复选框检查asp.net中的客户端脚本 [英] checkbox checked client script in asp.net

问题描述

我有动态复选框和下拉框。



在此我需要编写客户端脚本来隐藏和显示下拉框。



i strucked.can任何人让我摆脱这个问题

i have dynamic check box and dropdown boxes.

in this i need to write client side script to hide and visible of dropdown box.

i strucked.can any one make me out of this issue

protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            try
            {
                DataSet ds = objConfig.GetPositions();
                for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
                {
                    HtmlTableRow tr = new HtmlTableRow();
                    HtmlTableCell tc = new HtmlTableCell();
                    tc.Align = "Left";
                    CheckBox _checkbox = new CheckBox();
                    DropDownList _DropDown = new DropDownList();
                   
                    _checkbox.ID = "chk_" + ds.Tables[0].Rows[i]["Widget_ID"].ToString();
                    _checkbox.Text = ds.Tables[0].Rows[i]["Widget_Name"].ToString();
                    
                    
                    _DropDown.ID = "ddl_" + ds.Tables[0].Rows[i]["Widget_ID"].ToString();
                    _DropDown.DataSource = ds;
                    _DropDown.DataValueField = "Widget_ID";
                    _DropDown.DataTextField = "Widget_ID";
                    _DropDown.DataBind();

                    _DropDown.Style.Add("display", "none");


                    ///////////////////////
		 //everything is working fine except below code
                    String scriptText = "";
                    scriptText += "function TogglePositionDDL(ctrl){";
                    scriptText += "   spanCounter.innerText = " +
                        " document.forms[0]._checkbox.value.length";
                    scriptText += "}";
                    ClientScript.RegisterClientScriptBlock(this.GetType(), "CounterScript", scriptText, true);
                   _checkbox.Attributes.Add("onchecked", "TogglePositionDDL()");

                    /////////////////////////

                    tc.Controls.Add(_checkbox);
                    tr.Cells.Add(tc);
                    HtmlTableCell tc1 = new HtmlTableCell();
                    tc1.Align = "Left";
                    tc1.Controls.Add(_DropDown);
                    tr.Cells.Add(tc1);
                    tblWidgets.Rows.Add(tr);
                }
		}
 }               }

推荐答案

问题

没有像这样的事件onchecked 。



解决方案

您应该使用 onclick 事件。

关注 - JavaScript Checkbox对象：onclick事件处理程序 [ ^ ]示例。

Problem
There is no event like onchecked.

Solution
You should use onclick event.
Follow - JavaScript Checkbox Object : onclick Event handler[^] for the example.

 ///////////////////////

working code
                    String scriptText = "";
                    scriptText = "function ToggleDDL(chk, ddl) {  if (chk.checked) { ddl.style.display='';   } else { ddl.style.display='none'; }}";
                    
                    ClientScript.RegisterClientScriptBlock(this.GetType(), "CounterScript", scriptText, true);
                    _checkbox.Attributes.Add("onclick", "ToggleDDL(ctl00_Mdi_" + _checkbox.ID + ", ctl00_Mdi_" + _DropDown.ID + ")");

                    /////////////////////////

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