javascript 如何知道 JqGrid 多选“全选”复选框被选中
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how to know JqGrid multiselect 'select all' checkbox is checked
提问by Baby
Im trying to display the selected row in JQgrid. Now, i have this code:
我试图在 JQgrid 中显示选定的行。现在，我有这个代码：
onSelectRow:function(rowid){
var selectedRow = $('#mygrid').jqGrid('getGridParam', 'selarrrow');
$("#totalSelected").val(selectedRow .length);
}
Its work fine, but then when the 'select all' checkbox is checked, it didn't trigger this code, eventhough in visual we can see that all row has been selected.
它的工作正常，但是当检查“选择所有”复选框时，它没有触发此代码，Visual中的EventHough我们可以看到已选择所有行。
so i'm thinking that if i know that the 'select all' checkbox is checked, i can set the total selected value like this:
所以我在想，如果我知道“全选”复选框被选中，我可以像这样设置总选定值：
if(//selectall checkbox is checked)
$("#totalSelected").val($("#mygrid tr").length-1);
I've tried this code by refering to this answer, but im pretty sure .checked() is not recognized:
我已经通过参考这个答案尝试了这段代码，但我很确定 .checked() 不被识别：
if($("#cb_mygrid"[0].id).checked())
$("#totalSelected").val($("#mygrid tr").length-1);
Any idea is much appreciated
任何想法都非常感谢
回答by Brian Swift
onSelectRow does not fire when the header checkbox is used to select all items. There is a separate event handler to capture the Select All event. From the documentation:
当标题复选框用于选择所有项目时，onSelectRow 不会触发。有一个单独的事件处理程序来捕获 Select All 事件。从文档：
onSelectAll
全选
Sends you the following parameters: aRowids, status
向您发送以下参数：aRowids、状态
This event fires when multiselect option is true and you click on the header checkbox. aRowids is an array of the selected rows (rowid's). status is a boolean variable determining the status of the header check box - true if checked, false if not checked. Note that the aRowids array will always contain the ids whether the header checkbox is checked or unchecked.
当多选选项为 true 并且您单击标题复选框时会触发此事件。aRowids 是选定行（rowid's）的数组。status 是一个布尔变量，用于确定标题复选框的状态 - 如果选中则为 true，如果未选中则为 false。请注意，无论是否选中标题复选框，aRowids 数组都将始终包含 id。
When this event fires, in your case you'll want to do the following to show the correct count of selected rows:
当此事件触发时，在您的情况下，您需要执行以下操作以显示所选行的正确计数：
onSelectAll: function(aRowids, status) {
//Use a ternary operator to choose zero if the header has just been unchecked, or the total items if it has just been checked.
$("#totalSelected").val(status === false ? 0 : aRowids.length);
}
