检查标签值更改 [英] Check label value change
问题描述
<label id="error_msg"></label>
现在,我想提醒一个消息,请填写文本框,每当有价值变化的 error_msg
Now, I want to alert a message that please fill text-box, whenever there is change in value of error_msg
此外,我想检查标签是否为空。如果标签为空,那么提醒不应该出现。
Also, I want to check whether label is empty or not. If label is empty, then alert should not come.
我写了代码,但它不起作用
I wrote the code, but it's not working somehow
$("#error_msg").change(function () {
alert('hi');
});
帮助家伙。
推荐答案
您需要监控标签的Dom更改。在 http://james.padolsey.com/javascript上查看易于使用的jQuery插件/ monitoring-dom-properties /
You need to monitor Dom changes for label. Check out the easy to use jQuery plugin at http://james.padolsey.com/javascript/monitoring-dom-properties/
如果您尝试验证,我强烈建议使用验证插件 http://bassistance.de/jquery-plugins/jquery-plugin-validation/
If you are trying to validate, i highly suggest using the validation plugin http://bassistance.de/jquery-plugins/jquery-plugin-validation/
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