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Javascript根据select选项更改<p>内容

javascript select forms

Jammer · 技术社区 · 14 年前

Javascript不是最好的,所以我想我会问我哪里出错了。

<p> id为pricedesc的标记。这是我到目前为止的情况。

function priceText(sel)
{
    var listingType = document.getElementById('listingtype');
    var priceDesc = document.getElementById('pricedesc');
    if ( sel.options[sel.selectedIndex].value == "Residential Letting" ) {
    priceDesc = "Enter price per month";
    }
    else if ( sel.options[sel.selectedIndex].value == "Short Let" ) {
    priceDesc = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Serviced Accommodation" ) {
    priceDesc = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Sale" ) {
    priceDesc = "Enter for sale price";
    }

}

在我的身体里:

            <label>Listing Type:</label>
            <select name="listingtype" id="listingtype" onchange="priceText(this);">
                <option value="Residential Letting">Residential Letting</option>
                <option value="Short Let">Short Let</option>
                <option value="Serviced Accommodation">Serviced Accommodation</option>
                <option value="Sale">Sale</option>
            </select>


            <label>Price:</label>
            <p id="pricedesc">Enter price</p>
            <input name="price" type="text" id="price" value="<%=Request.Form("price")%>" maxlength="10" />

谢谢你的帮助。

J。

3 回复 | 直到 14 年前

Gordon Gustafson 14 年前

更改段落内容的起始行

priceDesc = "Enter price per month";

到

priceDesc.innerHTML = "Enter price per month";

目前,您正在更改 priceDesc 变量以包含字符串而不是段落节点。设置 innerHTML 节点的属性更改其中包含的html:D

Mike Sherov 14 年前

function priceText(sel)
{
    var listingType = document.getElementById('listingtype');
    var priceDesc = document.getElementById('pricedesc');
    if ( sel.options[sel.selectedIndex].value == "Residential Letting" ) {
    priceDesc.innerHTML = "Enter price per month";
    }
    else if ( sel.options[sel.selectedIndex].value == "Short Let" ) {
    priceDesc.innerHTML = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Serviced Accommodation" ) {
    priceDesc.innerHTML = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Sale" ) {
    priceDesc.innerHTML = "Enter for sale price";
    }

}

您想设置innerHTML属性。

http://jquery.com/ ),因为它使这样的任务更简单。

gblazex 14 年前

顺便说一句,有一个误解:

function priceText(sel) // <- but why pass sel here??
{
    sel = document.getElementById('listingtype'); // <- when you select it here
    var priceDesc = document.getElementById('pricedesc');
    if ( sel.options[sel.selectedIndex].value == "Residential Letting" ) {
      priceDesc.innerHTML = "Enter price per month";
    }
    else if ( sel.options[sel.selectedIndex].value == "Short Let" ) {
      priceDesc.innerHTML = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Serviced Accommodation" ) {
      priceDesc.innerHTML = "Enter price per week";
    }
    else if ( sel.options[sel.selectedIndex].value == "Sale" ) {
      priceDesc.innerHTML = "Enter for sale price";
    }
}

Javascript根据select选项更改<p>内容

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