问如何获取XMLhttp responseText？
EN

Stack Overflow用户

提问于 2012-10-10 07:05:38

回答 1查看 478关注 0票数 1

我不太熟悉xmlhttp对象，尽管有可用的文档，但我在获取responseText时遇到了问题。我离你这么近了，但如果有人能指出为什么下面的代码不能工作，我会很感激的；在send()之后，它就死了……

function fetchgenotype() {
    // here's where we use an Ajax function to fetch the allele values without reloading the page.
    // Get the index number of the genotype record to retrieve; retrieve it; populate the alleles.
    var mndx, sndx = 0;
    mndx = $('#marker').val();
    if (Study_selected) {
        sndx = $('#stylabid').val();
    } else {
        sndx = $('#pjtlabid').val();
    }
    if (window.XMLHttpRequest) {
        // code for IE7+, Firefox, Chrome, Opera, Safari
        xmlhttp = new XMLHttpRequest();
    } else {
        // code for IE6, IE5
        xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
    xmlhttp.onreadystatechange = function () {
        if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
            // Recieve the return value, parse and assign to screen form. 
            var allele_stg = "";
            allele_stg = document.getElementById("allele_ary").innerHTML = xmlhttp.responseText;
            ary = new Array();
            ary = str_getcsv(allele_ary, ',');
            $('#allele_1_1').val() = ary[0];
            $('#allele_1_2').val() = ary[1];
        }
    }
    xmlhttp.open("GET", "fetchAlleles.php?mndx=" + mndx + "&sndx=" + sndx, true);
    xmlhttp.send();
} // end of fetchgenotype

javascript

回答 1

Stack Overflow用户

发布于 2012-10-10 07:35:39

您可以通过将if语句更改为：

if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
    // Receive the return value, parse and assign to screen form. 
    var allele_stg = "",
        rText = xmlhttp.responseText;
    /*
     * By assigning xmlhttp.responseText to a seperate variable
     * you can now check to make sure rText contains what you
     * expect to see.
     * 
     * By making the call to getElementById and assigning the
     * innerHTML property in separate statements, you can now
     * check to make sure that getElementById is returning a
     * DOM element, or if it's undefined.
     */
    allele_stg = document.getElementById("allele_ary");
    allele_stg.innerHTML = rText;
    ary = new Array();
    ary = str_getcsv(allele_ary, ',');
    $('#allele_1_1').val() = ary[0];
    $('#allele_1_2').val() = ary[1];
} else {
    console.log('xmlhttp.readyState:' + xmlhttp.readyState);
    console.log('xmlhttp.status:' + xmlhttp.status);
}

然后监控控制台。我怀疑你要么是得不到200 xmlhttp.status，要么是xmlhttp.readyState永远不会访问4。

票数 1

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原文链接：

https://stackoverflow.com/questions/12809680

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