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我正在嘗試遍歷一段XML來爲Web應用程序提取一些邏輯規則。我設法讓我的JavaScript可以在Firefox,Chrome,Opera和Safari上運行,但是我在MS瀏覽器中收到了控制檯錯誤,指出'無法獲取未定義的屬性'length'或空引用''。Internet Explorer/MS Edge瀏覽器問題遍歷xml數據
我無法通過反覆試驗獲得解決方案,因爲錯誤很早出現在代碼中。
我的Javascript的示例;
function conditionTrigger(id, callType) {
var parser = new DOMParser(),
xmlLogic = parser.parseFromString(configXML, "text/xml"),
tags = xmlLogic.getElementsByTagName('*'),
conditionsPassed = 0,
callType;
if (id.length >= 3) {
id = id.slice(3);
}
console.log(tags[0]);
console.log(tags[0].children.length);
console.log('ID to be checked against = ' + id);
console.log(tags.length + ' nodes.');
console.log(tags[0].children.length + ' level 1 node children.');
for(var i01 = 0; i01 < tags[0].children.length; i01++){
console.log(tags[0].children[i01]);
if (tags[0].children[i01].nodeName == "Rules"){
console.log(tags[0].children[i01].children.length + ' child nodes of ' +tags[0].children[i01].nodeName + '.');
for(var i02 = 0; i02 < tags[0].children[i01].children.length; i02++){
console.log(tags[0].children[i01].children[i02]);
}
}
}
}
我的xml低於;
<?xml version="1.0" encoding="utf-8" ?>
<output brand="[BRANDNAME]" title="[SCRIPTNAME]" version ="[SCRIPTVERSION]">
<Rules>
<block id="1000000" triggerID="14">
<ConditionsAndActions name="Test for something else" setIndex="2">
<Conditions>
<Condition type="DataField" fieldID="6" value="xxx" />
</Conditions>
<Actions>
<Action actionIndex="0" type="DisplayAlert" message="can't move on, xxx found"/>
</Actions>
</ConditionsAndActions>
<ConditionsAndActions name="Check if forename is 'test' and call is a callback" setIndex="1">
<Conditions>
<Condition type="DataField" fieldID="6" value="test" />
<Condition type="Callback" />
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="27"/>
<Action actionIndex="0" type="DisplayAlert" message="Aha, this is a callback!"/>
</Actions>
</ConditionsAndActions>
<ConditionsAndActions name="Default" setIndex="0">
<Conditions>
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="17"/>
</Actions>
</ConditionsAndActions>
</block>
<block id="1000001" triggerID="19">
<ConditionsAndActions name="Default" setIndex="0">
<Conditions>
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="18"/>
</Actions>
</ConditionsAndActions>
</block>
<block id="1000002" triggerID="20">
<ConditionsAndActions name="Default" setIndex="0">
<Conditions>
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="10"/>
</Actions>
</ConditionsAndActions>
</block>
<block id="1000003" triggerID="22">
<ConditionsAndActions name="Default" setIndex="0">
<Conditions>
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="10"/>
</Actions>
</ConditionsAndActions>
</block>
<block id="1000004" triggerID="23">
<ConditionsAndActions name="Default" setIndex="0">
<Conditions>
</Conditions>
<Actions>
<Action actionIndex="0" type="MoveToPanel" panelID="17"/>
</Actions>
</ConditionsAndActions>
</block>
</Rules>
</output>
你能確定你的XML,你正在尋找的元素呢?從'getElementsByTagName('*')開始''看起來像是一種奇怪的訪問數據的方式,因爲它選擇所有元素。如果你想使用'tags [0]'來訪問根元素,我只需使用'xmlLogic.documentElement'。從那時起,我不確定你想訪問哪些元素,但我確定'querySelector(All)'和'getElementsByTagName'允許你指定你想要的元素的類型。 –
此外,Stackoverflow允許您以可執行的方式插入HTML和Javascript代碼片段,可測試的方式,考慮在您的問題中插入片段,我們可以在IE或Edge中檢查並測試以確定問題。 –
這些元素會隨着xml爲Web應用程序攜帶配置而變化 - 基本上,在這種情況下,用戶單擊按鈕將傳入一個ID並且JS需要遍歷xml以找出與該id相關的條件和操作,如果滿足所有條件,則執行setIndex值最高的那個值,如果未滿足條件集,則會觸發defsult(setIndex = 0)並且其相關的actiobs將會觸發 –