人困惑的问题，即没有检测到任何更改。
具体来说，尽管页面重定向，但export let data: PageData中封装的数据保持不变！尽管页面重定向，但没有看到任何更改。我正在尝试理解为什么会发生这种异常情况以及如何解决它。非常感谢任何见解或帮助。
英文:
I am in the process of developing a dashboard using SvelteKit and am encountering an issue with handling page navigation in scenarios where the use of an anchor tag is not possible.
To elucidate, I have a "month picker" implemented on my dashboard. The functionality I'm trying to achieve is such that whenever a user selects a month, they get redirected to the corresponding page using the goto function from $app/navigation. For instance, if a user is currently on the /expenses/july route and opts for 'June' via the month picker, the aim is to redirect them to /expenses/june.
As expected, this redirection triggers the load function of the page. However, I'm facing a perplexing issue on the client-side where no changes are detected.
Specifically, the data encapsulated in export let data: PageData remains constant! No alterations are discerned despite the page redirection. I'm trying to understand why this anomaly is occurring and how I can resolve it. Any insights or assistance would be greatly appreciated.
答案1
得分: 1
我现在明白了我的问题根源。看来我无意中使数据对象属性保持不变，这是因为我将它们分配给新变量的方式。例如，我是这样做的：
export let data: PageData;
let { year, month } = data;
$: console.log(month);
在这种设置中，console.log 仅在整个页面刷新时才会触发，而不是在每次导航事件发生时触发。
现在，我意识到我应该为我的年份和月份变量使用响应式声明，以确保它们在每次数据更改时都会更新，就像这样：
export let data: PageData;
let { year, month } = data;
$: ({ year, month } = data);
$: console.log(month);
这样做，响应式块将在每次数据更新时重新评估，确保年份和月份始终反映最新的值。
感谢您的帮助。
英文:
I now understand the root of my issue. It seems I was inadvertently maintaining the data object attributes as unchanging, due to the way I was assigning them to new variables. For example, this is how I was doing it:
export let data: PageData;
let { year, month } = data;
$: console.log(month);
In this setup, the console.log only gets triggered on a full page refresh, rather than upon every navigation event.
Now, I realize that I should have used a reactive declaration for my year and month variables to make sure they are updated every time data changes, like this:
export let data: PageData;
let { year, month } = data;
$: ({ year, month } = data);
$: console.log(month);
Doing so, the reactive block will be re-evaluated every time data is updated, ensuring year and month always reflect the most recent values.
Thank you for your help.
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