JavaScript-焦点事件停止计时器
我有一个脚本,每2秒更改文本框中的文本。我想让它停止(计时器)并在用户单击并关注文本框时清除文本框JavaScript-焦点事件停止计时器,javascript,Javascript,我有一个脚本,每2秒更改文本框中的文本。我想让它停止(计时器)并在用户单击并关注文本框时清除文本框 var text = ["1", " 2", "3"]; var counter = 0; var elem = document.getElementById("txt1"); setInterval(change, 2000); function change() { document.getElementById("txt1").value = text[counter]; //data
var text = ["1", " 2", "3"];
var counter = 0;
var elem = document.getElementById("txt1");
setInterval(change, 2000);
function change() {
document.getElementById("txt1").value = text[counter]; //data is the element
counter++;
if(counter >= text.length) {
counter = 0;
}
}
更新您的输入类型,如
<input type="text" onfocus="myFunction()">
到
在脚本中添加myFunction
function myFunction(){
clearInterval(tt);
document.getElementById("txt1").value = "";
}
试试这个:
//当你设定时间间隔时
区间\变量=设定区间(变更,2000年)
//当您要停止执行“更改”时
clearInterval(interval_变量) 调用
setInterval()时存储间隔id
:
然后在focus()
处理程序中取消它:
function stopit()
{
if (interval) {
clearInterval(interval);
interval = false;
elem.value = "";
}
}
if (elem.addEventListener) {
elem.addEventListener('focus', stopit, false);
} else if (elem.attachEvent) {
elem.attachEvent('onfocus', stopit);
}
请注意,stopit()
只清除间隔(和文本)一次——这样,如果用户键入内容,在别处聚焦,然后重新聚焦,我们不会放弃他们的输入
示例:真正简单的解决方案是只检查输入是否在函数中有焦点,并且
document.activeElement
保存焦点元素,因此只需将其与elem
进行比较并返回它们是否相同即可
var text = ["I want a smartphone with a big screen", "I don't want a smartphone made by a korean company", "I want a LED TV with high refresh rate"];
var counter = 0;
var elem = document.getElementById("txt1");
elem.addEventListener('focus', function() {this.value=''}, false);
setInterval(change, 2000);
function change() {
if (document.activeElement == elem) return;
elem.value = text[counter];
counter++;
if(counter >= text.length) { counter = 0; }
}
示例2,在调用
clearInterval(tt)
后,调用document.getElementById(“txt1”).value=“”代码>谢谢回答!谢谢回答:)
var interval = setInterval(change, 2000);
function stopit()
{
if (interval) {
clearInterval(interval);
interval = false;
elem.value = "";
}
}
if (elem.addEventListener) {
elem.addEventListener('focus', stopit, false);
} else if (elem.attachEvent) {
elem.attachEvent('onfocus', stopit);
}
var text = ["I want a smartphone with a big screen", "I don't want a smartphone made by a korean company", "I want a LED TV with high refresh rate"];
var counter = 0;
var elem = document.getElementById("txt1");
elem.addEventListener('focus', function() {this.value=''}, false);
setInterval(change, 2000);
function change() {
if (document.activeElement == elem) return;
elem.value = text[counter];
counter++;
if(counter >= text.length) { counter = 0; }
}