HTML表单

时间:2018-08-30 09:29:56

标签: javascript html5

我正在尝试将用户范围滑块输入转换为HTML形式,然后调用Java函数以进一步执行。直到调用JavaScript函数为止,它都可以正常工作,但是默认情况下,它只考虑第一个if

如果范围滑块输入大于等于100,或者如果滑块输入小于100,我希望它执行if语句。

HTML代码

<tr height=40>
    <td width=40></td>
        <td>
        <form id="P1_pulsetime" oninput="">
            <br><br>
            10<input type="range" id="port1_pulseslider" min="10" max="120" value="20" onchange="pulserangevalueX.value=value"/>120
            <output id="pulserangevalueX">20</output>
            <br><br>
            <input type="button" onclick="Port1_pulsetime()" value="Port_1_pulse">
            <br><br>
        </form>
        </td>
    </tr>

JavaScript

function Port1_pulsetime(){
        if(connected_flag==1){
            client.subscribe("lazy/test");
            var P1_slider = document.getElementById("port1_pulseslider").value;
            var pulserangevalueX = document.getElementById("pulserangevalueX").value;

            if (pulserangevalueX >= '100') {
                message = new Paho.MQTT.Message("PULSE 1" + document.getElementById("port1_pulseslider").value);
                message.destinationName = "lazy/test";
                client.send(message);
                }
            else if (pulserangevalueX < '100') {
                message = new Paho.MQTT.Message("PULSE 10" + document.getElementById("port1_pulseslider").value);
                message.destinationName = "lazy/test";
                client.send(message);
                }
            }
        else {
            console.log("not connected")
            }
        return false;
    }

我认为有一些小错误无法捕捉。

1 个答案:

答案 0 :(得分:0)

尝试如下所示放置else,插入console.log()以查看是否输入else。

function Port1_pulsetime(){
    if(connected_flag==1){
        client.subscribe("lazy/test");
        var P1_slider = document.getElementById("port1_pulseslider").value;
        var pulserangevalueX = document.getElementById("pulserangevalueX").value;

        if (pulserangevalueX >= '100') {
            message = new Paho.MQTT.Message("PULSE 1" + document.getElementById("port1_pulseslider").value);
            message.destinationName = "lazy/test";
            client.send(message);
            }
        else if (pulserangevalueX < '100') {
            message = new Paho.MQTT.Message("PULSE 10" + document.getElementById("port1_pulseslider").value);
            message.destinationName = "lazy/test";
            client.send(message);
            } //INSERT ELSE HERE
              else {
              // INSERT CONSOLE LOG HERE
            }
        }
    else {
        console.log("not connected")
        }
    return false;
}