Greasemonkey（使用waitForKeyElements实用程序） - 如何在屏幕上显示特定元素后调用函数 [英] Greasemonkey (using the waitForKeyElements utility) - how to call a function after a specific element has been displayed on screen

问题描述

（继续我的这个问题）。< br>
我一直在写此用户说明。

打开乐队页面时（示例）您登陆DISCOGRAPHY>完整的离体记录。

我的脚本适用于DISCOGRAPHY选项卡

及其子标签（COMPLETE DISCOGRAPHY，MAIN，LIVES，DEMOS，MISC）：

它将评论列分成两部分并使表格可排序。

(In continuance to this question of mine).
I've been writing this userscript for the site metal-archives.com.
When opening a band page (example) you land to DISCOGRAPHY>COMPLETE DISCOGRAPHY.
My script applies to that DISCOGRAPHY tab
and it's sub-tabs (COMPLETE DISCOGRAPHY, MAIN, LIVES, DEMOS, MISC) :
it splits the column "Reviews" in two and makes the table sortable.

我最初想要（在我的脚本中使用 waitForKeyElements 实用程序在greasemonkey中）

a函数（根据内容添加一个列， appendColumn（x））

在之后被称为 DISCOGRAPHY> COMPLETE DISCOGRAPHY中的表格已经完全显示（我认为这是：在表格的最后一个标题显示之后）。

id 该表的最后一个标题（MISC。）的值已存储在此数组位置： myArray [end]

I want initially (using the waitForKeyElements utility in my script in greasemonkey)
a function (which adds a column to the table, based on it's contents, appendColumn(x) )
to be called after the table inside DISCOGRAPHY > COMPLETE DISCOGRAPHY has been completely displayed (I think this as: after the last header of the table has been displayed).
The id value of the last header of that table (MISC.) is already stored in this array position: myArray[end]

所以，到目前为止我失败的尝试（基于这个答案） 用户Brock Adams在我的初始问题中建议的）是以下变体：

So, my failed tries so far (based on this answer that user Brock Adams kindly suggested in my initial question) are variants of:

function appendColumn(x){....}

function triggerCall(jNode) {   
       appendColumn(0);    or --> jNode.appendColumn(0);   
   }

waitForKeyElements (myArray[end], triggerCall);  // no parentheses after triggerCall

推荐答案

假设 appendColumn 函数在重新加载时有效;然后你会稍微重写它并从waitForKeyElements（）调用它。

Assuming the appendColumn function works, as is, on reloads; then you would rewrite it slightly and call it from waitForKeyElements().

你不需要大部分的rigamorole，只需使用类名显示选择器的和 discog 。像这样：

You don't need most of that rigamorole, just use class names display and discog for the selector. Like so:

waitForKeyElements (".display.discog", appendColumn);

function appendColumn(jNode) {
    var tbl = jNode[0]; // table reference
    var i;
    var newCell, newText;    

    var tr = tbl.tHead.children[0],
    th = document.createElement('th');
    // THE REST OF THE FUNCTION IS THE SAME...
    //...

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