如何获取下拉列表中的下拉值 [英] How to get dropdown value on dropdown bind

问题描述

使用ajax绑定下拉列表。 iam在使用所选事件的下拉绑定中设置默认值。如果下拉列表完成绑定。我想在默认情况下获得选定的值。和iam更改另一个下拉列表，在页面加载时使用此默认值







感谢问候



我尝试过：



函数addSelect（divname，columname，defaultvalue ，dropid，tablename，pd，userid，chartid，filte）{

var newDiv = document.createElement（pd）;

var change =onchange ='dropchange（this ）'';

var html ='< select'+ change +'title ='+ defaultvalue +'id ='+ dropid +'name ='+ columname +' >'

var obj = {};

obj.coluname = columname;

obj.tablename = tablename;

obj.userid = userid;

obj.chartid = chartid;

obj.filte = filte;

$ .ajax（ {

url：webmethod.aspx / dropdownbine，

数据：JSON.stringify（obj），

dataType：json，

类型：POST，

contentType：application / json; charset = utf-8，

成功：功能（r）{



var result = rd;

var sel =All;

var selected =true;

html + =< option Value ='+ sel +'title =' + defaultvalue +'>+ sel +< / option>;

for（i = 0; i< result.length; i ++）

{

if（defaultvalue == result [i]）

{

html + =< option selected ='+ selected +'value ='+ result [i] +'>+ result [i] +< / option>;

}

else {

html + =< option value ='+ result [i] +'>+ result [i] +< / option>;

}

}

html + ='< / select>';

newDiv.innerHTML = html;

document.getElementById（divname）.appendChild（newDiv）;



}，

错误：函数（XMLHttpRequest，textStatus，errorThrown）{

alert（'得到错误下拉列表绑定'）;

}

} ）;



}











var a = $ .trim（$（[id * = chart0Filter2drop0]）。val（））;

解决方案

.ajax（{

url：webmethod.aspx / dropdownbine，

数据：JSON.stringify（obj），

dataType：json，

类型：POST，

contentType：application / json; charset = utf-8，

成功：功能（r）{



var result = rd;

var sel =All;

var selected =true;

html + =< option Value ='+ sel +'title =' + defaultvalue +'>+ sel +< / option>;

for（i = 0; i< result.length; i ++）

{

if（defaultvalue == result [i]）

{

html + =< option selected ='+ selected +'value ='+ result [i] +'>+ result [i] +< / option>;

}

else {

html + =< option value ='+ result [i] +'>+ result [i] +< / option>;

}

}

html + ='< / select>';

newDiv.innerHTML = html;

document.getElementById（divname）.appendChild（newDiv）;



}，

错误：函数（XMLHttpRequest，textStatus，errorThrown）{

alert（'得到错误下拉列表绑定'）;

}

} ）;



}











var a =

.trim（

（[id * = chart0Filter2drop0]）VAL（））;

iam binding the dropdown using ajax. iam set default value on dropdown bind useing selected event. if dropdown complete the bind. i want to get selected value on default. and iam change another dropdown to use of this default value on page load



thanks Regards

What I have tried:

function addSelect(divname, columname, defaultvalue,dropid, tablename, pd, userid, chartid, filte) {
var newDiv = document.createElement(pd);
var change = " onchange='dropchange(this)' ";
var html = '<select ' + change + ' title="' + defaultvalue + '" id="' + dropid + '" name = "' + columname + '" >'
var obj = {};
obj.coluname = columname;
obj.tablename = tablename;
obj.userid = userid;
obj.chartid = chartid;
obj.filte = filte;
$.ajax({
url: "webmethod.aspx/dropdownbine",
data: JSON.stringify(obj),
dataType: "json",
type: "POST",
contentType: "application/json; charset=utf-8",
success: function(r) {

var result = r.d;
var sel = "All";
var selected="true";
html += "<option Value='" + sel + "' title ='" + defaultvalue + "'>" + sel + "</option>";
for (i = 0; i < result.length; i++)
{
if(defaultvalue==result[i])
{
html += "<option selected='" + selected + "' value='" + result[i] + "'>" + result[i] + "</option>";
}
else {
html += "<option value='" + result[i] + "'>" + result[i] + "</option>";
}
}
html += '</select>';
newDiv.innerHTML = html;
document.getElementById(divname).appendChild(newDiv);

},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert('Got an Error Dropdownlist bind ');
}
});

}





var a =$.trim($("[id*=chart0Filter2drop0]").val());

解决方案

.ajax({
url: "webmethod.aspx/dropdownbine",
data: JSON.stringify(obj),
dataType: "json",
type: "POST",
contentType: "application/json; charset=utf-8",
success: function(r) {

var result = r.d;
var sel = "All";
var selected="true";
html += "<option Value='" + sel + "' title ='" + defaultvalue + "'>" + sel + "</option>";
for (i = 0; i < result.length; i++)
{
if(defaultvalue==result[i])
{
html += "<option selected='" + selected + "' value='" + result[i] + "'>" + result[i] + "</option>";
}
else {
html += "<option value='" + result[i] + "'>" + result[i] + "</option>";
}
}
html += '</select>';
newDiv.innerHTML = html;
document.getElementById(divname).appendChild(newDiv);

},
error: function(XMLHttpRequest, textStatus, errorThrown) {
alert('Got an Error Dropdownlist bind ');
}
});

}





var a =

.trim(

("[id*=chart0Filter2drop0]").val());

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