如何使用Javascript触发按钮按下 [英] How to trigger unpress on a button using Javascript

问题描述

任何人都可以告诉我如何触发提交"按钮上的取消按下事件

Can anybody please tell me how to trigger unpress event on Submit button

如果有任何字段为空，我正在按按钮进行验证.我正在阻止导航到第二页.但是，在验证之后以及发件人"或到"字段为空后，提交"按钮仍保持按下状态. 在此处输入代码

I am doing a validation on button press if any of the fields are empty . i am preventing th e navigation to second page. But the Submit button remains pressed after validation and if From or To field is left empty. enter code here

        <form action="NewFile.html">
            From:<input id="from" type="text" name="From-busstop">
            To:<input id= "to" type="text" name="To-busstop">
            How do you want to travel?:<Select id="how" name="How">
              <option>Minimum Number of Hops</option>
            <option>Maximum Bus Route Availability</option>
            <option>Via Terminal Bus Stations Only</option>
            <option>Direct Routes Only</option>
            <option>Shortest Distance</option>
            </Select>
            <p>
            <a href="#two" id="submit" data-direction="reverse" data-role="button" data-transition="flip" onClick="loadpage()"
                >Submit"</a>
        </p>
        </form>
        <script type="text/javascript">
        $('#submit').on('click',function(e) {
            var from = document.getElementById('from').value;
            var to = document.getElementById('to').value;
            var how = document.getElementById('how').value;

            if(from.length < 1)
            {
                alert("From bus-stop is empty");
                document.getElementById("from").focus();
                e.preventDefault();
            }
            else if(to.length < 1)
            {
                alert("To bus-stop is empty");
                document.getElementById("to").focus();
                e.preventDefault();
            }
        });
        </script>

推荐答案

更改

else if(to.length < 1)

仅

if(to.length < 1)

---

您想执行两个if条件，不是吗?

---

You want to do two if-conditions, don't you?

如果是，则不需要 else

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