载入编号为1到20的asp下拉列表 [英] Load asp dropdown list with numbers 1 - 20
本文介绍了载入编号为1到20的asp下拉列表的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个称为ASP的下拉列表,我需要加载1到20的数字,默认情况下选择1.如何使用javascript做到这一点?我有一个示例代码,但下拉列表未加载.我想念什么吗?
I have an ASP drop down list called and I need to load numbers 1 to 20 with 1 being selected as default. How to do this with javascript? I have a sample code but the drop down is not loading. Am I missing something?
<script>
function quantitydropdown() {
var ddl = document.getElementById('quantitydropdownid').getElementsByTagName("select")[0];
for (var i = 1; i <= 100; i++) {
var theOption = new Option;
theOption.text = i;
theOption.value = i;
ddl.options[i] = theOption;
}
}
</script>
<select id="quantitydropdownid" onchange="javascript:quantitydropdown();" runat="server" style="width: 200px;"></select>
推荐答案
因此,当文档准备就绪时,我们将填充下拉列表:
So, when the document is ready, we populate the drop down:
// Set up event handler for when document is ready
window.addEventListener("DOMContentLoaded", function(){
// Get reference to drop down
var ddl = document.getElementById('quantitydropdownid');
for (var i = 1; i < 21; i++) {
var theOption = document.createElement("option");
theOption.text = i;
theOption.value = i;
// If it is the first option, make it be selected
i === 1 ? theOption.selected = "selected" : "";
ddl.options[i] = theOption;
}
});
#quantitydropdownid { width:200px; }
<select id="quantitydropdownid" runat="server"></select>
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