验证Gridview CheckBox检查多个GridView [英] Validate Gridview CheckBox Checked for Multiple Gridviews

问题描述

我想验证 Gridview CheckBox 检查了多个 Gridviews 在同一页面上

I want to validate Gridview CheckBox Checked for Multiple Gridviews on the same page

我尝试了以下方法，但无法正常工作。

I have tried the following but it is not working.

<script type="text/javascript">
    var TargetBaseControl = null;
    window.onload = function () {
        try {
            //get target base control.
            TargetBaseControl = document.getElementById('<%= this.GridView1.ClientID%>', '<%= this.GridView2.ClientID%>');
        }
        catch (err) {
            TargetBaseControl = null;
        }
    }
    function TestCheckBox() {
        if (TargetBaseControl == null) return false;
        //get target child control.
        var TargetChildControl = "chkSelectAdd";
        //get all the control of the type INPUT in the base control.
        var Inputs = TargetBaseControl.getElementsByTagName("input");
        for (var n = 0; n < Inputs.length; ++n)
            if (Inputs[n].type == 'checkbox' &&
            Inputs[n].id.indexOf(TargetChildControl, 0) >= 0 &&
            Inputs[n].checked)
                return true;
        alert('Select at least one checkbox!');
        return false;
    }
</script>

推荐答案

我可以在这里看到两个问题。 document.getElementById 一次只支持一个元素，所以你的代码只会检查第一个GridView的复选框。此外，一个元素的ID应该是唯一的，所以你在这里检查ID：

There are two problems that I can see here. document.getElementById only supports one element at a time, so your code will only check the first GridView's checkboxes. Also, an element's ID ought to be unique and so your check against the ID here:

Inputs[n].id.indexOf(TargetChildControl, 0) >= 0 &&

只会在第一个复选框中返回true。

will only return true for the first checkbox.

我建议删除 TargetBaseControl 的用法，而仅仅依靠复选框的名称而不是ID：

I'd suggest removing the use of TargetBaseControl and simply relying on the names, rather than IDs, of the checkboxes instead:

var Inputs = document.getElementsByTagName("input");
    for (var n = 0; n < Inputs.length; ++n)
        if (Inputs[n].type == 'checkbox' &&
        Inputs[n].name.indexOf(TargetChildControl, 0) >= 0 &&
        Inputs[n].checked)
            return true;
...

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